Copyright © 2014 Nordic Semiconductor ASA. All rights reserved.
Reproduction in whole or in part is prohibited without the prior written permission of the copyright holder.
nRF51422
Multiprotocol ANT™/Bluetooth® low energy System on Chip
Product Specification v3.2
Key Features
•2.4 GHz transceiver
• -90 dBm sensitivity in ANT mode
• -93 dBm sensitivity in Bluetooth® low energy mode
• 250 kbps, 1 Mbps, 2 Mbps supported data rates
• TX Power -20 to +4 dBm in 4 dB steps
• TX Power -30 dBm Whisper mode
• 13 mA peak RX, 10.5 mA peak TX (0 dBm)
• 9.7 mA peak RX, 8 mA peak TX (0 dBm) with DC/DC
• RSSI (1 dB resolution)
• ARM® Cortex™-M0 32 bit processor
• 275 µA/MHz running from flash memory
• 150 µA/MHz running from RAM
• Serial Wire Debug (SWD)
• S200 and S300 series SoftDevice ready
•Memory
• 256 kB or 128 kB embedded flash program memory
• 16 kB or 32 kB RAM
• On-air compatibility with nRF24L series
• Flexible Power Management
• Supply voltage range 1.8 V to 3.6 V
• 4.2 µs wake-up using 16 MHz RCOSC
• 0.6 µA at 3 V OFF mode
• 1.2 µA at 3 V in OFF mode + 1 region RAM retention
• 2.6 µA at 3 V ON mode, all blocks IDLE
• 8/9/10 bit ADC - 8 configurable channels
• 31 General Purpose I/O Pins
• One 32 bit and two 16 bit timers with counter mode
•SPI Master/Slave
• Low power comparator
• Temperature sensor
• Two-wire Master (I2C compatible)
•UART (CTS/RTS)
• CPU independent Programmable Peripheral Interconnect (PPI)
• Quadrature Decoder (QDEC)
• AES HW encryption
• Real Timer Counter (RTC)
• Package variants
• QFN48 package, 6 x 6 mm
• WLCSP package, 3.50 x 3.83 mm
• WLCSP package, 3.83 x 3.83 mm
• WLCSP package, 3.50 x 3.33 mm
Applications
• Personal Area Networks
• Health/fitness sensor and monitor
devices
• Medical devices
• Key-fobs + wrist watches
• Remote control toys
• Home/industrial automation
• Environmental sensor networks
•Active RFID
• Logistics/goods tracking
• Audience-response systems
• Interactive entertainment devices
•Remote control
•Gaming controller
Page 2
nRF51422 Product Specification v3.2
Liability disclaimer
Nordic Semiconductor ASA reserves the right to make changes without further notice to the product to
improve reliability, function or design. Nordic Semiconductor ASA does not assume any liability arising out
of the application or use of any product or circuits described herein.
Life support applications
Nordic Semiconductor’s products are not designed for use in life support appliances, devices, or systems
where malfunction of these products can reasonably be expected to result in personal injury. Nordic
Semiconductor ASA customers using or selling these products for use in such applications do so at their
own risk and agree to fully indemnify Nordic Semiconductor ASA for any damages resulting from such
improper use or sale.
Contact details
For your nearest distributor, please visit www.nordicsemi.com.
Information regarding product updates, downloads, and technical support can be accessed through your
My Page account on our home page.
RoHS and REACH statement
Nordic Semiconductor's products meet the requirements of Directive 2002/95/EC of the European
Parliament and of the Council on the Restriction of Hazardous Substances (RoHS) and the requirements of
the REACH regulation (EC 1907/2006) on Registration, Evaluation, Authorization and Restriction of
Chemicals. The SVHC (Substances of Very High Concern) candidate list is continually being updated.
Complete hazardous substance reports, material composition reports and latest version of Nordic's REACH
statement can be found on our website www.nordicsemi.com.
Main office:
Phone: +47 72 89 89 00
Fax: +47 72 89 89 89
Otto Nielsens veg 12
7052 Trondheim
Norway
Mailing address: Nordic Semiconductor
P.O. Box 2336
7004 Trondheim
Norway
Page 3
nRF51422 Product Specification v3.2
Datasheet Status
Revision History
Status Description
Objective Product Specification (OPS) This product specification contains target specifications for product
development.
Preliminary Product Specification (PPS) This product specification contains preliminary data; supplementary data
may be published from Nordic Semiconductor ASA later.
Product Specification (PS)
This product specification contains final product specifications. Nordic
Semiconductor ASA reserves the right to make changes at any time
without notice in order to improve design and supply the best possible
product.
Date Version Description
January 2016 3.2 Added content:
•Section 4.10.1 “Enable 4 Mbps SPIS bit rate” on page 34
Updated content:
• Feature list on the front page.
•Chapter 6 “Absolute maximum ratings” on page 37
•Section 8.1.2 “16 MHz crystal oscillator (16M XOSC)” on page 40
•Section 8.1.5 “32.768 kHz crystal oscillator (32k XOSC)” on page 42
•Section 8.1.6 “32.768 kHz RC oscillator (32k RCOSC)” on page 43
•Section 8.2 “Power management” on page 44
•Section 8.8 “Serial Peripheral Interface Slave (SPIS) specifications” on page 56
October 2014 3.1 Added documentation for the following versions of the chip:
• nRF51422-CDAB AA0
• nRF51422-CDAB Ax0
• nRF51422-QFAC AB0
• nRF51422-QFAC Ax0
• nRF51422-CFAC AA0
• nRF51422-CFAC Ax0
(The x in the build codes can be any number between 0 and 9.)
Added content:
•Section 2.2.2 “CDAB WLCSP ball assignment and functions” on page 13
•Section 9.2 “CDAB WLCSP package” on page 67
•Section 9.4 “CFAC WLCSP package” on page 69
Updated content:
• Feature list on the front page.
•Section 2.2.3 “CEAA and CFAC WLCSP ball assignment and functions” on page 18
•Section 3.2.1 “Code organization” on page 21
•Section 3.2.2 “RAM organization” on page 21
•Section 3.3 “Memory Protection Unit (MPU)” on page 22
•Section 8.2 “Power management” on page 44
•Section 8.3 “Block resource requirements” on page 48
•Section 8.12 “Analog to Digital Converter (ADC) specifications” on page 60
•Section 10.6 “Code ranges and values” on page 73
•Section 10.7 “Product options” on page 75
•
Page 4
nRF51422 Product Specification v3.2
August 2014 3.0 Update to reflect the changes in build code:
• nRF51422-QFAA Fx0
• nRF51422-CEAA Cx0
• nRF51422-QFAB Bx0
(The x in the build codes can be any number between 0 and 9.)
If you are working with a previous revision of the chip, read version 2.x of the document.
Added content:
•Section 8.5.3 “Radio current consumption with DC/DC enabled” on page 50
•Section 11.1.1 “PCB layout example” on page 77
Updated content:
• Feature list on the front page.
•Section 2.1 “Block diagram” on page 10
•Section 3.2.1 “Code organization” on page 21
•Section 3.2.2 “RAM organization” on page 21
•Section 3.3 “Memory Protection Unit (MPU)” on page 22
•Section 3.4 “Power management (POWER)” on page 23
•Section 3.6 “Clock management (CLOCK)” on page 27
•Section 3.8 “Debugger support” on page 30
•Section 4.2 “Timer/counters (TIMER)” on page 32
•Chapter 5 “Instance table” on page 36
•Chapter 7 “Operating conditions” on page 38
•Section 8.1.2 “16 MHz crystal oscillator (16M XOSC)” on page 40
•Section 8.1.3 “32 MHz crystal oscillator (32M XOSC)” on page 41
•Section 8.1.4 “16 MHz RC oscillator (16M RCOSC)” on page 42
•Section 8.1.6 “32.768 kHz RC oscillator (32k RCOSC)” on page 43
•Section 8.1.7 “32.768 kHz Synthesized oscillator (32k SYNT)” on page 43
•Section 8.2 “Power management” on page 44
•Section 8.3 “Block resource requirements” on page 48
•Section 8.4 “CPU” on page 48
•Section 8.5.6 “Radio timing parameters” on page 54
•Section 8.5.7 “Antenna matching network requirements” on page 54
•Section 8.7 “Universal Asynchronous Receiver/Transmitter (UART) specifications”
on page 55
•Section 8.8 “Serial Peripheral Interface Slave (SPIS) specifications” on page 56
•Section 8.12 “Analog to Digital Converter (ADC) specifications” on page 60
•Section 8.13 “Timer (TIMER) specifications” on page 61
•Section 8.15 “Temperature sensor (TEMP)” on page 61
•Section 8.22 “Non-Volatile Memory Controller (NVMC) specifications” on page 64
•Section 8.24 “Low Power Comparator (LPCOMP) specifications” on page 65
•Section 9.2 “CDAB WLCSP package” on page 67
•Chapter 11 “Reference circuitry” on page 76
February 2014 2.1 Added content about the nRF51422-QFAB chip variant.
Updated content:
•Chapter 3.2.1 “Code organization” on page 21
•Chapter 3.2.2 “RAM organization” on page 21
•Chapter 3.3 “Memory Protection Unit (MPU)” on page 22
•Chapter 10.7.1 “nRF ICs” on page 75
•Chapter 11.3.1.1 “Bill of Materials” on page 80
•Chapter 11.3.2.1 “Bill of Materials” on page 82
•Chapter 11.3.3.1 “Bill of Materials” on page 84
Date Version Description
Page 5
nRF51422 Product Specification v3.2
December 2013 2.0 This version of the document will target the nRF51422 QFAA E0 revision and the
nRF51422 CEAA B0 revision of the chip. If you are working with a previous revision of the
chip, read version 1.2 or earlier of the document.
Added content:
•Section 3.3 “Memory Protection Unit (MPU)” on page 22
•Section 4.5 “AES CCM Mode Encryption (CCM)” on page 33
•Section 4.6 “Accelerated Address Resolver (AAR)” on page 33
•Section 4.16 “Low Power Comparator (LPCOMP)” on page 35
•Section 8.5.7 “Antenna matching network requirements” on page 54
•Section 8.8 “Serial Peripheral Interface Slave (SPIS) specifications” on page 56
•Section 8.18 “AES CCM Mode Encryption (CCM) specifications” on page 62
•Section 8.19 “Accelerated Address Resolver (AAR) specifications” on page 62
•Section 8.24 “Low Power Comparator (LPCOMP) specifications” on page 65
Updated content:
• Feature list on the Front page
•Chapter 1 “Introduction” on page 9
•Section 1.1 “Required reading” on page 9
•Section 2.1 “Block diagram” on page 10
•Section 2.2 “Pin assignments and functions” on page 11
•Section 3.2 “Memory” on page 20
•Section 3.5 “Programmable Peripheral Interconnect (PPI)” on page 26
•Section 3.7 “GPIO” on page 30
•Chapter 4 “Peripheral blocks” on page 31
•Section 4.1 “2.4 GHz radio (RADIO)” on page 31
•Section 4.2 “Timer/counters (TIMER)” on page 32
•Section 4.3 “Real Time Counter (RTC)” on page 32
•Section 4.10 “Serial Peripheral Interface (SPI/SPIS)” on page 34
•Section 4.12 “Universal Asynchronous Receiver/Transmitter (UART)” on page 35
•Section 4.14 “Analog to Digital Converter (ADC)” on page 35
•Section 4.15 “GPIO Task Event blocks (GPIOTE)” on page 35
•Chapter 5 “Instance table” on page 36
•Chapter 6 “Absolute maximum ratings” on page 37
•Section 8.1.2 “16 MHz crystal oscillator (16M XOSC)” on page 40
•Section 8.1.3 “32 MHz crystal oscillator (32M XOSC)” on page 41
•Section 8.1.5 “32.768 kHz crystal oscillator (32k XOSC)” on page 42
•Section 8.2 “Power management” on page 44
•Section 8.3 “Block resource requirements” on page 48
•Section 8.5.1 “General radio characteristics” on page 49
•Section 8.5.5 “Receiver specifications” on page 52
•Section 8.5.6 “Radio timing parameters” on page 54
•Section 8.7 “Universal Asynchronous Receiver/Transmitter (UART) specifications”
on page 55
•Section 8.9 “Serial Peripheral Interface (SPI) Master specifications” on page 57
•Section 8.11 “GPIO Tasks and Events (GPIOTE) specifications” on page 59
•Section 8.13 “Timer (TIMER) specifications” on page 61
•Section 8.16 “Random Number Generator (RNG) specifications” on page 62
•Chapter 10 “Ordering information” on page 70
•Section 11.1 “PCB guidelines” on page 76
•Section 11.3 “QFAA QFN48 package” on page 79
•Section 11.7 “CEAA WLCSP package” on page 103
Date Version Description
Page 6
nRF51422 Product Specification v3.2
April 2013 1.2 Added chip variant nRF51422-CEAA. Updated feature list on front page.
Updated
Section 3.2.1 on page 15, Section 3.2.2 on page 15, Chapter 6 on page 28,
Section 10.4 on page 52, and Section 10.5.1 on page 53.
Added
Section 2.2.2 on page 10, Section 7.1 on page 29, Section 9.2 on page 50,
and Section 11.3 on page 61.
Removed PCB layouts in Chapter 11 on page 54.
March 2013 1.1 Added 32 MHz crystal oscillator feature. Moved subsection ‘Calculating current when the
DC/DC converter is enabled’ from chapter 8 to the nRF51 Series Reference Manual.
Updated
Section 3.2 on page 12, Section 3.5 on page 16, Section 3.5.1 on page 17,
Section 4.2 on page 21, Chapter 5 on page 24, Section 8.1 on page 27,
Section 8.1.2 on page 28, Section 8.1.5 on page 30, Section 8.2 on page 32,
Section 8.3 on page 34, Section 8.5.3 on page 36, Section 8.8 on page 40,
Section 8.9 on page 41, Section 8.10 on page 42, and Section 8.14 on page 43.
Added
Section 3.5.4 on page 19, Section 8.1.3 on page 29, and Section 11.1 on page 50.
December 2012 1.0 Changed from PPS to PS. Updated the feature list on the front page.
Updated
Section 3.5.3 on page 18, Table 10 on page 24, Table 11 on page 25,
Table 12 on page 26, Table 14 on page 27, Table 15 on page 28,
Table 16 on page 28, Table 17 on page 29, Table 19 on page 30,
Table 20 on page 31, Table 22 on page 32, Table 23 on page 32,
Table 24 on page 33, Table 25 on page 35, Table 26 on page 36,
Table 28 on page 36, Table 29 on page 37, Table 30 on page 37,
Table 32 on page 38, Table 33 on page 38, Table 36 on page 39,
Section 8.16 on page 40, Table 39 on page 40, Table 40 on page 40,
Table 56 on page 47, and the reference design in Chapter 11 on page 48.
Added
Section 3.5.4 on page 19 and Table 18 on page 29.
Date Version Description
Page 7
nRF51422 Product Specification v3.2
Table of contents
1 Introduction............................................................................................................................................... 9
1.1 Required reading.............................................................................................................................................. 9
1.2 Writing conventions........................................................................................................................................ 9
2 Product overview.................................................................................................................................... 10
2.1 Block diagram .................................................................................................................................................10
2.2 Pin assignments and functions .................................................................................................................11
3 System blocks.......................................................................................................................................... 19
3.1 CPU ......................................................................................................................................................................19
3.2 Memory..............................................................................................................................................................20
3.3 Memory Protection Unit (MPU).................................................................................................................22
3.4 Power management (POWER)...................................................................................................................23
3.5 Programmable Peripheral Interconnect (PPI) ......................................................................................26
3.6 Clock management (CLOCK)......................................................................................................................27
3.7 GPIO.....................................................................................................................................................................30
3.8 Debugger support .........................................................................................................................................30
4 Peripheral blocks .................................................................................................................................... 31
4.1 2.4 GHz radio (RADIO)...................................................................................................................................31
4.2 Timer/counters (TIMER)................................................................................................................................32
4.3 Real Time Counter (RTC) ..............................................................................................................................32
4.4 AES Electronic Codebook Mode Encryption (ECB).............................................................................32
4.5 AES CCM Mode Encryption (CCM)............................................................................................................33
4.6 Accelerated Address Resolver (AAR) .......................................................................................................33
4.7 Random Number Generator (RNG)..........................................................................................................33
4.8 Watchdog Timer (WDT)................................................................................................................................33
4.9 Temperature sensor (TEMP) .......................................................................................................................34
4.10 Serial Peripheral Interface (SPI/SPIS) .......................................................................................................34
4.11 Two-wire interface (TWI)..............................................................................................................................34
4.12 Universal Asynchronous Receiver/Transmitter (UART) ....................................................................35
4.13 Quadrature Decoder (QDEC)......................................................................................................................35
4.14 Analog to Digital Converter (ADC)...........................................................................................................35
4.15 GPIO Task Event blocks (GPIOTE)..............................................................................................................35
4.16 Low Power Comparator (LPCOMP)..........................................................................................................35
5 Instance table .......................................................................................................................................... 36
6 Absolute maximum ratings .................................................................................................................. 37
7 Operating conditions............................................................................................................................. 38
7.1 WLCSP light sensitivity .................................................................................................................................38
8 Electrical specifications ......................................................................................................................... 39
8.1 Clock sources ...................................................................................................................................................39
8.2 Power management......................................................................................................................................44
8.3 Block resource requirements .....................................................................................................................48
8.4 CPU ......................................................................................................................................................................48
8.5 Radio transceiver ............................................................................................................................................49
8.6 Received Signal Strength Indicator (RSSI) specifications.................................................................54
8.7 Universal Asynchronous Receiver/Transmitter (UART) specifications........................................55
8.8 Serial Peripheral Interface Slave (SPIS) specifications .......................................................................56
Page 8
nRF51422 Product Specification v3.2
8.9 Serial Peripheral Interface (SPI) Master specifications ......................................................................57
8.10 I2C compatible Two Wire Interface (TWI) specifications..................................................................58
8.11 GPIO Tasks and Events (GPIOTE) specifications...................................................................................59
8.12 Analog to Digital Converter (ADC) specifications...............................................................................60
8.13 Timer (TIMER) specifications.......................................................................................................................61
8.14 Real Time Counter (RTC) ..............................................................................................................................61
8.15 Temperature sensor (TEMP) .......................................................................................................................61
8.16 Random Number Generator (RNG) specifications..............................................................................62
8.17 AES Electronic Codebook Mode Encryption (ECB)specifications..................................................62
8.18 AES CCM Mode Encryption (CCM) specifications ...............................................................................62
8.19 Accelerated Address Resolver (AAR) specifications...........................................................................62
8.20 Watchdog Timer (WDT) specifications ...................................................................................................63
8.21 Quadrature Decoder (QDEC) specifications .........................................................................................63
8.22 Non-Volatile Memory Controller (NVMC) specifications..................................................................64
8.23 General Purpose I/O (GPIO) specifications............................................................................................65
8.24 Low Power Comparator (LPCOMP) specifications..............................................................................65
9 Mechanical specifications ..................................................................................................................... 66
9.1 QFN48 package...............................................................................................................................................66
9.2 CDAB WLCSP package..................................................................................................................................67
9.3 CEAA WLCSP package...................................................................................................................................68
9.4 CFAC WLCSP package...................................................................................................................................69
10 Ordering information ............................................................................................................................ 70
10.1 Chip marking....................................................................................................................................................70
10.2 Inner box label.................................................................................................................................................70
10.3 Outer box label................................................................................................................................................71
10.4 Order code ........................................................................................................................................................71
10.5 Abbreviations...................................................................................................................................................72
10.6 Code ranges and values...............................................................................................................................73
10.7 Product options ..............................................................................................................................................75
11 Reference circuitry.................................................................................................................................. 76
11.1 PCB guidelines.................................................................................................................................................76
11.2 Reference design schematics.....................................................................................................................78
11.3 QFAA QFN48 package ..................................................................................................................................79
11.4 QFAB QFN48 package...................................................................................................................................85
11.5 QFAC QFN48 package...................................................................................................................................91
11.6 CDAB WLCSP package..................................................................................................................................97
11.7 CEAA WLCSP package................................................................................................................................ 103
11.8 CFAC WLCSP package................................................................................................................................ 109
12 Glossary ..................................................................................................................................................115
Page 9
nRF51422 Product Specification v3.2
1 Introduction
The nRF51422 chip is an ultra-low power 2.4 GHz wireless System on Chip (SoC) integrating the nRF51 Series
2.4 GHz transceiver, a 32 bit ARM® Cortex™-M0 CPU, flash memory, and analog and digital peripherals.
nRF51422 supports ANT, Bluetooth® low energy, and a range of proprietary 2.4 GHz protocols, such as Gazell
from Nordic Semiconductor.
A range of fully qualified wireless protocol stacks for the nRF51422 are available as SoftDevices from our
Infocenter.
nRF51422 supports the following SoftDevice series:
• S200 - ANT stacks
• S300 - ANT/Bluetooth low energy stack
Note: The S200 and S300 SoftDevices are restricted to run only on nRF51422 devices.
SoftDevices can be installed on the nRF51422 independent of your own application code.
1.1 Required reading
The following documentation is available for download from our Infocenter:
•nRF51 Series Reference Manual
• nRF51422-PAN (Product Anomaly Notification)
• PCN-093 (nRF51422 Product Change Notification)
1.2 Writing conventions
This product specification follows a set of typographic rules to ensure that the document is consistent and
easy to read. The following writing conventions are used:
• Command, event names, and bit state conditions, are written in Lucida Console.
• Pin names and pin signal conditions are written in Consolas.
• File names and User Interface components are written in bold.
• Internal cross references are italicized and written in semi-bold.
• Placeholders for parameters are written in italic regular text font. For example, a syntax
description of Connect will be written as:
Connect(TimeOut, AdvInterval).
• Fixed parameters are written in regular text font. For example, a syntax description of
Connect will be written as:
Connect(0x00F0, Interval).
Page 10
nRF51422 Product Specification v3.2
2 Product overview
2.1 Block diagram
Figure 1 Block diagram
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Page 11
nRF51422 Product Specification v3.2
2.2 Pin assignments and functions
This section describes the pin assignment and the pin functions.
2.2.1 Pin assignment QFN48
Figure 2 Pin assignment - QFN48 packet
Note: VV = Variant code, HP = Build code, YYWWLL = Tracking code.
For more information, see Section 10.6 “Code ranges and values” on page 73.
nRF5102
QFN48
P0.03
1
2
3
4
5
6
7
8
9
10
11
12
17
18
19
20
13
14
15
16
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
P0.05
P0.30
VDD
VDD
DCC
P0.06
VSS
P0.10
P0.12
P0.13
P0.16
SWDIO/nRESET
AVDD
VSS
ANT2
ANT1
VDD_PA
P0.20
P0.19
P0.17
P0.27
P0.26
P0.25
P0.24
XC1
XC2
P0.02
P0.04
P0.07
P0.11
P0.14
P0.15
P0.08
P0.18
DEC1
P0.28
P0.29
P0.21
P0.22
exposed die pad
N51422
QFVVHP
YYWWLL
P0.09
VSS
AVDD
P0.23
SWDCLK
DEC2
P0.00
P0.01
Page 12
nRF51422 Product Specification v3.2
2.2.1.1 Pin functions QFN48
Pin Pin name Pin function Description
1VDD Power Power supply.
2DCC Power DC/DC output voltage to external LC filter.
3P0.30 Digital I/O General purpose I/O pin.
4P0.00
AREF0
Digital I/O
Analog input
General purpose I/O pin.
ADC/LPCOMP reference input 0.
5P0.01
AIN2
Digital I/O
Analog input
General purpose I/O pin.
ADC/LPCOMP input 2.
6P0.02
AIN3
Digital I/O
Analog input
General purpose I/O pin.
ADC/LPCOMP input 3.
7P0.03
AIN4
Digital I/O
Analog input
General purpose I/O pin.
ADC/LPCOMP input 4.
8P0.04
AIN5
Digital I/O
Analog input
General purpose I/O pin.
ADC/LPCOMP input 5.
9P0.05
AIN6
Digital I/O
Analog input
General purpose I/O pin.
ADC/LPCOMP input 6.
10
P0.06
AIN7
AREF1
Digital I/O
Analog input
Analog input
General purpose I/O pin.
ADC/LPCOMP input 7.
ADC/LPCOMP reference input 1.
11 P0.07 Digital I/O General purpose I/O pin.
12 VDD Power Power supply.
13 VSS Power Ground (0 V)1.
14 to 22 P0.08toP0.16 Digital I/O General purpose I/O pin.
23 SWDIO/nRESET Digital I/O System reset (active low). Hardware debug and flash
programming I/O.
24 SWDCLK Digital input Hardware debug and flash programming I/O.
25 to 28 P0.17toP0.20 Digital I/O General purpose I/O pin.
29 DEC2 Power Power supply decoupling.
30 VDD_PA Power output Power supply output (+1.6 V) for on-chip RF power amp.
31 ANT1 RF Differential antenna connection (TX and RX).
32 ANT2 RF Differential antenna connection (TX and RX).
33, 34 VSS Power Ground (0 V).
35, 36 AVDD Power Analog power supply (Radio).
37 XC1 Analog input Connection for 16/32 MHz crystal or external 16 MHz clock
reference.
38 XC2 Analog output Connection for 16/32 MHz crystal.
39 DEC1 Power Power supply decoupling.
Page 13
nRF51422 Product Specification v3.2
Table 1 Pin functions QFN48 packet
2.2.2 CDAB WLCSP ball assignment and functions
Figure 3 Ball assignment CDAB packet (top side view)
40 to 44 P0.21toP0.25 Digital I/O General purpose I/O pin.
45
P0.26
AIN0
XL2
Digital I/O
Analog input
Analog output
General purpose I/O pin.
ADC/LPCOMP input 0.
Connection for 32.768 kHz crystal.
46
P0.27
AIN1
XL1
Digital I/O
Analog input
Analog input
General purpose I/O pin.
ADC/LPCOMP input 1.
Connection for 32.768 kHz crystal or external 32.768 kHz
clock reference.
47, 48 P0.28andP0.29 Digital I/O General purpose I/O pin.
1. The exposed center pad of the QFN48 package must be connected to ground for proper device operation.
Pin Pin name Pin function Description
654321987
A
B
C
D
E
F
G
H
N51422
CDABHP
YYWWLL
Page 14
nRF51422 Product Specification v3.2
2.2.2.1 Ball functions CDAB
Ball Name Function Description
A1 AVDD Power Analog power supply (Radio).
A2 XC1 Analog input Crystal connection for 16/32 MHz crystal oscillator or
external 16/32 MHz crystal reference.
A3 XC2 Analog output Crystal connection for 16/32 MHz crystal.
A4 DEC1 Power Power supply decoupling.
A5 P0.21 Digital I/O General purpose I/O.
A6 P0.24 Digital I/O General purpose I/O.
A7
P0.26
AIN0
XL2
Digital I/O
Analog input
Analog output
General purpose I/O.
ADC input 0.
Crystal connection for 32.768 kHz crystal oscillator.
A8
P0.27
AIN1
XL1
Digital I/O
Analog input
Analog input
General purpose I/O.
ADC input 1.
Crystal connection for 32.768 kHz crystal oscillator or
external 32.768 kHz crystal reference.
B1 VSS Power Ground (0 V).
B4 VSS Power Ground (0 V).
B5 P0.22 Digital I/O General purpose I/O.
B6 P0.23 Digital I/O General purpose I/O.
B7 P0.28 Digital I/O General purpose I/O.
B8 VDD Power Power supply.
B9 DCC Power DC/DC output voltage to external LC filter.
C1 ANT2 RF Differential antenna connection (TX and RX).
C5 P0.25 Digital I/O General purpose I/O.
C6 N.C. No Connection Must be soldered to PCB.
C7 P0.29 Digital I/O General purpose I/O.
C8 P0.30 Digital I/O General purpose I/O.
C9 P0.00
AREF0
Digital I/O
Analog input
General purpose I/O.
ADC Reference voltage.
D1 ANT1 RF Differential antenna connection (TX and RX).
D7 VSS Power Ground (0 V).
D8 P0.31 Digital I/O General purpose I/O.
D9 P0.02
AIN3
Digital I/O
Analog input
General purpose I/O.
ADC input 3.
E1 VDD_PA Power output Power supply output (+1.6 V) for on-chip RF power amp.
E2 N.C. No Connection Must be soldered to PCB.
E3 N.C. No Connection Must be soldered to PCB.
E7 P0.01
AIN2
Digital I/O
Analog input
General purpose I/O.
ADC input 2.
E8 P0.04
AIN5
Digital I/O
Analog input
General purpose I/O.
ADC input 5.
Page 15
nRF51422 Product Specification v3.2
Table 2 Ball functions CDAB packet
E9 P0.03
AIN4
Digital I/O
Analog input
General purpose I/O.
ADC input 4.
F1 DEC2 Power Power supply decoupling.
F2 P0.19 Digital I/O General purpose I/O.
F3 P0.18 Digital I/O General purpose I/O.
F4 VSS Power Ground (0 V).
F5 N.C. No Connection Must be soldered to PCB.
F6 VSS Power Ground (0 V).
F7 N.C. No Connection Must be soldered to PCB.
F8
P0.06
AIN7
AREF1
Digital I/O
Analog input
Analog input
General purpose I/O.
ADC input 7.
ADC Reference voltage.
F9 VSS Power Ground (0 V).
G1 P0.20 Digital I/O General purpose I/O.
G2 SWDCLK Digital input Hardware debug and flash programming I/O.
G3 P0.17 Digital I/O General purpose I/O.
G4 P0.14 Digital I/O General purpose I/O.
G5 P0.13 Digital I/O General purpose I/O.
G6 P0.10 Digital I/O General purpose I/O.
G7 P0.07 Digital I/O General purpose I/O.
G8 VDD Power Power supply.
G9 P0.05
AIN6
Digital I/O
Analog input
General purpose I/O.
ADC input 6.
H2 nRESET
SWDIO
Digital I/O System reset (active low).
Hardware debug and flash programming I/O.
H3 P0.16 Digital I/O General purpose I/O.
H4 P0.15 Digital I/O General purpose I/O.
H5 P0.12 Digital I/O General purpose I/O.
H6 P0.11 Digital I/O General purpose I/O.
H7 P0.09 Digital I/O General purpose I/O.
H8 P0.08 Digital I/O General purpose I/O.
Ball Name Function Description
Page 16
nRF51422 Product Specification v3.2
2.2.3 CEAA and CFAC WLCSP ball assignment and functions
Figure 4 Ball assignment CEAA and CFACpacket (top side view)
Note: HP = Buildcode, YYWWLL = Tracking code
Solder balls not visible on the top side. Dot denotes A1 corner.
654321987
A
B
C
D
E
F
G
H
J
N51422
CEAAHP
YYWWLL
654321987
A
B
C
D
E
F
G
H
J
N51422
CFACHP
YYWWLL
Page 17
nRF51422 Product Specification v3.2
2.2.3.1 Ball functions CEAA and CFAC
Ball Name Function Description
A1 AVDD Power Analog power supply (Radio).
A2 XC1 Analog input Crystal connection for 16/32 MHz crystal oscillator or
external 16/32 MHz crystal reference.
A3 XC2 Analog output Crystal connection for 16/32 MHz crystal.
A4 DEC1 Power Power supply decoupling.
A5 P0.21 Digital I/O General purpose I/O.
A6 P0.24 Digital I/O General purpose I/O.
A7
P0.26
AIN0
XL2
Digital I/O
Analog input
Analog output
General purpose I/O.
ADC input 0.
Crystal connection for 32.768 kHz crystal oscillator.
A8
P0.27
AIN1
XL1
Digital I/O
Analog input
Analog input
General purpose I/O.
ADC input 1.
Crystal connection for 32.768 kHz crystal oscillator or
external 32.768 kHz crystal reference.
B1 VSS Power Ground (0 V).
B4 VSS Power Ground (0 V).
B5 P0.22 Digital I/O General purpose I/O.
B6 P0.23 Digital I/O General purpose I/O.
B7 P0.28 Digital I/O General purpose I/O.
B8 VDD Power Power supply.
B9 DCC Power DC/DC output voltage to external LC filter.
C1 ANT2 RF Differential antenna connection (TX and RX).
C5 P0.25 Digital I/O General purpose I/O.
C6 N.C. No Connection Must be soldered to PCB.
C7 P0.29 Digital I/O General purpose I/O.
C8 VSS Power Ground (0 V).
C9 P0.00
AREF0
Digital I/O
Analog input
General purpose I/O.
ADC Reference voltage.
D1 ANT1 RF Differential antenna connection (TX and RX).
D7 VSS Power Ground (0 V).
D8 P0.30 Digital I/O General purpose I/O.
D9 P0.02
AIN3
Digital I/O
Analog input
General purpose I/O.
ADC input 3.
E1 VDD_PA Power output Power supply output (+1.6 V) for on-chip RF power amp.
E2 N.C. No Connection Must be soldered to PCB.
E3 N.C. No Connection Must be soldered to PCB.
E7 N.C. No Connection Must be soldered to PCB.
E8 P0.31 Digital I/O General purpose I/O.
E9 P0.01
AIN2
Digital I/O
Analog input
General purpose I/O.
ADC input 2.
Page 18
nRF51422 Product Specification v3.2
Table 3 Ball functions for CEAA and CFAC
F1 DEC2 Power Power supply decoupling.
F2 P0.19 Digital I/O General purpose I/O.
F3 N.C. No Connection Must be soldered to PCB.
F7 N.C. No Connection Must be soldered to PCB.
F8 P0.04
AIN5
Digital I/O
Analog input
General purpose I/O.
ADC input 5.
F9 P0.03
AIN4
Digital I/O
Analog input
General purpose I/O.
ADC input 4.
G1 P0.20 Digital I/O General purpose I/O.
G2 P0.17 Digital I/O General purpose I/O.
G3 N.C. No Connection Must be soldered to PCB.
G4 N.C. No Connection Must be soldered to PCB.
G5 N.C. No Connection Must be soldered to PCB.
G6 VSS Power Ground (0 V).
G7 N.C. No Connection Must be soldered to PCB.
G8
P0.06
AIN7
AREF1
Digital I/O
Analog input
Analog input
General purpose I/O.
ADC input 7.
ADC Reference voltage.
G9 VSS Power Ground (0 V).
H1 P0.18 Digital I/O General purpose I/O.
H2 SWDCLK Digital input Hardware debug and flash programming I/O.
H3 VSS Power Ground (0 V).
H4 P0.14 Digital I/O General purpose I/O.
H5 P0.13 Digital I/O General purpose I/O.
H6 P0.10 Digital I/O General purpose I/O.
H7 P0.07 Digital I/O General purpose I/O.
H8 VDD Power Power supply.
H9 P0.05
AIN6
Digital I/O
Analog input
General purpose I/O.
ADC input 6.
J2 SWDIO/
nRESET Digital I/O System reset (active low). Also Hardware debug and flash
programming I/O.
J3 P0.16 Digital I/O General purpose I/O.
J4 P0.15 Digital I/O General purpose I/O.
J5 P0.12 Digital I/O General purpose I/O.
J6 P0.11 Digital I/O General purpose I/O.
J7 P0.09 Digital I/O General purpose I/O.
J8 P0.08 Digital I/O General purpose I/O.
Ball Name Function Description
Page 19
nRF51422 Product Specification v3.2
3 System blocks
The chip contains system-level features common to all nRF51 Series devices including clock control, power
and reset, interrupt system, Programmable Peripheral Interconnect (PPI), watchdog, and GPIO.
System blocks which have a register interface and/or interrupt vector assigned are instantiated in the device
address space. The instances of system blocks, their associated ID (for those with interrupt vectors), and base
addresses are found in Table 18 on page 36. Detailed functional descriptions, configuration options, and
register interfaces can be found in the nRF51 Series Reference Manual.
3.1 CPU
The ARM® Cortex™-M0 CPU has a 16 bit instruction set with 32 bit extensions (Thumb-2® technology) that
delivers high-density code with a small-memory-footprint. By using a single-cycle 32 bit multiplier, a 3-stage
pipeline, and a Nested Vector Interrupt Controller (NVIC), the ARM Cortex-M0 CPU makes program
execution simple and highly efficient.
The ARM Cortex Microcontroller Software Interface Standard (CMSIS) hardware abstraction layer for the
ARM Cortex-M processor series is implemented and available for M0 CPU. Code is forward compatible with
ARM Cortex M3 based devices.
Page 20
nRF51422 Product Specification v3.2
3.2 Memory
All memory and registers are found in the same address space as shown in the Device Memory Map, see
Figure 5. Devices in the nRF51 Series use flash based memory in the code, FICR, and UICR regions.
The RAM region is SRAM.
Figure 5 Memory Map
The embedded flash memory for program and static data can be programmed using In Application
Programming (IAP) routines from RAM through the SWD interface, or in-system from a program executing
from code area. The Non-Volatile Memory Controller (NVMC) is used for program/erase operations. Regions
of flash memory can be protected from read, write, and erase by the Memory Protection Unit (MPU). A User
Information Configuration Register (UICR) contains the lock byte for enabling readback protection to secure
the IP, while individual block protection is controlled using registers which can only be cleared on chip reset.
reserved
0xFFFFFFFF
Private Peripheral Bus
0xE0100000
reserved
AHB peripherals
0xE0000000
0x50000000
APB peripherals
reserved
RAM
0x40000000
0x20000000
reserved
FICR
reserved
reserved
Code
0x00000000
0x10000000
0x40080000
UICR
reserved
0x10001000
Page 21
nRF51422 Product Specification v3.2
3.2.1 Code organization
Table 4 Code organization
3.2.2 RAM organization
RAM is divided into blocks for separate power management which is controlled by the POWER System Block.
Each block is divided into two 4 kByte RAM sections with separate RAM AHB slaves.
Please see the nRF51 Series Reference Manual for more information.
Table 5 RAM organization
How to organize the use of the RAM
For the best performance we recommend the following use of the RAM AHB slaves (Note that the Crypto
consists of CCM, ECB, and AAR modules):
• If the Radio and Crypto buffers together are larger in size than one RAM section, the buffers
should be separated so the memory used by the Radio is in one RAM section while the
memory used by the Crypto is in another RAM section.
• The sections used by CODE should not be combined with sections used by the Radio,
Crypto, or SPI.
• The Stack and Heap should be placed at the top section and should not be combined with
sections used by the Radio, Crypto, or SPI.
Chip variant Code size Page size No of pages
nRF51422-QFAA
nRF51422-CEAA 256 kB 1024 byte 256
nRF51422-QFAB
nRF51422-CDAB 128 kB 1024 byte 128
nRF51422-QFAC
nRF51422-CFAC 256 kB 1024 byte 256
Chip variant RAM size Block Size
nRF51422-QFAA
nRF51422-CEAA 16 kB Block0
Block1
8 kB
8 kB
nRF51422-QFAB
nRF51422-CDAB 16 kB Block0
Block1
8 kB
8 kB
nRF51422-QFAC
nRF51422-CFAC 32 kB
Block0
Block1
Block2
Block3
8 kB
8 kB
8 kB
8 kB
Page 22
nRF51422 Product Specification v3.2
Table 6 and Table 7 shows how memory allocated to different functions can be distributed between RAM
sections for parallel access. There is a table for chip variants with 16 kB or 32 kB RAM.
Table 6 16 kB RAM variants
Table 7 32 kB RAM variants
3.3 Memory Protection Unit (MPU)
The memory protection unit can be configured to protect all flash memory on the device from readback, or
to protect blocks of flash from over-write or erase.
Table 8 MPU flash blocks
RAM
Blocks/Sections
Radio
buffers
Crypto
buffers
SPIS
buffers
CPU
Stack/Heap CODE Global
variables
Block0 RAM0 x x x
RAM1 x x
Block1 RAM2 x x
RAM3 x x x
RAM
Blocks/Sections
Radio
buffers
Crypto
buffers
SPIS
buffers
CPU
Stack/Heap CODE Global
variables
Block0 RAM0 x (x) x
RAM1 (x) x x
Block1 RAM2 x x
RAM3 x x
Block2 RAM4 x x
RAM5 x x
Block3 RAM6 x x
RAM7 x x x
Chip variant Flash block size Number of protectable Flash blocks
nRF51422-QFAA
nRF51422-CEAA 4 kB 64
nRF51422-QFAB
nRF51422-CDAB 4 kB 32
nRF51422-QFAC
nRF51422-CFAC 4 kB 64
Page 23
nRF51422 Product Specification v3.2
3.4 Power management (POWER)
3.4.1 Power supply
nRF51 supports three different power supply alternatives:
• Internal LDO setup
•DC/DC converter setup
• Low voltage mode setup
See Table 20 on page 38 for the voltage range on the different alternatives. See Chapter 11 “Reference
circuitry” on page 76 for details on the schematic used for the different power supply alternatives.
3.4.1.1 Internal LDO setup
In internal LDO mode the DC/DC converter is bypassed (disabled) and the system power is generated
directly from the supply voltage VDD. This mode could be used as the only option or in combination with
the DC/DC converter setup. See DC/DC converter section for more details.
3.4.1.2 DC/DC converter setup
The nRF51 DC/DC buck converter transforms battery voltage to lower internal voltage with minimal power
loss. The converted voltage is then available for the linear regulator input. The DC/DC converter can be
disabled when the supply voltage drops to the lower limit of the voltage range so the LDO can be used for
low supply voltages. When enabled, the DC/DC converter operation is automatically suspended between
radio events when only the low current regulator is needed internally.
This feature is particularly useful for applications using battery technologies with nominal cell voltages
higher than the minimum supply voltage with DC/DC enabled. The reduction in supply voltage level from a
high voltage to a low voltage reduces the peak power drain from the battery. Used with a 3 V coin-cell
battery, the peak current drawn from the battery is reduced by approximately 25%.
3.4.1.3 Low voltage mode setup
Devices can be used in low voltage mode where a steady 1.8 V supply is available externally.
Page 24
nRF51422 Product Specification v3.2
3.4.2 Power management
The power management system is highly flexible with functional blocks such as the CPU, Radio Transceiver,
and peripherals having separate power state control in addition to the global System ON and OFF modes. In
System OFF mode, RAM can be retained and the device state can be changed to System ON through Reset,
GPIO DETECT signal, or LPCOMP ANADETECT signal. When in System ON mode, all functional blocks will
independently be in IDLE or RUN mode depending on needed functionality.
Power management features:
• Supervisor HW to manage
•Power on reset
•Brownout reset
• Power fail comparator
• System ON/OFF modes
• Pin wake-up from System OFF
•Reset
• GPIO DETECT signal
• LPCOMP ANADETECT signal
• Functional block RUN/IDLE modes
• RAM retention in System OFF mode (8 kB blocks)
• 16 kB version will have 2 blocks
• 32 kB version will have 4 blocks
3.4.2.1 System OFF mode
In system OFF mode the chip is in the deepest power saving mode. The system's core functionality is
powered down and all ongoing tasks are terminated. The only functionality that can be set up to be
responsive is the Pin wake-up mechanism.
One or more blocks of RAM can be retained while in System OFF mode.
Page 25
nRF51422 Product Specification v3.2
3.4.2.2 System ON mode
In system ON mode the system is fully operational and the CPU and selected peripherals can be brought
into a state where they are functional and more or less responsive depending on the sub-power mode
selected.
There are two sub-power modes:
•Low power
• Constant latency
Low Power
In Low Power mode the automatic power management system is optimized to save power. This is done by
keeping as much as possible of the system powered down. The cost of this is that you will have varying CPU
wakeup latency and PPI task response.
The CPU wakeup latency will be affected by the startup time of the 1V7 regulator. The PPI task response will
vary depending on the resources required by the peripheral where the task originated.
The resources that could be involved are:
• 1V7 with the startup time t1V7
• 1V2 with the startup time t1V2
• One of the following clock sources
• RC16 with the startup time tSTART,RC16
• XO16M/XO32M with the startup time the clock management system tXO1
Constant Latency
In Constant Latency mode the system is optimized for keeping the CPU latency and the PPI task response
constant and at a minimum. This is secured by forcing a set of base resources on while in sleep mode. The
cost is that the system will have higher power consumption.
The following resources are kept active while in sleep mode:
• 1V7 regulator with the standby current of I1V7
• 1V2 regulator. Here the current consumption is specified in combination with the clock
source.
• One of the following clock sources:
• RC16 with the standby current of I1V2RC16
• XO16M with the standby current of I1V2XO16
• XO32M with the standby current of I1V2XO32
1. For the clock source XO16M and XO32M we assume that the crystal is already running (standby). This will give an increase of the
power consumption in sleep mode given by ISTBY,X16M / ISTBY,X32M.
Page 26
nRF51422 Product Specification v3.2
3.5 Programmable Peripheral Interconnect (PPI)
The Programmable Peripheral Interconnect (PPI) enables peripherals to interact autonomously with each
other using tasks and events independent of the CPU. The PPI allows precise synchronization between
peripherals when real-time application constraints exist and eliminates the need for CPU activity to
implement behavior which can be predefined using PPI.
Table 9 PPI properties
The PPI system has in addition to the fully programmable peripheral interconnections, a set of channels
where the event (EEP) and task (TEP) endpoints are set in hardware. These fixed channels can be individually
enabled, disabled, or added to PPI channel groups in the same way as ordinary PPI channels. See the nRF51
Series Reference Manual for more information.
Table 10 Pre-programmed PPI channels
Instance Channel Number of channels Number of groups
PPI 0 - 15 16 4
Instance Channel Number of channels Number of groups
PPI 20 - 31 12 4
Page 27
nRF51422 Product Specification v3.2
3.6 Clock management (CLOCK)
The advanced clock management system can source the system clocks from a range of internal or external
high and low frequency oscillators and distribute them to modules based upon a module’s individual
requirements. This prevents large clock trees from being active and drawing power when system modules
needing this clock reference are not active.
If an application enables a module that needs a clock reference without the corresponding oscillator
running, the clock management system will automatically enable the RC oscillator option and provide the
clock. When the module goes back to idle, the clock management will automatically set the oscillator to idle.
To avoid delays involved in starting a given oscillator, or if a specific oscillator is required, the application can
override the automatic oscillator management so it keeps oscillators active when no system modules
require the clock reference.
Clocks are only available in System ON mode and can be generated by the sources listed in Table 11.
Table 11 Clock properties
Figure 6 Clock management
Clock Source Frequency options
High Frequency Clock (HFCLK)1
1. External Crystal must be used for Radio operation.
External Crystal (XOSC) 16/32 MHz2
2. The HFCLK will be 16 MHz for both the 16 and 32 MHz crystal option.
External clock reference3
3. See the nRF51 Series Reference Manual for more details on external clock reference.
16 MHz
Internal RC Oscillator (RCOSC) 16 MHz
Low Frequency Clock (LFCLK)
External Crystal (XOSC) 32.768 kHz
External clock reference332.768 kHz
Synthesized from HFCLK 32.768 kHz
Internal RC Oscillator (RCOSC) 32.768 kHz
32.768 kHz
RC
oscillator
32.768 kHz
crystal
oscillator
16 MHz
RC
oscillator
16/32 MHz
crystal
oscillator
LFCLK
clock control
HFCLK
clock control
HFCLK
LFCLK
LFCLKSRC
LFCLKSTART
LFCLKSTOP
LFCLKSTARTED
HFCLKSTART
HFCLKSTOP
HFCLKSTARTED
Request from the
rest of the system
XL1 XL2 XC1 XC2
32.768 kHz
synthesizer
HFCLKSRC
Page 28
nRF51422 Product Specification v3.2
3.6.1 16/32 MHz crystal oscillator
The crystal oscillator can be controlled either by a 16 MHz or a 32 MHz external crystal. However, the system
clock is always 16 MHz, see the nRF51 Series Reference Manual for more details. The crystal oscillator is
designed for use with an AT-cut quartz crystal in parallel resonant mode. To achieve correct oscillation
frequency, the load capacitance must match the specification in the crystal data sheet. Figure 7 shows how
the crystal is connected to the 16/32 MHz crystal oscillator.
Figure 7 Circuit diagram of the 16/32 MHz crystal oscillator
The load capacitance (CL) is the total capacitance seen by the crystal across its terminals and is given by:
C1’ = C1 + C_pcb1 + C_pin
C2’ = C2 + C_pcb2 + C_pin
C1 and C2 are ceramic SMD capacitors connected between each crystal terminal and ground. C_pcb1 and
C_pcb2 are stray capacitances on the PCB. C_pin is the pin input capacitance on the XC1 and XC2 pins, see
Table 22 on page 40 (16 MHz) and Table 23 on page 41 (32 MHz). The load capacitors C1 and C2 should have
the same value. See Chapter 11 “Reference circuitry” on page 76 for the capacitance value used for C_pcb1
and C_pcb2 in reference circuitry.
For reliable operation, the crystal load capacitance, shunt capacitance, equivalent series resistance (RS,X16M/
RS,X32M), and drive level must comply with the specifications in Table 22 on page 40 (16 MHz) and Table 23
on page 41 (32 MHz). It is recommended to use a crystal with lower than maximum RS,X16M/RS,X32M if the
load capacitance and/or shunt capacitance is high. This will give faster startup and lower current
consumption. A low load capacitance will reduce both startup time and current consumption.
C1 C2
16/32 MHz
crystal
XC1 XC2
CL C1' C2'
C1' C2'+
----------------------------
=
Page 29
nRF51422 Product Specification v3.2
3.6.2 32.768 kHz crystal oscillator
The 32.768 kHz crystal oscillator is designed for use with a quartz crystal in parallel resonant mode. To
achieve correct oscillation frequency, the load capacitance must match the specification in the crystal data
sheet. Figure 8 shows how the crystal is connected to the 32.768 kHz crystal oscillator.
Figure 8 Circuit diagram of the 32.768 kHz crystal oscillator
The load capacitance (CL) is the total capacitance seen by the crystal across its terminals and is given by:
C1’ = C1 + C_pcb1 + C_pin
C2’ = C2 + C_pcb2 + C_pin
C1 and C2 are ceramic SMD capacitors connected between each crystal terminal and ground. C_pcb1 and
C_pcb2 are stray capacitances on the PCB. C_pin is the pin input capacitance on the XC1 and XC2 pins, see
Section 8.1.5 “32.768 kHz crystal oscillator (32k XOSC)” on page 42. The load capacitors C1 and C2 should
have the same value. See Chapter 11 “Reference circuitry” on page 76 for the capacitance value used for
C_pcb1 and C_pcb2 in reference circuitry.
3.6.3 32.768 kHz RC oscillator
The 32.768 kHz RC low frequency oscillator may be used as an alternative to the 32.768 kHz crystal oscillator.
It has a frequency accuracy of less than ± 250 ppm in a stable temperature environment or when calibration
is periodically performed in changing temperature environments. The 32.768 kHz RC oscillator does not
require external components.
Note: The ANT protocol stack requires an accuracy of ±50 ppm, thus the 32.768 kHz RC oscillator
must not be used when running the ANT stack.
C1 C2
32.768 kHz
crystal
XL1 XL2
CL C1' C2'
C1' C2'+
----------------------------
=
Page 30
nRF51422 Product Specification v3.2
3.6.4 Synthesized 32.768 kHz clock
The low frequency clock can be synthesized from the high frequency clock. This saves the cost of a crystal
but increases average power consumption as the high frequency clock source will have to be active.
3.7 GPIO
The general purpose I/O is organized as one port with up to 32 I/Os (dependent on package) enabling
access and control of up to 32 pins through one port. Each GPIO can be accessed individually with the
following user configurable features:
•Input/output direction
• Output drive strength
• Internal pull-up and pull-down resistors
• Wake-up from high or low level triggers on all pins
• Trigger interrupt on all pins
• All pins can be used by the PPI task/event system. The maximum number of pins that can be
interfaced through the PPI at the same time is limited by the number of GPIOTE channels.
• All pins can be individually configured to carry serial interface or quadrature demodulator
signals.
3.8 Debugger support
The two pin Serial Wire Debug (SWD) interface provided as a part of the Debug Access Port (DAP) offers a
flexible and powerful mechanism for non-intrusive debugging of program code. Breakpoints and single
stepping are part of this support.
Page 31
nRF51422 Product Specification v3.2
4 Peripheral blocks
Peripheral blocks which have a register interface and/or interrupt vector assigned are instantiated, one or
more times, in the device address space. The instances, associated ID (for those with interrupt vectors), and
base address of features are found in Table 18 on page 36. Detailed functional descriptions, configuration
options, and register interfaces can be found in the nRF51 Series Reference Manual.
4.1 2.4 GHz radio (RADIO)
The nRF51 Series 2.4 GHz RF transceiver is designed and optimized to operate in the worldwide ISM
frequency band at 2.400 to 2.4835 GHz. Radio modulation modes and configurable packet structure enable
interoperability with Bluetooth® low energy (BLE), ANT™, Enhanced ShockBurst™, and other
2.4 GHz protocol implementations.
The transceiver receives and transmits data directly to and from system memory for flexible and efficient
packet data management. The nRF51 Series transceiver has the following features:
• General modulation features
•GFSK modulation
• Data whitening
•On-air data rates
• 250 kbps
•1 Mbps
•2 Mbps
• Transmitter with programmable output power of +4 dBm to -20 dBm, in 4 dB steps
• Transmitter whisper mode -30 dBm
• RSSI function (1 dB resolution)
• Receiver with integrated channel filters achieving maximum sensitivity
• -96 dBm at 250 kbps
• -93 dBm at 1 Mbps BLE
•-90 dBm at 1 Mbps
•-85 dBm at 2 Mbps
• RF Synthesizer
• 1 MHz frequency programming resolution
• 1 MHz non-overlapping channel spacing at 1 Mbps and 250 kbps
• 2 MHz non-overlapping channel spacing at 2 Mbps
• Works with low-cost ± 60 ppm 16 MHz crystal oscillators
• Baseband controller
• EasyDMA RX and TX packet transfer directly to and from RAM
• Dynamic payload length
• On-the-fly packet assembly/disassembly and AES CCM payload encryption
• 8 bit, 16 bit, and 24 bit CRC check (programmable polynomial and initial value)
Note: EasyDMA is an integrated DMA implementation requiring no configuration to take advantage
of flexible data management and avoids copying operations to and from RAM.
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nRF51422 Product Specification v3.2
4.2 Timer/counters (TIMER)
The timer/counter runs on the high-frequency clock source (HFCLK) and includes a 4 bit (1/2X) prescaler that
can divide the HFCLK.
The TIMER will start requesting the 1 MHz mode of the HFCLK for values of the prescaler that gives fTIMER less
or equal to 1 MHz. If the timer module is the only one requesting the HFCLK, the system will automatically
switch to using the 1 MHz mode resulting in a decrease in the current consumption. See the parameters
I1v2XO16,1M, I1v2XO32,1M, I1v2RC16,1M in Table 32 on page 47 and ITIMER0/1/2,1M in Table 52 on page 61.
The task/event and interrupt features make it possible to use the PPI system for timing and counting tasks
between any system peripheral including any GPIO of the device. The PPI system also enables the TIMER
task/event features to generate periodic output and PWM signals to any GPIO. The number of input/outputs
used at the same time is limited by the number of GPIOTE channels.
Table 12 Timer/counter properties
4.3 Real Time Counter (RTC)
The Real Time Counter (RTC) module provides a generic, low power timer on the low-frequency clock source
(LFCLK). The RTC features a 24 bit COUNTER, 12 bit (1/X) prescaler, capture/compare registers, and a tick
event generator for low power, tickless RTOS implementation.
Table 13 RTC properties
4.4 AES Electronic Codebook Mode Encryption (ECB)
The ECB encryption block supports 128 bit AES block encryption. It can be used for a range of cryptographic
functions like hash generation, digital signatures, and keystream generation for data encryption/decryption.
ECB encryption uses EasyDMA to access system RAM for in-place operations on cleartext and ciphertext
during encryption.
Instance Bit-width Capture/Compare registers
TIMER0 8/16/24/32 4
TIMER1 8/16 4
TIMER2 8/16 4
Instance Capture/Compare registers
RTC0 3
RTC1 4
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nRF51422 Product Specification v3.2
4.5 AES CCM Mode Encryption (CCM)
Cipher Block Chaining - Message Authentication Code (CCM) Mode is an authenticated encryption
algorithm designed to provide both authentication and confidentiality during data transfer. CCM combines
counter mode encryption and CBC-MAC authentication.
Note: The CCM terminology "Message Authentication Code (MAC)" is called the "Message Integrity
Check (MIC)" in Bluetooth terminology and this document and the nRF51 Series Reference
Manual are consistent with Bluetooth terminology.
The CCM block generates an encrypted keystream, applies it to the input data using the XOR operation, and
generates the 4 byte MIC field in one operation. The CCM and radio can be configured to work
synchronously, as described in the nRF51 Series Reference Manual. The CCM will encrypt in time for
transmission and decrypt after receiving bytes into memory from the Radio. All operations can complete
within the packet RX or TX time.
CCM on this device is implemented according to Bluetooth requirements and the algorithm as defined in
IETF RFC3610, and depends on the AES-128 block cipher. A description of the CCM algorithm can also be
found in the NIST Special Publication 800-38C. The Bluetooth Core Specification v4.0 describes the
configuration of counter mode blocks and encryption blocks to implement compliant encryption for BLE.
The CCM block uses EasyDMA to load key, counter mode blocks (including the nonce required), and to read/
write plain text and cipher text.
4.6 Accelerated Address Resolver (AAR)
Accelerated Address Resolver is a cryptographic support function to implement the "Resolvable Private
Address Resolution Procedure" described in the Bluetooth Core Specification v4.1. "Resolvable Private
Address Generation" should be achieved using ECB and is not supported by AAR. The procedure allows two
devices that share a secret key to generate and resolve a hash based on their device address.
The AAR block enables real-time address resolution on incoming packets when configured according to the
description in the nRF51 Series Reference Manual. This allows real-time packet filtering (whitelisting) using a
list of known shared secrets (Identity Resolving Keys (IRK) in Bluetooth).
The following table outlines the properties of the AAR.
Table 14 AAR properties
4.7 Random Number Generator (RNG)
The Random Number Generator (RNG) generates true non-deterministic random numbers derived from
thermal noise that are suitable for cryptographic purposes. The RNG does not require a seed value.
4.8 Watchdog Timer (WDT)
A countdown watchdog timer using the low-frequency clock source (LFCLK) offers configurable and robust
protection against application lock-up. The watchdog can be paused during long CPU sleep periods for low
power applications and when the debugger has halted the CPU.
Instance Number of IRKs supported for simultaneous resolution
AAR 8
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nRF51422 Product Specification v3.2
4.9 Temperature sensor (TEMP)
The temperature sensor measures die temperature over the temperature range of the device with 0.25° C
resolution.
4.10 Serial Peripheral Interface (SPI/SPIS)
The SPI interfaces enable full duplex synchronous communication between devices. They support a three-
wire (SCK, MISO, MOSI) bi-directional bus with fast data transfers. The SPI Master can communicate with
multiple slaves using individual chip select signals for each of the slave devices attached to a bus. Control of
chip select signals is left to the application through use of GPIO signals. SPI Master has double buffered I/O
data. The SPI Slave includes EasyDMA for data transfer directly to and from RAM allowing Slave data
transfers to occur while the CPU is IDLE.
The GPIOs used for each SPI interface line can be chosen from any GPIO on the device and are
independently configurable. This enables great flexibility in device pinout and efficient use of printed circuit
board space and signal routing.
The SPI peripheral supports SPI mode 0, 1, 2, and 3.
Table 15 SPI properties
4.10.1 Enable 4 Mbps SPIS bit rate
In order to utilize 4 Mbps bit rate for SPIS, the SPIS must be the only peripheral using a specific RAM section.
Construction of RAM sections are described in Section 3.2.2 “RAM organization” on page 21. If other
peripherals than SPIS use a specific RAM section, only 2 Mbps bit rate is possible.
4.11 Two-wire interface (TWI)
The two-wire interface can communicate with a bi-directional wired-AND bus with two lines (SCL, SDA). The
protocol makes it possible to interconnect up to 127 individually addressable devices. The interface is
capable of clock stretching, supporting data rates of 100 kbps and 400 kbps.
The GPIOs used for each two-wire interface line can be chosen from any GPIO on the device and are
independently configurable. This enables great flexibility in device pinout and efficient use of board space
and signal routing.
Table 16 Two-wire properties
Instance Master/Slave
SPI0 Master
SPI1 Master
SPIS1 Slave
Instance Master/Slave
TWI0 Master
TWI1 Master
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nRF51422 Product Specification v3.2
4.12 Universal Asynchronous Receiver/Transmitter (UART)
The Universal Asynchronous Receiver/Transmitter offers fast, full-duplex, asynchronous serial
communication with built-in flow control (CTS, RTS) support in hardware up to 1 Mbps baud. Parity
checking is supported.
The GPIOs used for each UART interface line can be chosen from any GPIO on the device and are
independently configurable. This enables great flexibility in device pinout and efficient use of board space
and signal routing.
4.13 Quadrature Decoder (QDEC)
The quadrature decoder provides buffered decoding of quadrature-encoded sensor signals. It is suitable for
mechanical and optical sensors with an optional LED output signal and input debounce filters. The sample
period and accumulation are configurable to match application requirements.
4.14 Analog to Digital Converter (ADC)
The 10 bit incremental Analog to Digital Converter (ADC) enables sampling of up to 8 external signals
through a front-end multiplexer. The ADC has configurable input, reference prescaling, and sample
resolution (8, 9, and 10 bit).
Note: The ADC module uses the same analog inputs as the LPCOMP module (AIN0 - AIN7 and
AREF0 - AREF1). Only one of the modules can be enabled at the same time.
4.15 GPIO Task Event blocks (GPIOTE)
A GPIOTE block enables GPIOs on Port 0 to generate events on pin state change which can be used to carry
out tasks through the PPI system. A GPIO can also be driven to change state on system events using the PPI
system. Low power detection of pin state changes on Port 0 is possible when in System ON or System OFF.
Table 17 GPIOTE properties
4.16 Low Power Comparator (LPCOMP)
In System ON, the block can generate separate events on rising and falling edges of a signal, or sample the
current state of the pin as being above or below the threshold. The block can be configured to use any of the
analog inputs on the device. Additionally, the low power comparator can be used as an analog wakeup
source from System OFF or System ON. The comparator threshold can be programmed to a range of
fractions of the supply voltage.
Note: The LPCOMP module uses the same analog inputs as the ADC module (AIN0 - AIN7 and
AREF0 - AREF1). Only one of the modules can be enabled at the same time.
Instance Number of GPIOTE channels
GPIOTE 4
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nRF51422 Product Specification v3.2
5 Instance table
The peripheral instantiation of the chip is shown in the table below.
Table 18 Peripheral instance reference
ID Base address Peripheral Instance Description
0 0x40000000 POWER POWER Power Control.
00x40000000 CLOCK CLOCK Clock Control.
0 0x40000000 MPU MPU Memory Protection Unit.
10x40001000 RADIO RADIO 2.4 GHz Radio.
2 0x40002000 UART UART0 Universal Asynchronous Receiver/Transmitter.
30x40003000 SPI SPI0 SPI Master.
3 0x40003000 TWI TWI0 I2C compatible Two-Wire Interface 0.
40x40004000 SPIS SPIS1 SPI Slave.
4 0x40004000 SPI SPI1 SPI Master.
40x40004000 TWI TWI1 I2C compatible Two-Wire Interface 1.
5Unused.
60x40006000 GPIOTE GPIOTE GPIO Task and Events.
7 0x40007000 ADC ADC Analog to Digital Converter.
80x40008000 TIMER TIMER0 Timer/Counter 0.
9 0x40009000 TIMER TIMER1 Timer/Counter 1.
10 0x4000A000 TIMER TIMER2 Timer/Counter 2.
11 0x4000B000 RTC RTC0 Real Time Counter 0.
12 0x4000C000 TEMP TEMP Temperature Sensor.
13 0x4000D000 RNG RNG Random Number Generator.
14 0x4000E000 ECB ECB Crypto AES ECB.
15 0x4000F000 CCM CCM AES Crypto CCM.
15 0x4000F000 AAR AAR Accelerated Address Resolver.
15 0x4000F000 Unused.
16 0x40010000 WDT WDT Watchdog Timer.
17 0x40011000 RTC RTC1 Real Time Counter 1.
18 0x40012000 QDEC QDEC Quadrature Decoder.
19 0x40013000 LPCOMP LPCOMP Low Power Comparator.
20 - 25 Reserved as software interrupt.
26 - 29 Unused.
30 0x4001E000 NVMC NVMC Non-Volatile Memory Controller.
31 0x4001F000 PPI PPI Programmable Peripheral Interconnect.
NA 0x50000000 GPIO GPIO General Purpose Input and Output.
NA 0x10000000 FICR FICR Factory Information Configuration Registers.
NA 0x10001000 UICR UICR User Information Configuration Registers.
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nRF51422 Product Specification v3.2
6 Absolute maximum ratings
Maximum ratings are the extreme limits the chip can be exposed to without causing permanent damage.
Exposure to absolute maximum ratings for prolonged periods of time may affect the reliability of the chip.
Table 19 specifies the absolute maximum ratings.
Table 19 Absolute maximum ratings
Symbol Parameter Min. Max. Unit
Supply voltages
VDD -0.3 +3.9 V
DEC2 2V
VSS 0 V
I/O pin voltage
VIO -0.3 VDD + 0.3 V
Environmental QFN48 package
Storage temperature -40 +125 °C
MSL Moisture Sensitivity Level 2
ESD HBM Human Body Model 4kV
ESD CDM Charged Device Model 750 V
Environmental WLCSP package
Storage temperature -40 +125 °C
MSL Moisture Sensitivity Level 1
ESD HBM Human Body Model 4 kV
ESD CDM Charged Device Model 500 V
Flash memory
Endurance 20 0001
1. Flash endurance is 20,000 erase cycles. The smallest element of flash that can be written is a 32 bit word.
write/erase cycles
Retention 10 years at 40 °C
50 years at 25 °C
Number of times an address
can be written between
erase cycles
2times
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nRF51422 Product Specification v3.2
7 Operating conditions
The operating conditions are the physical parameters that the chip can operate within as defined in
Table 20.
Table 20 Operating conditions
Nominal operating conditions (NOC) - conditions under which the chip is operated and tested are the
typical (Typ.) values in Table 20.
Extreme operating conditions (EOC) - conditions under which the chip is operated and tested are the
minimum (Min.) and maximum (Max.) values in Table 20.
7.1 WLCSP light sensitivity
7.1.1 CDAB, CEAA, and CFAC light sensitivity
The CDAB, CEAA, and CFAC package variants are sensitive to visible and near infrared light which means a
final product design must shield the chip properly. The marking side is covered with a light absorbing film,
while the side edges of the chip and the ball side must be protected by coating or other means.
Symbol Parameter Notes Min. Typ. Max. Units
VDD Supply voltage, internal LDO setup 1.8 3.0 3.6 V
VDD Supply voltage, DC/DC converter setup 2.1 3.0 3.6 V
VDD Supply voltage, low voltage mode
setup 1
1. DEC2 shall be connected to VDD in this mode.
1.75 1.8 1.95 V
tR_VDD Supply rise time (0 V to VDD) 2
2. The on-chip power-on reset circuitry may not function properly for rise times outside the specified interval.
100 ms
TAOperating temperature -25 25 75 °C
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nRF51422 Product Specification v3.2
8 Electrical specifications
This chapter contains electrical specifications for device interfaces and peripherals including radio
parameters and current consumption.
The test levels referenced are defined in Table 21.
Table 21 Test level definitions
8.1 Clock sources
8.1.1 16/32 MHz crystal startup
Figure 9 Current drawn at oscillator startup
Figure 9 shows the current drawn by the crystal oscillator (XOSC) at startup. The tSTART,XOSC period is the
time needed for the oscillator to start clocking. The length of tSTART,XOSC is dependent on the crystal
specifications.
The period following tSTART,XOSC to the end of tSTART,X16M /tSTART,X32M is fixed. This is the debounce period
where the clock stabilizes before it is made available to rest of the system.
Test level Description
1Simulated, calculated, by design (specification limit) or prototype samples
tested at NOC.
2Parameters have been verified at Test level 1 and in addition:
Prototype samples tested at EOC.
3Parameters have been verified at Test level 2 and in addition:
Production samples tested at EOC in accordance with JEDEC47.
4Parameters have been verified at Test level 3 and in addition:
Production devices are limit tested at NOC.
tSTART,XOSC
tSTART,X16M/tSTART,X32M
ISTART,XOSC
Enable XOSC
XOSC Ready
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nRF51422 Product Specification v3.2
8.1.2 16 MHz crystal oscillator (16M XOSC)
Table 22 16 MHz crystal oscillator
Symbol Description Note Min. Typ. Max. Units Test
level
fNOM,X16M Crystal frequency. 16 MHz N/A
fTOL,X16M,ANT Frequency tolerance, ANT.1
1. The Frequency tolerance relates to the amount of time the radio can be in transmit mode. See Table 38 on page 51.
±502
2. Includes initial tolerance of the crystal, drift over temperature, aging, and frequency pulling due to incorrect load capac-
itance.
ppm N/A
fTOL,X16M,BLE
Frequency tolerance, Bluetooth low
energy applications.1±402ppm N/A
RS,X16M Equivalent series resistance.
C0 ≤ 7 pF, CL,MAX ≤ 16 pF
C0 ≤ 5 pF, CL,MAX ≤ 12 pF
C0 ≤ 3 pF, CL,MAX ≤ 12 pF
50
75
100
100
150
200
N/A
N/A
N/A
PD,X16M Drive level. 100 µW N/A
Cpin Input capacitance on XC1 and XC2
pads. 4pF 1
IX16M Run current for 16 MHz crystal
oscillator. SMD 2520 CL = 8 pF 4703
3. This number includes the current used by the automated power and clock management system.
µA 1
IX16M,1M
Run current for the 16 MHz crystal
oscillator when used only for a Timer
at 1 MHz or less.
SMD 2520 CL = 8pF 2503µA 1
ISTBY,X16M
Standby current for 16 MHz crystal
oscillator.4
4. Standby current is the current drawn by the oscillator when there are no resources requesting the 16M, meaning there
is no clock management active (see Table 33 on page 48). This value will depend on type of crystal.
SMD 2520 CL = 8 pF 25 µA 1
ISTART,XOSC Startup current for 16 MHz crystal
oscillator. 1.1 mA 3
tSTART,XOSC Startup time for 16 MHz crystal
oscillator. SMD 2520 CL = 8 pF 400 5005
5. Crystals with other specification than SMD 2520 may have much longer startup times.
µs 2
tSTART,X16M
Total startup time
(tSTART,XOSC + debounce period).6
6. This is the time from when the crystal oscillator is powered up until its output becomes available to the system. It
includes both the crystal startup time and the debounce period.
SMD 2520 CL = 8 pF 800 µs 1
VINEXTCLK
Input amplitude if driven by external
clock applied to XC1 pin.7
7. Leave XC2 pin unconnected.
800 8
8. Input signal must not swing outside supply rails.
mV pp 1
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nRF51422 Product Specification v3.2
8.1.3 32 MHz crystal oscillator (32M XOSC)
Table 23 32 MHz crystal oscillator
Symbol Description Note Min. Typ. Max. Units Test
level
fNOM,X32M Crystal frequency. 32 MHz N/A
fTOL,X32M,ANT Frequency tolerance, ANT.1
1. The Frequency tolerance relates to the amount of time the radio can be in transmit mode. See Table 38 on page 51.
±502
2. Includes initial tolerance of the crystal, drift over temperature, aging and frequency pulling due to incorrect load capac-
itance.
ppm N/A
fTOL,X32M,BLE
Frequency tolerance, Bluetooth low
energy applications.1±402ppm N/A
RS,X32M Equivalent series resistance.
C0 ≤ 7 pF, CL,MAX ≤ 12 pF
C0 ≤ 5 pF, CL,MAX ≤ 12 pF
C0 ≤ 3 pF, CL,MAX ≤ 9 pF
30
40
50
60
80
100
N/A
N/A
N/A
PD,X32M Drive level. 100 µW N/A
Cpin Input capacitance on XC1 and XC2
pads. 4pF 1
IX32M Run current for 32 MHz crystal
oscillator. SMD 2520 CL = 8 pF 5003
3. This number includes the current used by the automated power and clock management system.
µA 1
IX32M,1M
Run current for the 32 MHz crystal
oscillator when used only for a
Timer at 1 MHz or less.
SMD 2520 CL = 8 pF 3003µA 1
ISTBY,X32M
Standby current for 32 MHz crystal
oscillator.4
4. Standby current is the current drawn by the oscillator when there are no resources requesting the 32M, meaning there
is no clock management active (see Table 33 on page 48). This value will depend on type of crystal.
SMD 2520 CL = 8 pF 30 µA 1
ISTART,XOSC Startup current for 32 MHz crystal
oscillator. 1.1 mA 3
tSTART,XOSC Startup time for 32 MHz crystal
oscillator. SMD 2520 CL = 8 pF 300 4005
5. Crystals with other specification than SMD 2520 may have much longer startup times.
µs 1
tSTART,X32M
Total startup time
(tSTART,XOSC + debounce period).6
6. This is the time from when the crystal oscillator is powered up until its output becomes available to the system. It
includes both the crystal startup time and the debounce period.
SMD 2520 CL = 8 pF 750 µs 1
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nRF51422 Product Specification v3.2
8.1.4 16 MHz RC oscillator (16M RCOSC)
Table 24 16 MHz RC oscillator
8.1.5 32.768 kHz crystal oscillator (32k XOSC)
Table 25 32.768 kHz crystal oscillator
Symbol Description Min. Typ. Max. Units Test
level
fNOM,RC16M Nominal frequency. 16 MHz N/A
fTOL,RC16M Frequency tolerance. ±1 ±5 % 3
IRC16M Run current for 16 MHz RC oscillator. 7501
1. This number includes the current used by the automated power and clock management system.
µA 1
IRC16M,1M Run current for 16 MHz RCOSC when used only for a
Timer at 1 MHz or less. 5401µA 1
tSTART,RC16M Startup time for 16 MHz RC oscillator. 4.2 5.2 µs 1
IRC16M, START Startup current for 16 MHz RC oscillator. 400 µA 1
Symbol Description Min. Typ. Max. Units Test
level
fNOM,X32k Crystal frequency. 32.768 kHz N/A
fTOL,X32k,BLE Frequency tolerance, Bluetooth low energy
applications. ±250 ppm N/A
fTOL,X32k,ANT Frequency tolerance, ANT applications. ±50 ppm N/A
CL,X32k Load capacitance. 12.5 pF N/A
C0,X32k Shunt capacitance. 2 pF N/A
RS,X32k Equivalent series resistance. 50 80 k N/A
PD,X32k Drive level. 1 µW N/A
Cpin Input capacitance on XL1 and XL2 pads. 4pF 1
IX32k Run current for 32.768 kHz crystal oscillator. 0.7 µA 1
ISTART,X32k Startup current for 32.768 kHz crystal oscillator. 1.3 1.8 µA 1
tSTART,X32k Startup time for 32.768 kHz crystal oscillator. 0.3 1 s 2
VINEXTCLK
Input amplitude if driven by external clock applied to
XL1 pin.1
1. Leave XL2 pin unconnected.
200 6002,3
2. The oscillator run current will increase above 1 μA for higher amplitudes.
3. Input signal must not swing outside supply rails.
mV pp 1
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nRF51422 Product Specification v3.2
8.1.6 32.768 kHz RC oscillator (32k RCOSC)
Table 26 32.768 kHz RC oscillator
Note: The ANT protocol stack requires an accuracy of ±50 ppm, thus the 32.768 kHz RC oscillator
must not be used when running the ANT stack.
8.1.7 32.768 kHz Synthesized oscillator (32k SYNT)
Table 27 32.768 kHz Synthesized oscillator
Symbol Description Note Min. Typ. Max. Units Test
level
fNOM,RC32k Nominal frequency. 32.768 kHz N/A
fTOL,RC32k Frequency tolerance. ±2 % 3
fTOL,CAL,RC32k Frequency tolerance. Calibration interval 4 s ±250 ppm 1
IRC32k Run current. 1.3 1.5 µA 1
tSTART,RC32k Startup time. 390 487 µs 1
Symbol Description Note Min. Typ. Max. Units Test
level
fNOM,SYNT32k Nominal frequency. 32.768 kHz 1
fTOL,SYNT Frequency tolerance.
The ANT protocol stack
requires an accuracy of
±50 ppm on the
32.768 kHz clock.
fTOL,XO16M ±8
fTOL,XO32M ±8 ppm 1
ISYNT32k
Run and startup current for
32.768 kHz Synthesized clock
including the 16M XOSC.
15 µA 1
tSTART,SYNT32k Startup time for 32.768 kHz
Synthesized clock. 406 µs 1
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nRF51422 Product Specification v3.2
8.2 Power management
Table 28 Power Fail Comparator
Table 29 Pin Reset
Symbol Description Note Min. Typ. Max. Units Test
level
VPOF Nominal power level warning
thresholds (falling supply voltage). Accuracy as defined by VTOL
2.1
2.3
2.5
2.7
V2
VTOL Threshold voltage tolerance. ±5 % 3
VHYST Threshold voltage hysteresis.
VPOF = 2.1 V
VPOF = 2.3 V
VPOF = 2.5 V
VPOF = 2.7 V
46
62
79
100
mV 3
Symbol Description Min. Typ. Max. Units Test
level
tHOLDRESETNORMAL Hold time for reset pin when doing a pin reset.1
1. SWDCLK pin must be kept low during reset.
0.2 µs 1
tHOLDRESETDEBUG
Hold time for reset pin when doing a pin reset
during debug.1,2
2. Bit 0 in the RESET register in the power management module must be set to 1 to enable reset during debug.
100 µs 1
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nRF51422 Product Specification v3.2
Power on reset time (tPOR) is the time from when the supply starts rising to when the device comes out of
reset and the CPU starts. The time increases with, and is inclusive of, supply rise time from 0 V to VDD.
Table 30 gives tPOR for a number of supply rise times, simulated with a linear ramp from 0 V to VDD, over the
supply voltage range 1.8 V to 3.6 V.
Table 30 Power on reset time
The data in Figure 10 and Table 31 show measured t_POR data. Measurements were taken using the
reference circuit shown in Section 11.3.1 “QFAA QFN48 schematic with internal LDO setup” on page 79 with
the given supply voltage and temperature conditions.
Figure 10 Power on reset time (Test level 2)
Table 31 Supply rise time at sample voltages for the measured data shown in Figure 10.
Symbol Description Note Min. Typ. Max. Units Test
level
tPOR, 10 µs Power on reset time, 10 µs rise
time (0 V to VDD). 0.7 2.4 19 ms 1
tPOR, 1 ms Power on reset time, 1 ms rise
time (0 V to VDD). 1.7 3.4 20 ms 1
tPOR, 10 ms Power on reset time, 10 ms rise
time (0 V to VDD). 11 12 28 ms 1
tPOR, 100 ms Power on reset time, 100 ms rise
time (0 V to VDD). 68 101 115 ms 1
VDD Rise Time from 10% to 90% of VDD
1.8 570 µs
3.0 605 µs
3.6 635 µs
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nRF51422 Product Specification v3.2
Symbol Description Note Min. Typ. Max. Units Test
level
IOFF Current in SYSTEM OFF, no RAM
retention. 0.61µA 2
IOFF, RET, 8k
Additional current in SYSTEM
OFF per retained RAM block
(8 kB).
0.61µA 2
IOFF2ON OFF to CPU execute
transition current. 400 µA 1
tOFF2ON OFF to CPU execute. 9.6 10.6 µs 1
ION,16k SYSTEM-ON base current with
16 kB RAM enabled. 2.61µA 2
ION,32k SYSTEM-ON base current with
32 kB RAM enabled. 3.81µA 2
t1V2 Startup time for 1V2 regulator. 2.3 µs 1
I1V2XO16
Current drawn by 1V2 regulator
and 16 MHz XOSC when both
are on at the same time.
See Table 33 on page 48.8102µA 1
I1V2XO32
Current drawn by 1V2 regulator
and 32 MHz XOSC when both
are on at the same time.
See Table 33 on page 48. 8402µA 1
I1V2RC16
Current drawn by 1V2 regulator
and 16 MHz RCOSC when both
are on at the same time.
See Table 33 on page 48.8802µA 1
I1V2XO16,1M
For HFCLK in 1 MHz mode3.
Current drawn by 1V2 regulator
and 16 MHz XOSC when both
are on at the same time.
See Table 33 on page 48.5202µA 1
I1V2XO32,1M
For HFCLK in 1 MHz mode3.
Current drawn by 1V2 regulator
and 32 MHz XOSC when both
are on at the same time.
See Table 33 on page 48.5602µA 1
I1V2RC16,1M
For HFCLK in 1 MHz mode3.
Current drawn by 1V2 regulator
and 16 MHz RCOSC when both
are on at the same time.
See Table 33 on page 48.6302µA 1
tXO
Startup time for the clock
management system when the
XTAL is in standby.
2.3 5.3 µs 1
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nRF51422 Product Specification v3.2
Table 32 Power management
t1V7 Startup time for 1V7 regulator. 2 3.6 µs 1
I1V7 Current drawn by 1V7 regulator. 105 µA 2
FDCDC DC/DC converter current
conversion factor. 0.6541.241
1. Add 1 μA to the current value if the device is used in Low voltage mode.
2. This number includes the current used by the automated power and clock management system.
3. For details on 1 MHz mode, see Section 4.2 “Timer/counters (TIMER)” on page 32.
4. FDCDC will vary depending on VDD and internal radio current consumption (IDD). Please refer to the nRF51 Series Refer-
ence Manual, v3.0 or later, for a method to calculate IDD,DCDC. See Figure 11 on page 50 for a DC/DC conversion factor
chart.
Symbol Description Note Min. Typ. Max. Units Test
level
Page 48
nRF51422 Product Specification v3.2
8.3 Block resource requirements
Table 33 Clock and power requirements for different blocks
8.4 CPU
Table 34 CPU specifications
Block ID
Resource requirements
Comment
1V2 HFCLK1
1. HFCLK could be one of the following; RC16M, XO16M, or XO32M.
LFCLK 1V7
Radio 1 x x Requires HFCLK XOSC.
UART 2 x x When receiver or transmitter are
STARTed.
SPIS 4 x x Requested when CSN asserts.
SPI 3, 4 x x
TWI 3, 4 x x
GPIOTE 6 x x Only in input mode.
ADC 7 x x Requires HFCLK XOSC.
TIMER 8, 9, 10 xRequires 1V2 when a TIMER EVENT is
triggered.
RTC 11, 17 x HFCLK will be requested if the LFCLK is
synthesized from HFCLK.
TEMP 12 x x Requires HFCLK XOSC.
RNG 13 x x
ECB 14 x x
WDT 16 x HFCLK will be requested if the LFCLK is
synthesized from HFCLK.
QDEC 18 x x
LPCOMP 19 No resources required.
CPU -- x x x
Symbol Description Min. Typ. Max. Units Test
level
ICPU, FLASH Run current at 16 MHz (XOSC).
Executing code from flash memory. 4.11
1. Includes CPU, flash, 1V2, 1V7, RC16M.
mA 2
ICPU, RAM Run current at 16 MHz (XOSC).
Executing code from RAM. 2.42
2. Includes CPU, RAM, 1V2, RC16M.
mA 1
ISTART, CPU CPU startup current. 600 µA 1
tSTART, CPU IDLE to CPU execute. 03
3. t1V2 if 1V2 regulator is not running already.
µs 1
Page 49
nRF51422 Product Specification v3.2
8.5 Radio transceiver
8.5.1 General radio characteristics
Table 35 General radio characteristics
8.5.2 Radio current consumption with DC/DC disabled
Table 36 Radio current consumption with DC/DC disabled (NOC, VDD = 3 V)
Symbol Description Note Min. Typ. Max. Units Test
level
fOP Operating frequencies. 1 MHz channel
spacing. 2400 2483 MHz N/A
PLLres PLL programming resolution. 1MHz N/A
∆f250 Frequency deviation at 250 kbps. ±170 kHz 2
∆f1M Frequency deviation at 1 Mbps. ±170 kHz 2
∆f2M Frequency deviation at 2 Mbps. ±320 kHz 2
∆fBLE Frequency deviation at BLE. ±225 ±250 ±275 kHz 4
bpsFSK On-air data rate. 250 2000 kbps N/A
Symbol Description Note Min. Typ. Max. Units Test
level
ITX,+4dBm TX only run current at POUT = +4 dBm. 1
1. Valid for data rates 250 kbps, 1 Mbps, and 2 Mbps.
16 mA 4
ITX,0dBm TX only run current at POUT = 0 dBm. 110.5 mA 4
ITX,-4dBm TX only run current at POUT = -4 dBm. 18mA2
ITX,-8dBm TX only run current at POUT = -8 dBm. 17mA 2
ITX,-12dBm TX only run current at POUT = -12 dBm. 16.5 mA 2
ITX,-16dBm TX only run current at POUT = -16 dBm. 16mA 2
ITX,-20dBm TX only run current at POUT = -20 dBm. 15.5 mA 2
ITX,-30dBm TX only run current at POUT = -30 dBm. 15.5 mA 2
ISTART,TX TX startup current. 2
2. Average current consumption (at 0 dBm TX output power) for TX startup (130 μs), and when changing mode from RX to
TX (130 μs).
7mA1
IRX,250 RX only run current at 250 kbps. 12.6 mA 1
IRX,1M RX only run current at 1 Mbps. 13 mA 4
IRX,2M RX only run current at 2 Mbps. 13.4 mA 1
ISTART,RX RX startup current. 3
3. Average current consumption for RX startup (130 μs), and when changing mode from TX to RX (130 μs).
8.7 mA 1
Page 50
nRF51422 Product Specification v3.2
8.5.3 Radio current consumption with DC/DC enabled
Table 37 Radio current consumption with DC/DC enabled (NOC, VDD = 3 V)
Figure 11 DC/DC conversion factor as function of VDD
See chapter 12 Power management in the nRF51 Series Reference Manual on how to use the DC/DC
conversion factor to calculate the actual power consumption.
Symbol Description Note Min. Typ. Max. Units Test
level
ITX,+4dBm TX only run current at POUT = +4 dBm. 1
1. Valid for data rates 250 kbps, 1 Mbps, and 2 Mbps.
11.8 mA 2
ITX,0dBm TX only run current at POUT = 0 dBm. 18.0 mA 2
ITX,-4dBm TX only run current at POUT = -4 dBm. 16.3 mA 2
ITX,-8dBm TX only run current at POUT = -8 dBm. 15.6 mA 2
ITX,-12dBm TX only run current at POUT = -12 dBm. 15.3 mA 2
ITX,-16dBm TX only run current at POUT = -16 dBm. 15.0 mA 2
ITX,-20dBm TX only run current at POUT = -20 dBm. 14.7 mA 2
ITX,-30dBm TX only run current at POUT = -30 dBm. 14.7 mA 2
IRX,1M RX only run current at 1 Mbps. 9.7 mA 2
0,600
0,700
0,800
0,900
1,000
1,100
2,1 2,3 2,5 2,7 2,9 3,1 3,3 3,5
Tx - 1 Mbps (-12 dBm)
Tx - 1 Mbps (0 dBm)
Rx - 1 Mbps
Tx - 1 Mbps (+4 dBm)
DC/DC conversion Factor
Supply Voltage (VDD)
Conversion Factor (FDCDC)
Page 51
nRF51422 Product Specification v3.2
8.5.4 Transmitter specifications
Table 38 Transmitter specifications
Symbol Description Min. Typ. Max. Units Test
level
PRF Maximum output power. 4 dBm 4
PRFC RF power control range. 20 24 dB 2
PRFCR RF power accuracy. ±4 dB 1
PWHISP RF power whisper mode. -30 dBm 2
PBW2 20 dB bandwidth for modulated carrier (2 Mbps). 1800 2000 kHz 2
PBW1 20 dB bandwidth for modulated carrier (1 Mbps). 950 1100 kHz 2
PBW250 20 dB bandwidth for modulated carrier (250 kbps). 700 800 kHz 2
PRF1.2 1st Adjacent Channel Transmit Power.
±2 MHz (2 Mbps). -20 dBc 2
PRF2.2 2nd Adjacent Channel Transmit Power.
±4 MHz (2 Mbps). -45 dBc 2
PRF1.1 1st Adjacent Channel Transmit Power.
±1 MHz (1 Mbps). -20 dBc 2
PRF2.1 2nd Adjacent Channel Transmit Power.
±2 MHz (1 Mbps). -40 dBc 2
PRF1.250 1st Adjacent Channel Transmit Power.
±1 MHz (250 kbps). -25 dBc 2
PRF2.250 2nd Adjacent Channel Transmit Power.
±2 MHz (250 kbps). -40 dBc 2
tTX,30
Maximum consecutive transmission time,
fTOL < ±30 ppm. 16 ms 1
tTX,60
Maximum consecutive transmission time,
fTOL < ±60 ppm. 4ms 1
Page 52
nRF51422 Product Specification v3.2
8.5.5 Receiver specifications
Symbol Description Min. Typ. Max. Units Test
level
Receiver operation
PRXMAX Maximum received signal strength at
< 0.1% PER. 0dBm 1
PRXSENS,2M Sensitivity (0.1% BER)
at 2 Mbps. -85 dBm 2
PRXSENS,1M Sensitivity (0.1% BER)
at 1 Mbps. -90 dBm 2
PRXSENS,250k Sensitivity (0.1% BER)
at 250 kbps. -96 dBm 2
PSENS IT
1 Mbps BLE
Receiver sensitivity:
Ideal transmitter. -93 dBm 2
PSENS DT
1 Mbps BLE
Receiver sensitivity:
Dirty transmitter.1-91 dBm 2
RX selectivity - modulated interfering signal2
2 Mbps
C/ICO C/I co-channel. 12 dB 2
C/I1ST 1st ACS, C/I 2 MHz. -4 dB 2
C/I2ND 2nd ACS, C/I 4 MHz. -24 dB 2
C/I3RD 3rd ACS, C/I 6 MHz. -28 dB 2
C/I6th 6th ACS, C/I 12 MHz. -44 dB 2
C/INth Nth ACS, C/I fi > 25 MHz. -50 dB 2
1 Mbps/ANT
C/ICO C/I co-channel (1 Mbps). 12 dB 2
C/I1ST 1st ACS, C/I 1 MHz. 4dB 2
C/I2ND 2nd ACS, C/I 2 MHz. -24 dB 2
C/I3RD 3rd ACS, C/I 3 MHz. -30 dB 2
C/I6th 6th ACS, C/I 6 MHz. -40 dB 2
C/I12th 12th ACS, C/I 12 MHz. -50 dB 2
C/INth Nth ACS, C/I fi > 25 MHz. -53 dB 2
Page 53
nRF51422 Product Specification v3.2
Table 39 Receiver specifications
250 kbps
C/ICO C/I co-channel. 4 dB 2
C/I1ST 1st ACS, C/I 1 MHz. -10 dB 2
C/I2ND 2nd ACS, C/I 2 MHz. -34 dB 2
C/I3RD 3rd ACS, C/I 3 MHz. -39 dB 2
C/I6th 6th ACS, C/I fi > 6 MHz. -50 dB 2
C/I12th 12th ACS, C/I 12 MHz. -55 dB 2
C/INth Nth ACS, C/I fi > 25 MHz. -60 dB 2
Bluetooth Low Energy RX selectivity
C/ICO C/I co-channel. 10 dB 2
C/I1ST 1st ACS, C/I 1 MHz. 1dB 2
C/I2ND 2nd ACS, C/I 2 MHz. -25 dB 2
C/I3+N ACS, C/I (3+n) MHz offset [n = 0, 1, 2, . . .]. -51 dB 2
C/IImage lmage blocking level. -30 dB 2
C/IImage±1MHz Adjacent channel to image blocking level (±1 MHz). -31 dB 2
RX intermodulation3
P_IMD2Mbps IMD performance, 2 Mbps,
3rd, 4th, and 5th offset channel. -41 dBm 2
P_IMD1Mbps IMD performance, 1 Mbps,
3rd, 4th, and 5th offset channel. -40 dBm 2
P_IMD250kbps IMD performance, 250 kbps,
3rd, 4th, and 5th offset channel. -36 dBm 2
P_IMDBLE IMD performance, 1 Mbps BLE,
3rd, 4th, and 5th offset channel. -39 dBm 2
1. As defined in the Bluetooth Core Specification v4.0 Volume 6: Core System Package (Low Energy Controller Volume).
2. Wanted signal level at PIN = -67 dBm. One interferer is used, having equal modulation as the wanted signal. The input
power of the interferer where the sensitivity equals BER = 0.1% is presented.
3. Wanted signal level at PIN = -64 dBm. Two interferers with equal input power are used. The interferer closest in fre-
quency is not modulated, the other interferer is modulated equal with the wanted signal. The input power of interferers
where the sensitivity equals BER = 0.1% is presented.
Symbol Description Min. Typ. Max. Units Test
level
Page 54
nRF51422 Product Specification v3.2
8.5.6 Radio timing parameters
Table 40 Radio timing
8.5.7 Antenna matching network requirements
Table 41 Optimum differential load impedance
8.6 Received Signal Strength Indicator (RSSI) specifications
Table 42 RSSI specifications
Symbol Description 250 k 1 M 2 M BLE Jitter Units
tTXEN Time between TXEN task and READY event. 132 132 132 140 0 µs
tTXDISABLE Time between DISABLE task and DISABLED
event when the radio was in TX. 10 4 3 4 1 µs
tRXEN Time between the RXEN task and READY event. 130 130 130 138 0 µs
tRXDISABLE Time between DISABLE task and DISABLED
event when the radio was in RX. 00001µs
tTXCHAIN TX chain delay. 5 1 0.5 1 0 µs
tRXCHAIN RX chain delay. 12.5 3 2 3 0 µs
Symbol Description Min. Typ. Max. Units Test
level
ZQFN48,ANT1,2
Optimum differential impedance at 2.4 GHz seen
into the matching network from pin ANT1 and
ANT2 on the QFN48 packet.
15 + j85 1
ZWLCSP,ANT1,2
Optimum differential impedance at 2.4 GHz seen
into the matching network from pin ANT1 and
ANT2 on the WLCSP packet.
12.6 + j106 1
Symbol Description Note Min. Typ. Max. Units Test
level
RSSIACC RSSI accuracy. Valid range
-50 dBm to -80 dBm. ±6 dB 2
RSSIRESOLUTION RSSI resolution. 1dB 1
RSSIPERIOD Sample period. 8.8 µs 1
RSSICURRENT
Current consumption in
addition to IRX.250 µA 1
Page 55
nRF51422 Product Specification v3.2
8.7 Universal Asynchronous Receiver/Transmitter (UART) specifications
Table 43 UART specifications
Symbol Description Note Min. Typ. Max. Units Test
level
IUART1M Run current at max baud rate. 230 µA1
IUART115k Run current at 115200 bps. 220 µA 1
IUART1k2 Run current at 1200 bps. 210 µA 1
fUART Baud rate for UART. 1.2 1000 kbps N/A
tCTSH CTS high time. 1 µs 1
Page 56
nRF51422 Product Specification v3.2
8.8 Serial Peripheral Interface Slave (SPIS) specifications
Table 44 SPIS specifications
Figure 12 SPIS timing diagram, one byte transmission, SPI Mode 0
Table 45 SPIS timing parameters
Symbol Description Min. Typ. Max. Units Test
level
ISPIS125K Run current for SPI slave at 125 kbps.1
1. CSN asserted.
180 µA 1
ISPIS2M Run current for SPI slave at 2 Mbps.1183 µA 1
fSPIS Bit rates for SPIS. 0.125 42
2. This bit rate is only possible if the instructions are followed in Section 4.10.1 “Enable 4 Mbps SPIS bit rate” on
page 34.
Mbps N/A
Symbol Description Note Min. Typ. Max. Units Test
level
tDC Data to SCK setup. 10 ns 1
tDH SCK to data hold. 10 ns 1
tCSD CSN to data valid. Low power mode.1
Constant latency mode.1
1. For more information on how to control the sub power modes, see the nRF51 Series Reference Manual.
7100
2100 ns 1
tCD SCK to data valid. CLOAD = 10 pF 972
2. Increases/decreases with 1.2 ns/pF load.
ns 1
tCL SCK low time. 40 ns 1
tCH SCK high time. 40 ns 1
tCC CSN to SCK setup. Low power mode.1
Constant latency mode.1
7000
2000 ns 1
tCCH Last SCK edge to CSN hold. 2000 ns 1
tCWH CSN inactive time. 300 ns 1
tCDZ CSN to output high Z. 40 ns 1
fSCK SCK frequency. 0.125 2 MHz 1
tR,tFSCK rise and fall time. 100 ns 1
b7b6b0
b7b0
tCD
tDH
tDC
tCL
tCH
SCK
MOSI
MISO
CSN
tCWH
tCDZ
tCCH
tCSD
tCC
Page 57
nRF51422 Product Specification v3.2
8.9 Serial Peripheral Interface (SPI) Master specifications
Table 46 SPI specifications
Figure 13 SPI timing diagram, one byte transmission, SPI mode 0
Table 47 SPI timing parameters
Symbol Description Min. Typ. Max. Units Test
level
ISPI125K Run current for SPI master at 125 kbps. 180 µA 1
ISPI4M Run current for SPI master at 4 Mbps. 200 µA 1
fSPI Bit rates for SPI. 0.125 4 Mbps N/A
Symbol Description Note Min. Typ. Max. Units Test
level
tDC Data to SCK setup. 10 ns 1
tDH SCK to data hold. 10 ns 1
tCD SCK to data valid. CLOAD = 10 pF 971
1. Increases/decreases with 1.2 ns/pF load.
ns 1
tCL SCK low time. 40 ns 1
tCH SCK high time. 40 ns 1
fSCK SCK frequency. 0.125 4MHz 1
tR,tFSCK rise and fall time. 100 ns 1
b7b6b0
b7b0
tCD
tDH
tDC
tCL
tCH
SCK
MISO
MOSI
Page 58
nRF51422 Product Specification v3.2
8.10 I2C compatible Two Wire Interface (TWI) specifications
Table 48 TWI specifications
Figure 14 SCL/SDA timing
Table 49 TWI timing parameters
Symbol Description Note Min. Typ. Max. Units Test
level
I2W100K Run current for TWI at 100 kbps. 380 µA 1
I2W400K Run current for TWI at 400 kbps. 400 µA 1
f2W Bit rates for TWI. 100 400 kbps N/A
tTWI,START Time from STARTRX/STARTTX task is
given until start condition.
Low power mode.1
Constant latency mode.1
1. For more information on how to control the sub power modes, see the nRF51 Series Reference Manual.
3
1
4.4 µs 1
Symbol Description Standard
Min. Max.
Fast
Min. Max. Units Test
level
fSCL SCL clock frequency. 100 400 kHz 1
tHD_STA Hold time for START and repeated
START condition. 5200 1300 ns 1
tSU_DAT Data setup time before positive
edge on SCL. 300 300 ns 1
tHD_DAT Data hold time after negative
edge on SCL. 300 300 ns 1
tSU_STO Setup time from SCL goes high
to STOP condition. 5200 1300 ns 1
tBUF Bus free time between STOP and
START conditions. 4700 1300 ns 1
1/fSCL
SCL
SDA
tHD_SDA
tSU_DAT
tHD_DAT tBUF
tSU_STO
Page 59
nRF51422 Product Specification v3.2
8.11 GPIO Tasks and Events (GPIOTE) specifications
Table 50 GPIOTE specifications
Note: Setting up one or more GPIO DETECT signals to generate PORT EVENT, which can be used
either as a wakeup source or to give an interrupt, will not lead to an increase of the current
consumption.
Symbol Description Min. Typ. Max. Units Test
level
IGPIOTE,IN Run current with 1 or more GPIOTE active channels
in Input mode. 22 µA 1
IGPIOTE,OUT Run current with 1 or more GPIOTE active channels
in Output mode. 0.1 µA 1
IGPIOTE,IDLE
Run current when all channels are in Idle mode.
PORT event can be generated with a delay of up to
t1V2.
0.1 µA 1
Page 60
nRF51422 Product Specification v3.2
8.12 Analog to Digital Converter (ADC) specifications
Note: HFCLK XOSC is required to get the stated ADC accuracy.
Table 51 Analog to Digital Converter (ADC) specifications
Symbol Description Note Min. Typ. Max. Units Test
level
DNL10b Differential non-linearity
(10 bit mode). < 1 LSB 2
INL10b Integral non-linearity
(10 bit mode). 2LSB 2
VOS Offset error. -2 +2 % 2
eGGain error. 1
1. Source impedance less than 5 k.
-2 +2 % 2
VREF_VBG Internal Band Gap reference
voltage (VBG). 1.20 V V 2
VREF_VBG_ERR Internal Band Gap reference
voltage error. -1.5 +1.5 % 2
TCREF_VBG_DRIFT Internal Band Gap reference
voltage drift. -200 +200 ppm/°C 2
VREF_EXT External reference voltage
(AREF0/1). 0.83 1.2 1.3 V 1
VREF_VDD_LIM
Limited supply voltage range for
ADC using VDD with prescaler as
the reference.
CONFIG.REFSEL =
SupplyOneHalfPrescaling
CONFIG.REFSEL =
SupplyOneThirdPrescaling
1.7
2.5
2.6
3.6
V
V
1
1
tADC10b Time required to convert a single
sample in 10 bit mode. 68 µs 1
tADC9b Time required to convert a single
sample in 9 bit mode. 36 µs 1
tADC8b Time required to convert a single
sample in 8 bit mode. 20 µs 1
IADC Current drawn by ADC during
conversion. 260 µA 1
ADC_ERR_1V8
Absolute error when used for
battery measurement at
1.8 V, 2.2 V, 2.6 V, 3.0 V, and
3.4 V.
2
2. Internal reference, input from VDD/3, 10 bit mode.
3LSB 2
ADC_ERR_2V2 2LSB 2
ADC_ERR_2V6 1LSB 2
ADC_ERR_3V0 1LSB 2
ADC_ERR_3V4 1LSB 2
Page 61
nRF51422 Product Specification v3.2
8.13 Timer (TIMER) specifications
Table 52 Timer specifications
8.14 Real Time Counter (RTC)
Table 53 RTC
8.15 Temperature sensor (TEMP)
Note: HFCLK XOSC is required to get the stated accuracy.
Table 54 Temperature sensor
Symbol Description Note Min. Typ. Max. Units Test
level
ITIMER0/1/2 Timer current when running from
HFCLK in 16 MHz mode. 30 µA 1
ITIMER0/1/2,1M Timer current when running from
HFCLK in 1 MHz mode. 4µA 1
tTIMER,START Time from START task is given
until timer starts counting. 0.25 µs 1
Symbol Description Min. Typ. Max. Units Test
level
IRTC Timer (LFCLK source). 0.1 µA 1
Symbol Description Min. Typ. Max. Units Test
level
ITEMP Run current for Temperature sensor. 185 µA 1
tTEMP Time required for temperature
measurement. 35 µs 1
TRANGE Temperature sensor range. -25 75 °C N/A
TACC Temperature sensor accuracy.1
1. Stated temperature accuracy is valid in the range 0 to 60°C.
Temperature accuracy outside the 0 to 60°C range is ± 8°C.
-4 +4 °C N/A
TRES Temperature sensor resolution. 0.25 °C 1
Page 62
nRF51422 Product Specification v3.2
8.16 Random Number Generator (RNG) specifications
Table 55 Random Number Generator (RNG) specifications
8.17 AES Electronic Codebook Mode Encryption (ECB)specifications
Table 56 ECB specifications
8.18 AES CCM Mode Encryption (CCM) specifications
Table 57 CCM specifications
8.19 Accelerated Address Resolver (AAR) specifications
Table 58 AAR specifications
Symbol Description Note Min. Typ. Max. Units Test
level
IRNG Run current at 16 MHz. 60 µA 1
tRNG,RAW Run time per byte in
RAW mode.
Uniform distribution
of 0 and 1 is not
guaranteed.
167 µs 1
tRNG,UNI Run time per byte in
Uniform mode.
Uniform distribution
of 0 and 1 is
guaranteed. Time to
generate a byte
cannot be
guaranteed.
677 µs 1
Symbol Description Min. Typ. Max. Units Test
level
IECB Run current for ECB. 550 µA 1
tSTARTECB, ENDECB Time for a 16 byte AES block encrypt. 8.5 17 µs 1
Symbol Description Min. Typ. Max. Units Test
level
ICCM Run current for CCM. 550 µA 1
Symbol Description Min. Typ. Max. Units Test
level
IAAR Run current for AAR. 550 µA 1
tSTART,RESOLVED Time for address resolution of 8 IRKs. 68 µs 1
Page 63
nRF51422 Product Specification v3.2
8.20 Watchdog Timer (WDT) specifications
Table 59 Watchdog Timer specifications
8.21 Quadrature Decoder (QDEC) specifications
Table 60 Quadrature Decoder specifications
Symbol Description Min. Typ. Max. Units Test
level
IWDT Run current for watchdog timer. 0.1 µA 1
tWDT Time out interval, watchdog timer. 30 µs 36 hrs 1
Symbol Description Note Min. Typ. Max. Units Test
level
IQDEC 12 µA 1
tSAMPLE Time between sampling signals
from Quadrature Decoder. 128 16384 µs N/A
tLED Time from LED is turned on to
signals are sampled.
Only valid for optical
sensors. 0 511 µs N/A
Page 64
nRF51422 Product Specification v3.2
8.22 Non-Volatile Memory Controller (NVMC) specifications
Flash write is performed by executing a program that writes one word (32 bit) consecutively after the other
to the flash memory.
The program performing the flash write operation could be set up to run from flash or from RAM. The timing
of one flash write operation depends on whether the next instructions following the flash write will be
fetched from flash or from RAM. Any fetch from flash before the write operation is finished will give
tWRITE,FLASH timing.
The flash memory is organized in 256 byte rows starting at CODE and UICR start addresses. Crossing from
one row to another will affect the flash write timing when running from RAM.
The time it takes to program the flash memory will depend on different parameters:
• Whether the program doing the flash write is running from RAM or running from flash.
• When running from RAM we will have different timing for:
• First write operation.
• Repeated write operations within the same row.
• Repeated write operation that are crossing from one row to another.
Table 61 NVMC specifications
Symbol Description Note Min. Typ. Max. Units Test
level
tERASEALL Erase flash memory. 1, 2
1. Max timing is assuming using RC16M, worst case tolerance.
2. The CPU will be halted for the duration of NVMC operations if the CPU tries to fetch data/code from the flash memory.
22.3 ms 1
tPAGEERASEALL Erase page in flash memory. 1, 222.3 ms 1
tWRITE,FLASH Program running from flash.
Write one word to flash memory. 1, 3
3. The CPU will be halted for the duration of NVMC operations.
46.3 µs 1
tWRITE,RAM,1st Program running from RAM. Write
the first word to flash memory. 139.3 µs 1
tWRITE,RAM,2nd
Program running from RAM.
Repeated writes operations
following the first, within the
same row.
122.3 µs 1
tWRITE,RAM,3rd
Program running from RAM.
Repeated write operation, new
word is located on a different row
compare to the previous write.
146.3 µs 1
Page 65
nRF51422 Product Specification v3.2
8.23 General Purpose I/O (GPIO) specifications
Table 62 General Purpose I/O (GPIO) specifications
8.24 Low Power Comparator (LPCOMP) specifications
Table 63 Low power comparator specifications
Symbol Parameter (condition) Note Min. Typ. Max. Units
VIH Input high voltage. 0.7 VDD VDD V
VIL Input low voltage. VSS 0.3 VDD V
VOH Output high voltage (std. drive, 0.5 mA). VDD-0.3 VDD V
VOH Output high voltage (high-drive, 5 mA). 1
1. Maximum number of pins with 5 mA high drive is 3.
VDD-0.3 VDD V
VOL Output low voltage (std. drive, 0.5 mA). VSS 0.3 V
VOL Output low voltage (high-drive, 5 mA). VSS 0.3 V
RPU Pull-up resistance. 11 13 16 k
RPD Pull-down resistance. 11 13 16 k
Symbol Description Min. Typ. Max. Units Test
level
ILPC Run current for LPCOMP. 0.5 µA 1
tLPCANADETOFF Time from VIN crossing to ANADETECT signal
generated when in System OFF. 151
1. For 50 mV overdrive
µs 1
tLPCANADETON Time from VIN crossing to ANADETECT signal
generated when in System ON. 151µs 1
tLPCOMPSTARTUP Startup time for the Low Power Comparator. 40 µs 1
Page 66
nRF51422 Product Specification v3.2
9 Mechanical specifications
This chapter covers the mechanical specifications for all chip variants of the nRF51422 chip. The following
table lists the cross references to the package sections describing each package variant.
Table 64 Cross references to package variants
9.1 QFN48 package
Figure 15 QFN48 6 x 6 mm package
Table 65 QFN48 dimensions in millimeters
Package Cross references
QFN48 Section 9.1 “QFN48 package” on page 66
CDAB Section 9.2 “CDAB WLCSP package” on page 67
CEAA Section 9.3 “CEAA WLCSP package” on page 68
CFAC Section 9.4 “CFAC WLCSP package” on page 69
Package AA1 A3 bD, E D2, E2 e K L
QFN48 (6 x 6)
0.80
0.85
0.90
0.00
0.02
0.05
0.2
0.15
0.20
0.25
6.0
4.50
4.60
4.70
0.4
0.20 0.35
0.40
0.45
Min.
Nom.
Max.
Page 67
nRF51422 Product Specification v3.2
9.2 CDAB WLCSP package
Figure 16 CDAB WLCSP package
Table 66 CDAB WLCSP package dimensions in millimeters
Package AA1 A3 b D E D2 E2 e K L
CDAB WLCSP 0.50
0.55
0.12
0.15
0.18
0.33
0.35
0.37
0.16
0.20
0.24
3.45
3.50
3.55
3.28
3.33
3.38
3.2 2.8 0.4 1.41 1.61
Min.
Nom.
Max.
Page 68
nRF51422 Product Specification v3.2
9.3 CEAA WLCSP package
Figure 17 CEAA WLCSP package
Table 67 CEAA WLCSP package dimensions in millimeters
Package AA1 A3 b D E D2 E2 e K L
CEAA WLCSP 0.50
0.55
0.12
0.15
0.18
0.33
0.35
0.37
0.16
0.20
0.24
3.45
3.50
3.55
3.78
3.83
3.88
3.2 3.2 0.4 1.66 1.61
Min.
Nom.
Max.
Page 69
nRF51422 Product Specification v3.2
9.4 CFAC WLCSP package
Figure 18 CFAC WLCSP package
Table 68 CFAC WLCSP package dimensions in millimeters
Package AA1 A3 b D E D2 E2 e K L
CFAC WLCSP 0.50
0.55
0.12
0.15
0.18
0.33
0.35
0.37
0.16
0.20
0.24
3.78
3.83
3.88
3.78
3.83
3.88
3.2 3.2 0.4 1.66 1.78
Min.
Nom.
Max.
Page 70
nRF51422 Product Specification v3.2
10 Ordering information
10.1 Chip marking
Table 69 Package marking
10.2 Inner box label
Figure 19 Inner box label
N51422
<P P> <V V> <H> <P>
<Y Y> <W W> <L L>
P/N#: NRFxxxxx-<PP><VV>-<CC>
Trace Code: <YY><WW><LL>
QTY: <Quantity>
<Box ID> <H><P><F>
Page 71
nRF51422 Product Specification v3.2
10.3 Outer box label
Figure 20 Outer box label
10.4 Order code
Table 70 Order code
nRF51422 -<PP><VV>-<CC>
DEVICE: NRFxxxxx-<PP><VV>-<CC>
Trace Code: <YY><WW><LL>
QTY: <Quantity>
<H><P><F>
S/O No.: <Nordic Sales Order>
CUSTOMER PO No.: <Customer Purchase Order>
WF LOT No.: <Wafer Lot Number>
COUNTRY OF ORIGIN: <Country>
PACKAGE COUNT: PACKAGE WEIGHT:
of KGS
FROM: TO:
Page 72
nRF51422 Product Specification v3.2
10.5 Abbreviations
Table 71 Abbreviations
Abbreviation Definition and implemented codes
N51/nRF51 nRF51 Series product
422 Part code
<PP> Package code
<VV> Variant code
<H><P><F>
Build code
H - Hardware version code
P - Production configuration code (production site, etc.)
F - Firmware version (Only visible on shipping container label)
<YY><WW><LL>
Tracking code
YY - Year code
WW - Assembly week number
LL - Wafer lot code
<CC> Container code
Page 73
nRF51422 Product Specification v3.2
10.6 Code ranges and values
Table 72 Package codes
Table 73 Variant codes
Table 74 Hardware version codes
Table 75 Production version codes
Table 76 Firmware version codes
<PP> Packet Size (mm) Pin/Ball Count Pitch (mm)
QF QFN 6 x 6 48 0.4
CD WLCSP 3.50 x 3.33 56 0.4
CE WLCSP 3.50 x 3.83 62 0.4
CF WLCSP 3.83 x 3.83 62 0.4
<VV> Flash (kB) RAM (kB) DC/DC Bond-out
AA 256 16 YES
AB 128 16 YES
AC 256 32 YES
<H> Description
[A. .Z] Hardware version/revision identifier (incremental).
<P> Description
[0. .9] Production device identifier (incremental).
[A. .Z] Engineering device identifier (incremental).
<F> Description
[A. .N, P. .Z] Version of programmed firmware
[0] Delivered without preprogrammed firmware
Page 74
nRF51422 Product Specification v3.2
Table 77 Year codes
Table 78 Week codes
Table 79 Lot codes
Table 80 Container codes
<YY> Description
[12. .99] Production year: 2012 to 2099
<WW> Description
[1. .52] Week of production
<LL> Description
[AA. .ZZ] Wafer production lot identifier
<CC> Description
R7 7” Reel
R13” Reel
TTray
Page 75
nRF51422 Product Specification v3.2
10.7 Product options
10.7.1 nRF ICs
Table 81 Order code
10.7.2 Development tools
Table 82 Development tools
Order code MOQ1
1. Minimum Order Quantity.
nRF51422-QFAA-R7
nRF51422-QFAB-R7
nRF51422-QFAC-R7
1000
nRF51422-QFAA-R
nRF51422-QFAB-R
nRF51422-QFAC-R
3000
nRF51422-CEAA-R7
nRF51422-CDAB-R7
nRF51422-CFAC-R7
1500
nRF51422-CEAA-R
nRF51422-CDAB-R
nRF51422-CFAC-R
7000
nRF51422-QFAA-T
nRF51422-QFAB-T
nRF51422-QFAC-T
490
Order code Description
nRF51-DK1nRF51 Bluetooth Smart/ANT/2.4 GHz RF Development Kit
nRF51-Dongle1
1. Uses the nRF51422-QFAC version of the chip (capable of running both Bluetooth
low energy and ANT).
nRF51 USB dongle for emulator, sniffer, firmware development
ANT-Dongle ANTUSB-m Stick
Page 76
nRF51422 Product Specification v3.2
11 Reference circuitry
For the following reference layouts, C_pcb1 and C_pcb2, between X1 and XC1/XC2, is estimated to 0.5 pF
each.
The exposed center pad of the QFN48 package must be connected to supply ground for proper device
operation.
11.1 PCB guidelines
A well designed PCB is necessary to achieve good RF performance. A poor layout can lead to loss in
performance or functionality. A qualified RF layout for the IC and its surrounding components, including
matching networks, can be downloaded from the Infocenter.
Follow the schematics and layout references closely for optimal performance. In the case of the antenna
matching circuitry (components between device pins ANT1, ANT2, VDD_PA and the antenna), any changes
to the layout can change the behavior, resulting in degradation of RF performance or a need to change
component values. All the reference circuits are designed for use with a 50 single end antenna.
A PCB with a minimum of two layers, including a ground plane, is recommended for optimal performance.
On PCBs with more than two layers, put a keep-out area on the inner layers directly below the antenna
matching circuitry (components between device pins ANT1, ANT2, VDD_PA, and the antenna) to reduce the
stray capacitances that influence RF performance.
A matching network is needed between the differential RF pins ANT1 and ANT2 and the antenna, to match
the antenna impedance (normally 50 ) to the optimum RF load impedance for the chip. For optimum
performance, the impedance for the matching network should be set as described in Section 8.5.7 “Antenna
matching network requirements” on page 54 along with the recommended QFN48 package reference
circuitry from Section 11.3 “QFAA QFN48 package” on page 79 and WLCSP package reference circuitry from
Section 11.7 “CEAA WLCSP package” on page 103.
The DC supply voltage should be decoupled as close as possible to the VDD pins with high performance RF
capacitors. See the schematics for recommended decoupling capacitor values. The supply voltage for the
chip should be filtered and routed separately from the supply voltages of any digital circuitry.
Long power supply lines on the PCB should be avoided. All device grounds, VDD connections, and VDD
bypass capacitors must be connected as close as possible to the IC. For a PCB with a topside RF ground
plane, the VSS pins should be connected directly to the ground plane. For a PCB with a bottom ground
plane, the best technique is to have via holes as close as possible to the VSS pads. A minimum of one via
hole should be used for each VSS pin.
Full-swing digital data or control signals should not be routed close to the crystal or the power supply lines.
Capacitive loading of full-swing digital output lines should be minimized in order to avoid radio
interference.
Page 77
nRF51422 Product Specification v3.2
11.1.1 PCB layout example
The PCB layout shown in Figure 21 is a reference layout for the QFN package with internal LDO setup. For all
available reference layouts, see the Reference Layout page in our Infocenter.
Figure 21 PCB layout example for QFN48 package with internal LDO setup
Top silk screen
No components
in bottom layer
Top view Bottom view
Page 78
nRF51422 Product Specification v3.2
11.2 Reference design schematics
The following sections include the reference design schematics for all chip variants of the nRF51422. Tab le
83 lists the cross references to the package sections describing each package variant.
Table 83 Cross references to the reference design variants
For package See section:
QFAA Section 11.3 “QFAA QFN48 package” on page 79
QFAB Section 11.4 “QFAB QFN48 package” on page 85
QFAC Section 11.5 “QFAC QFN48 package” on page 91
CDAB Section 11.6 “CDAB WLCSP package” on page 97
CEAA Section 11.7 “CEAA WLCSP package” on page 103
CFAC Section 11.8 “CFAC WLCSP package” on page 109
Page 79
nRF51422 Product Specification v3.2
11.3 QFAA QFN48 package
Documentation for the QFAA QFN48 package reference circuit, including Altium Designer files, PCB layout
files, and PCB production files can be downloaded from the Infocenter.
11.3.1 QFAA QFN48 schematic with internal LDO setup
Figure 22 QFAA QFN48 with internal LDO setup
Note: For PCB reference layouts, see the Reference Layout page in the Infocenter.
C1
12pF
C2
12pF
X1
16MHz
C9
1.0nF
C8
100nF
C10
47nF
C11
100nF
VCC_nRF
VCC_nRF
GND
VCC_nRF
C7
100nF
P0.07
P0.30
P0.08
P0.09
P0.10
P0.11
P0.12
P0.13
P0.14
P0.15
P0.16
P0.17
P0.18
P0.19
P0.20
P0.21
P0.22
P0.23
P0.24
P0.25
P0.28
P0.29
P0.00
P0.01
P0.02
P0.03
P0.04
P0.06
SWCLK
SWDIO
P0.05
C3
2.2nF
C4
1.0pF
C5
2.2pF
C6
1.5pF
VDD
1
VDD
12
VSS
13
VDD_PA 30
ANT1 31
ANT2 32
VSS 33
VSS 34
AVDD 35
AVDD 36
XC1 37
XC2 38
nRF51x22
DCC
2
P0.30
3
P0.00
4
P0.01
5
P0.02
6
P0.03
7
P0.04
8
P0.05
9
P0.06
10
P0.07
11
P0.08
14
P0.09
15
P0.10
16
P0.11
17
DEC1 39
P0.21 40
P0.22 41
P0.23 42
P0.24 43
P0.25 44
P0.27 46
P0.26 45
P0.29 48
P0.28 47
P0.17 25
P0.18 26
P0.19 27
P0.20 28
DEC2 29
P0.12
18
P0.13
19
P0.14
20
P0.15
21
SWDIO/nRESET
23
SWDCLK
24
P0.16
22
U1
nRF51x22-QFAA
C14
12pF
C13
12pF
X2
32.768kHz
XL2
XL1
Optional
L1
4.7nH
L2
10nH
L3
3.3nH
Page 80
nRF51422 Product Specification v3.2
11.3.1.1 Bill of Materials
Table 84 QFAA QFN48 with internal LDO setup
Designator Value Description Footprint
C1, C2, C13, C14 12 pF Capacitor, NP0, ±2% 0402
C3 2.2 nF Capacitor, X7R, ±10% 0402
C4 1.0 pF Capacitor, NP0, ±0.1 pF 0402
C5 2.2 pF Capacitor, NP0, ±0.1 pF 0402
C6 1.5 pF Capacitor, NP0, ±0.1 pF 0402
C7, C8, C11 100 nF Capacitor, X7R, ±10% 0402
C9 1.0 nF Capacitor, X7R, ±10% 0402
C10 47 nF Capacitor, X7R, ±10% 0402
L1 4.7 nH High frequency chip inductor ±5% 0402
L2 10 nH High frequency chip inductor ±5% 0402
L3 3.3 nH High frequency chip inductor ±5% 0402
U1 nRF51422-QFAA RF SoC QFN-48
X1 16 MHz Crystal SMD 2520, 16 MHz, 8 pF, ±40 ppm SMD 2520
X2 32.768 kHz Crystal SMD 3215, 32.768 kHz, 9 pF, ±20 ppm SMD 3215
Page 81
nRF51422 Product Specification v3.2
11.3.2 QFAA QFN48 schematic with low voltage mode setup
Figure 23 QFAA QFN48 with low voltage mode setup
Note: For PCB reference layouts, see the Reference Layout page in the Infocenter.
C1
12pF
C2
12pF
X1
16MHz
C9
1.0nF
C8
100nF
C10
47nF
C11
100nF
VCC_1V8
VCC_1V8
GND
VCC_1V8
C7
100nF
VCC_1V8P0.07
P0.30
P0.08
P0.09
P0.10
P0.11
P0.12
P0.13
P0.14
P0.15
P0.16
P0.17
P0.18
P0.19
P0.20
P0.21
P0.22
P0.23
P0.24
P0.25
P0.28
P0.29
P0.00
P0.01
P0.02
P0.03
P0.04
P0.06
SWCLK
SWDIO
P0.05
C3
2.2nF
C4
1.0pF
C5
2.2pF
C6
1.5pF
C14
12pF
C13
12pF
X2
32.768kHz
XL2
XL1
Optional
VDD
1
VDD
12
VSS
13
VDD_PA 30
ANT1 31
ANT2 32
VSS 33
VSS 34
AVDD 35
AVDD 36
XC1 37
XC2 38
nRF51x22
DCC
2
P0.30
3
P0.00
4
P0.01
5
P0.02
6
P0.03
7
P0.04
8
P0.05
9
P0.06
10
P0.07
11
P0.08
14
P0.09
15
P0.10
16
P0.11
17
DEC1 39
P0.21 40
P0.22 41
P0.23 42
P0.24 43
P0.25 44
P0.27 46
P0.26 45
P0.29 48
P0.28 47
P0.17 25
P0.18 26
P0.19 27
P0.20 28
DEC2 29
P0.12
18
P0.13
19
P0.14
20
P0.15
21
SWDIO/nRESET
23
SWDCLK
24
P0.16
22
U1
nRF51x22-QFAA
L1
4.7nH
L2
10nH
L3
3.3nH
Page 82
nRF51422 Product Specification v3.2
11.3.2.1 Bill of Materials
Table 85 QFAA QFN48 with low voltage mode setup
Designator Value Description Footprint
C1, C2, C13, C14 12 pF Capacitor, NP0, ±2% 0402
C3 2.2 nF Capacitor, X7R, ±10% 0402
C4 1.0 pF Capacitor, NP0, ±0.1 pF 0402
C5 2.2 pF Capacitor, NP0, ±0.1 pF 0402
C6 1.5 pF Capacitor, NP0, ±0.1 pF 0402
C7, C8, C11 100 nF Capacitor, X7R, ±10% 0402
C9 1.0 nF Capacitor, X7R, ±10% 0402
C10 47 nF Capacitor, X7R, ±10% 0402
L1 4.7 nH High frequency chip inductor ±5% 0402
L2 10 nH High frequency chip inductor ±5% 0402
L3 3.3 nH High frequency chip inductor ±5% 0402
U1 nRF51422-QFAA RF SoC QFN-48
X1 16 MHz Crystal SMD 2520, 16 MHz, 8 pF, ±40 ppm SMD 2520
X2 32.768 kHz Crystal SMD 3215, 32.768 kHz, 9 pF, ±20 ppm SMD 3215
Page 83
nRF51422 Product Specification v3.2
11.3.3 QFAA QFN48 schematic with DC/DC converter setup
Figure 24 QFAA QFN48 with DC/DC converter setup
Note: For PCB reference layouts, see the Reference Layout page in the Infocenter.
C1
12pF
C2
12pF
C3
2.2nF
C4
1.0pF
C5
2.2pF
X1
16MHz
C9
1.0nF
C7
4.7μF
C8
100nF
C10
47nF
C11
100nF
AVDD
VCC_nRF
VCC_nRF P0.07
P0.30
P0.08
P0.09
P0.10
P0.11
P0.12
P0.13
P0.14
P0.15
P0.16
P0.17
P0.18
P0.19
P0.20
P0.21
P0.22
P0.23
P0.24
P0.25
P0.28
P0.29
P0.00
P0.01
P0.02
P0.03
P0.04
P0.06
SWCLK
SWDIO
GND
L4
10μH
C12
1.0μF
L5
15nH
AVDD
P0.05
L1
4.7nH
L2
10nH
L3
3.3nH
C6
1.5pF
C14
12pF
C13
12pF
X2
32.768kHz
XL2
XL1
Optional
VDD
1
VDD
12
VSS
13
VDD_PA 30
ANT1 31
ANT2 32
VSS 33
VSS 34
AVDD 35
AVDD 36
XC1 37
XC2 38
nRF51x22
DCC
2
P0.30
3
P0.00
4
P0.01
5
P0.02
6
P0.03
7
P0.04
8
P0.05
9
P0.06
10
P0.07
11
P0.08
14
P0.09
15
P0.10
16
P0.11
17
DEC1 39
P0.21 40
P0.22 41
P0.23 42
P0.24 43
P0.25 44
P0.27 46
P0.26 45
P0.29 48
P0.28 47
P0.17 25
P0.18 26
P0.19 27
P0.20 28
DEC2 29
P0.12
18
P0.13
19
P0.14
20
P0.15
21
SWDIO/nRESET
23
SWDCLK
24
P0.16
22
U1
nRF51x22-QFAA
Page 84
nRF51422 Product Specification v3.2
11.3.3.1 Bill of Materials
Table 86 QFAA QFN48 with DC/DC converter setup
Designator Value Description Footprint
C1, C2, C13, C14 12 pF Capacitor, NP0, ±2% 0402
C3 2.2 nF Capacitor, X7R, ±10% 0402
C4 1.0 pF Capacitor, NP0, ±0.1 pF 0402
C5 2.2 pF Capacitor, NP0, ±0.1 pF 0402
C6 1.5 pF Capacitor, NP0, ±0.1 pF 0402
C7 4.7 µF Capacitor, X5R, ±10% 0603
C8, C11 100 nF Capacitor, X7R, ±10% 0402
C9 1.0 nF Capacitor, X7R, ±10% 0402
C10 47 nF Capacitor, X7R, ±10% 0402
C12 1.0 µF Capacitor, X7R, ±10% 0603
L1 4.7 nH High frequency chip inductor ±5% 0402
L2 10 nH High frequency chip inductor ±5% 0402
L3 3.3 nH High frequency chip inductor ±5% 0402
L4 10 µH Chip inductor, IDC,min = 50 mA, ±20% 0603
L5 15 nH High frequency chip inductor ±10% 0402
U1 nRF51422-QFAA RF SoC QFN-48
X1 16 MHz Crystal SMD 2520, 16 MHz, 8 pF, ±40 ppm SMD 2520
X2 32.768 kHz Crystal SMD 3215, 32.768 kHz, 9 pF, ±20 ppm SMD 3215
Page 85
nRF51422 Product Specification v3.2
11.4 QFAB QFN48 package
Documentation for the QFAB QFN48 package reference circuit, including Altium Designer files, PCB layout
files, and PCB production files can be downloaded from the Infocenter.
11.4.1 QFAB QFN48 schematic with internal LDO setup
Figure 25 QFAB QFN48 with internal LDO setup
Note: For PCB reference layouts, see the Reference Layout page in the Infocenter.
C1
12pF
C2
12pF
X1
16MHz
C9
1.0nF
C8
100nF
C10
47nF
C11
100nF
VCC_nRF
VCC_nRF
GND
VCC_nRF
C7
100nF
P0.07
P0.30
P0.08
P0.09
P0.10
P0.11
P0.12
P0.13
P0.14
P0.15
P0.16
P0.17
P0.18
P0.19
P0.20
P0.21
P0.22
P0.23
P0.24
P0.25
P0.28
P0.29
P0.00
P0.01
P0.02
P0.03
P0.04
P0.06
SWCLK
SWDIO
P0.05
C3
2.2nF
C4
1.0pF
C5
2.2pF
C6
1.5pF
C14
12pF
C13
12pF
X2
32.768kHz
XL2
XL1
Optional
VDD
1
VDD
12
VSS
13
VDD_PA 30
ANT1 31
ANT2 32
VSS 33
VSS 34
AVDD 35
AVDD 36
XC1 37
XC2 38
nRF51x22
DCC
2
P0.30
3
P0.00
4
P0.01
5
P0.02
6
P0.03
7
P0.04
8
P0.05
9
P0.06
10
P0.07
11
P0.08
14
P0.09
15
P0.10
16
P0.11
17
DEC1 39
P0.21 40
P0.22 41
P0.23 42
P0.24 43
P0.25 44
P0.27 46
P0.26 45
P0.29 48
P0.28 47
P0.17 25
P0.18 26
P0.19 27
P0.20 28
DEC2 29
P0.12
18
P0.13
19
P0.14
20
P0.15
21
SWDIO/nRESET
23
SWDCLK
24
P0.16
22
U1
nRF51x22-QFAB
L1
4.7nH
L2
10nH
L3
3.3nH
Page 86
nRF51422 Product Specification v3.2
11.4.1.1 Bill of Materials
Table 87 QFAB QFN48 with internal LDO setup
Designator Value Description Footprint
C1, C2, C13, C14 12 pF Capacitor, NP0, ±2% 0402
C3 2.2 nF Capacitor, X7R, ±10% 0402
C4 1.0 pF Capacitor, NP0, ±0.1 pF 0402
C5 2.2 pF Capacitor, NP0, ±0.1 pF 0402
C6 1.5 pF Capacitor, NP0, ±0.1 pF 0402
C7, C8, C11 100 nF Capacitor, X7R, ±10% 0402
C9 1.0 nF Capacitor, X7R, ±10% 0402
C10 47 nF Capacitor, X7R, ±10% 0402
L1 4.7 nH High frequency chip inductor ±5% 0402
L2 10 nH High frequency chip inductor ±5% 0402
L3 3.3 nH High frequency chip inductor ±5% 0402
U1 nRF51422-QFAB RF SoC QFN-48
X1 16 MHz Crystal SMD 2520, 16 MHz, 8 pF, ±40 ppm SMD 2520
X2 32.768 kHz Crystal SMD 3215, 32.768 kHz, 9 pF, ±20 ppm SMD 3215
Page 87
nRF51422 Product Specification v3.2
11.4.2 QFAB QFN48 schematic with low voltage mode setup
Figure 26 QFAB QFN48 with low voltage mode setup
Note: For PCB reference layouts, see the Reference Layout page in the Infocenter.
C1
12pF
C2
12pF
X1
16MHz
C9
1.0nF
C8
100nF
C10
47nF
C11
100nF
VCC_1V8
VCC_1V8
GND
VCC_1V8
C7
100nF
VCC_1V8P0.07
P0.30
P0.08
P0.09
P0.10
P0.11
P0.12
P0.13
P0.14
P0.15
P0.16
P0.17
P0.18
P0.19
P0.20
P0.21
P0.22
P0.23
P0.24
P0.25
P0.28
P0.29
P0.00
P0.01
P0.02
P0.03
P0.04
P0.06
SWCLK
SWDIO
P0.05
C3
2.2nF
C4
1.0pF
C5
2.2pF
C6
1.5pF
C14
12pF
C13
12pF
X2
32.768kHz
XL2
XL1
Optional
VDD
1
VDD
12
VSS
13
VDD_PA 30
ANT1 31
ANT2 32
VSS 33
VSS 34
AVDD 35
AVDD 36
XC1 37
XC2 38
nRF51x22
DCC
2
P0.30
3
P0.00
4
P0.01
5
P0.02
6
P0.03
7
P0.04
8
P0.05
9
P0.06
10
P0.07
11
P0.08
14
P0.09
15
P0.10
16
P0.11
17
DEC1 39
P0.21 40
P0.22 41
P0.23 42
P0.24 43
P0.25 44
P0.27 46
P0.26 45
P0.29 48
P0.28 47
P0.17 25
P0.18 26
P0.19 27
P0.20 28
DEC2 29
P0.12
18
P0.13
19
P0.14
20
P0.15
21
SWDIO/nRESET
23
SWDCLK
24
P0.16
22
U1
nRF51x22-QFAB
L1
4.7nH
L2
10nH
L3
3.3nH
Page 88
nRF51422 Product Specification v3.2
11.4.2.1 Bill of Materials
Table 88 QFAB QFN48 with low voltage mode setup
Designator Value Description Footprint
C1, C2, C13, C14 12 pF Capacitor, NP0, ±2% 0402
C3 2.2 nF Capacitor, X7R, ±10% 0402
C4 1.0 pF Capacitor, NP0, ±0.1 pF 0402
C5 2.2 pF Capacitor, NP0, ±0.1 pF 0402
C6 1.5 pF Capacitor, NP0, ±0.1 pF 0402
C7, C8, C11 100 nF Capacitor, X7R, ±10% 0402
C9 1.0 nF Capacitor, X7R, ±10% 0402
C10 47 nF Capacitor, X7R, ±10% 0402
L1 4.7 nH High frequency chip inductor ±5% 0402
L2 10 nH High frequency chip inductor ±5% 0402
L3 3.3 nH High frequency chip inductor ±5% 0402
U1 nRF51422-QFAB RF SoC QFN-48
X1 16 MHz Crystal SMD 2520, 16 MHz, 8 pF, ±40 ppm SMD 2520
X2 32.768 kHz Crystal SMD 3215, 32.768 kHz, 9 pF, ±20 ppm SMD 3215
Page 89
nRF51422 Product Specification v3.2
11.4.3 QFAB QFN48 schematic with DC/DC converter setup
Figure 27 QFAB QFN48 with DC/DC converter setup
Note: For PCB reference layouts, see the Reference Layout page in the Infocenter.
C1
12pF
C2
12pF
C3
2.2nF
C4
1.0pF
C5
2.2pF
X1
16MHz
C9
1.0nF
C7
4.7μF
C8
100nF
C10
47nF
C11
100nF
AVDD
VCC_nRF
VCC_nRF P0.07
P0.30
P0.08
P0.09
P0.10
P0.11
P0.12
P0.13
P0.14
P0.15
P0.16
P0.17
P0.18
P0.19
P0.20
P0.21
P0.22
P0.23
P0.24
P0.25
P0.28
P0.29
P0.00
P0.01
P0.02
P0.03
P0.04
P0.06
SWCLK
SWDIO
GND
L4
10μH
C12
1.0μF
L5
15nH
AVDD
P0.05
L1
4.7nH
L2
10nH
L3
3.3nH
C6
1.5pF
C14
12pF
C13
12pF
X2
32.768kHz
XL2
XL1
Optional
VDD
1
VDD
12
VSS
13
VDD_PA 30
ANT1 31
ANT2 32
VSS 33
VSS 34
AVDD 35
AVDD 36
XC1 37
XC2 38
nRF51x22
DCC
2
P0.30
3
P0.00
4
P0.01
5
P0.02
6
P0.03
7
P0.04
8
P0.05
9
P0.06
10
P0.07
11
P0.08
14
P0.09
15
P0.10
16
P0.11
17
DEC1 39
P0.21 40
P0.22 41
P0.23 42
P0.24 43
P0.25 44
P0.27 46
P0.26 45
P0.29 48
P0.28 47
P0.17 25
P0.18 26
P0.19 27
P0.20 28
DEC2 29
P0.12
18
P0.13
19
P0.14
20
P0.15
21
SWDIO/nRESET
23
SWDCLK
24
P0.16
22
U1
nRF51x22-QFAB
Page 90
nRF51422 Product Specification v3.2
11.4.3.1 Bill of Materials
Table 89 QFAB QFN48 with DC/DC converter setup
Designator Value Description Footprint
C1, C2, C13, C14 12 pF Capacitor, NP0, ±2% 0402
C3 2.2 nF Capacitor, X7R, ±10% 0402
C4 1.0 pF Capacitor, NP0, ±0.1 pF 0402
C5 2.2 pF Capacitor, NP0, ±0.1 pF 0402
C6 1.5 pF Capacitor, NP0, ±0.1 pF 0402
C7 4.7 µF Capacitor, X5R, ±10% 0603
C8, C11 100 nF Capacitor, X7R, ±10% 0402
C9 1.0 nF Capacitor, X7R, ±10% 0402
C10 47 nF Capacitor, X7R, ±10% 0402
C12 1.0 µF Capacitor, X7R, ±10% 0603
L1 4.7 nH High frequency chip inductor ±5% 0402
L2 10 nH High frequency chip inductor ±5% 0402
L3 3.3 nH High frequency chip inductor ±5% 0402
L4 10 µH Chip inductor, IDC,min = 50 mA, ±20% 0603
L5 15 nH High frequency chip inductor ±10% 0402
U1 nRF51422-QFAB RF SoC QFN-48
X1 16 MHz Crystal SMD 2520, 16 MHz, 8 pF, ±40 ppm SMD 2520
X2 32.768 kHz Crystal SMD 3215, 32.768 kHz, 9 pF, ±20 ppm SMD 3215
Page 91
nRF51422 Product Specification v3.2
11.5 QFAC QFN48 package
Documentation for the QFAC QFN48 package reference circuit, including Altium Designer files, PCB layout
files, and PCB production files can be downloaded from the Infocenter.
11.5.1 QFAC QFN48 schematic with internal LDO setup
Figure 28 QFAC QFN48 with internal LDO setup
Note: For PCB reference layouts, see the Reference Layout page in the Infocenter.
C1
12pF
C2
12pF
X1
16MHz
C9
1.0nF
C8
100nF
C10
47nF
C11
100nF
VCC_nRF
VCC_nRF
GND
VCC_nRF
C7
100nF
P0.07
P0.30
P0.08
P0.09
P0.10
P0.11
P0.12
P0.13
P0.14
P0.15
P0.16
P0.17
P0.18
P0.19
P0.20
P0.21
P0.22
P0.23
P0.24
P0.25
P0.28
P0.29
P0.00
P0.01
P0.02
P0.03
P0.04
P0.06
SWCLK
SWDIO
P0.05
C3
2.2nF
C4
1.0pF
C5
3.9pF
C6
1.5pF
C14
12pF
C13
12pF
X2
32.768kHz
XL2
XL1
Optional
VDD
1
VDD
12
VSS
13
VDD_PA 30
ANT1 31
ANT2 32
VSS 33
VSS 34
AVDD 35
AVDD 36
XC1 37
XC2 38
nRF51x22
DCC
2
P0.30
3
P0.00
4
P0.01
5
P0.02
6
P0.03
7
P0.04
8
P0.05
9
P0.06
10
P0.07
11
P0.08
14
P0.09
15
P0.10
16
P0.11
17
DEC1 39
P0.21 40
P0.22 41
P0.23 42
P0.24 43
P0.25 44
P0.27 46
P0.26 45
P0.29 48
P0.28 47
P0.17 25
P0.18 26
P0.19 27
P0.20 28
DEC2 29
P0.12
18
P0.13
19
P0.14
20
P0.15
21
SWDIO/nRESET
23
SWDCLK
24
P0.16
22
U1
nRF51x22-QFAC
L1
4.7nH
L3
3.3nH
L2
27nH
Page 92
nRF51422 Product Specification v3.2
11.5.1.1 Bill of Materials
Table 90 QFAC QFN48 with internal LDO setup
Designator Value Description Footprint
C1, C2, C13, C14 12 pF Capacitor, NP0, ±2% 0402
C3 2.2 nF Capacitor, X7R, ±10% 0402
C4 1.0 pF Capacitor, NP0, ±0.1 pF 0402
C5 3.9 pF Capacitor, NP0, ±0.1 pF 0402
C6 1.5 pF Capacitor, NP0, ±0.1 pF 0402
C7, C8, C11 100 nF Capacitor, X7R, ±10% 0402
C9 1.0 nF Capacitor, X7R, ±10% 0402
C10 47 nF Capacitor, X7R, ±10% 0402
L1 4.7 nH High frequency chip inductor ±5% 0402
L2 27 nH High frequency chip inductor ±5% 0402
L3 3.3 nH High frequency chip inductor ±5% 0402
U1 nRF51422-QFAC RF SoC QFN-48
X1 16 MHz Crystal SMD 2520, 16 MHz, 8 pF, ±40 ppm SMD 2520
X2 32.768 kHz Crystal SMD 3215, 32.768 kHz, 9 pF, ±20 ppm SMD 3215
Page 93
nRF51422 Product Specification v3.2
11.5.2 QFAC QFN48 schematic with low voltage mode setup
Figure 29 QFAC QFN48 with low voltage mode setup
Note: For PCB reference layouts, see the Reference Layout page in the Infocenter.
C1
12pF
C2
12pF
X1
16MHz
C9
1.0nF
C8
100nF
C10
47nF
C11
100nF
VCC_1V8
VCC_1V8
GND
VCC_1V8
C7
100nF
VCC_1V8P0.07
P0.30
P0.08
P0.09
P0.10
P0.11
P0.12
P0.13
P0.14
P0.15
P0.16
P0.17
P0.18
P0.19
P0.20
P0.21
P0.22
P0.23
P0.24
P0.25
P0.28
P0.29
P0.00
P0.01
P0.02
P0.03
P0.04
P0.06
SWCLK
SWDIO
P0.05
C3
2.2nF
C4
1.0pF
C5
3.9pF
C6
1.5pF
C14
12pF
C13
12pF
X2
32.768kHz
XL2
XL1
Optional
VDD
1
VDD
12
VSS
13
VDD_PA 30
ANT1 31
ANT2 32
VSS 33
VSS 34
AVDD 35
AVDD 36
XC1 37
XC2 38
nRF51x22
DCC
2
P0.30
3
P0.00
4
P0.01
5
P0.02
6
P0.03
7
P0.04
8
P0.05
9
P0.06
10
P0.07
11
P0.08
14
P0.09
15
P0.10
16
P0.11
17
DEC1 39
P0.21 40
P0.22 41
P0.23 42
P0.24 43
P0.25 44
P0.27 46
P0.26 45
P0.29 48
P0.28 47
P0.17 25
P0.18 26
P0.19 27
P0.20 28
DEC2 29
P0.12
18
P0.13
19
P0.14
20
P0.15
21
SWDIO/nRESET
23
SWDCLK
24
P0.16
22
U1
nRF51x22-QFAC
L1
4.7nH
L3
3.3nH
L2
27nH
Page 94
nRF51422 Product Specification v3.2
11.5.2.1 Bill of Materials
Table 91 QFAC QFN48 with low voltage mode setup
Designator Value Description Footprint
C1, C2, C13, C14 12 pF Capacitor, NP0, ±2% 0402
C3 2.2 nF Capacitor, X7R, ±10% 0402
C4 1.0 pF Capacitor, NP0, ±0.1 pF 0402
C5 3.9 pF Capacitor, NP0, ±0.1 pF 0402
C6 1.5 pF Capacitor, NP0, ±0.1 pF 0402
C7, C8, C11 100 nF Capacitor, X7R, ±10% 0402
C9 1.0 nF Capacitor, X7R, ±10% 0402
C10 47 nF Capacitor, X7R, ±10% 0402
L1 4.7 nH High frequency chip inductor ±5% 0402
L2 27 nH High frequency chip inductor ±5% 0402
L3 3.3 nH High frequency chip inductor ±5% 0402
U1 nRF51422-QFAC RF SoC QFN-48
X1 16 MHz Crystal SMD 2520, 16 MHz, 8 pF, ±40 ppm SMD 2520
X2 32.768 kHz Crystal SMD 3215, 32.768 kHz, 9 pF, ±20 ppm SMD 3215
Page 95
nRF51422 Product Specification v3.2
11.5.3 QFAC QFN48 schematic with DC/DC converter setup
Figure 30 QFAC QFN48 with DC/DC converter setup
Note: For PCB reference layouts, see the Reference Layout page in the Infocenter.
C1
12pF
C2
12pF
C3
2.2nF
C4
1.0pF
C5
3.9pF
X1
16MHz
C9
1.0nF
C7
4.7μF
C8
100nF
C10
47nF
C11
100nF
AVDD
VCC_nRF
VCC_nRF P0.07
P0.30
P0.08
P0.09
P0.10
P0.11
P0.12
P0.13
P0.14
P0.15
P0.16
P0.17
P0.18
P0.19
P0.20
P0.21
P0.22
P0.23
P0.24
P0.25
P0.28
P0.29
P0.00
P0.01
P0.02
P0.03
P0.04
P0.06
SWCLK
SWDIO
GND
L4
10μH
C12
1.0μF
L5
15nH
AVDD
P0.05
L1
4.7nH
L2
27nH
L3
3.3nH
C6
1.5pF
VDD
1
VDD
12
VSS
13
VDD_PA 30
ANT1 31
ANT2 32
VSS 33
VSS 34
AVDD 35
AVDD 36
XC1 37
XC2 38
nRF51x22
DCC
2
P0.30
3
P0.00
4
P0.01
5
P0.02
6
P0.03
7
P0.04
8
P0.05
9
P0.06
10
P0.07
11
P0.08
14
P0.09
15
P0.10
16
P0.11
17
DEC1 39
P0.21 40
P0.22 41
P0.23 42
P0.24 43
P0.25 44
P0.27 46
P0.26 45
P0.29 48
P0.28 47
P0.17 25
P0.18 26
P0.19 27
P0.20 28
DEC2 29
P0.12
18
P0.13
19
P0.14
20
P0.15
21
SWDIO/nRESET
23
SWDCLK
24
P0.16
22
U1
nRF51x22-QFAC
C14
12pF
C13
12pF
X2
32.768kHz
XL2
XL1
Optional
Page 96
nRF51422 Product Specification v3.2
11.5.3.1 Bill of Materials
Table 92 QFAC QFN48 with DC/DC converter setup
Designator Value Description Footprint
C1, C2, C13, C14 12 pF Capacitor, NP0, ±2% 0402
C3 2.2 nF Capacitor, X7R, ±10% 0402
C4 1.0 pF Capacitor, NP0, ±0.1 pF 0402
C5 3.9 pF Capacitor, NP0, ±0.1 pF 0402
C6 1.5 pF Capacitor, NP0, ±0.1 pF 0402
C7 4.7 µF Capacitor, X5R, ±10% 0603
C8, C11 100 nF Capacitor, X7R, ±10% 0402
C9 1.0 nF Capacitor, X7R, ±10% 0402
C10 47 nF Capacitor, X7R, ±10% 0402
C12 1.0 µF Capacitor, X7R, ±10% 0603
L1 4.7 nH High frequency chip inductor ±5% 0402
L2 27 nH High frequency chip inductor ±5% 0402
L3 3.3 nH High frequency chip inductor ±5% 0402
L4 10 µH Chip inductor, IDC,min = 50 mA, ±20% 0603
L5 15 nH High frequency chip inductor ±10% 0402
U1 nRF51422-QFAC RF SoC QFN-48
X1 16 MHz Crystal SMD 2520, 16 MHz, 8 pF, ±40 ppm SMD 2520
X2 32.768 kHz Crystal SMD 3215, 32.768 kHz, 9 pF, ±20 ppm SMD 3215
Page 97
nRF51422 Product Specification v3.2
11.6 CDAB WLCSP package
Documentation for the CDAB WLCSP package reference circuit, including Altium Designer files, PCB layout
files, and PCB production files, can be downloaded from the Infocenter.
11.6.1 CDAB WLCSP schematic with internal LDO setup
Figure 31 CDAB WLCSP with internal LDO setup
Note: For PCB reference layouts, see the Reference Layout page in the Infocenter.
RF
VCC_nRF
P0.14
P0.13
P0.12
P0.08
P0.09
P0.10
P0.11
VCC_nRF
C8
100nF
C9
1.0nF
P0.17
P0.18
P0.19
P0.15
P0.16
SWDCLK
SWDIO
P0.04
P0.03
P0.02
P0.30
P0.00
P0.01
P0.05
P0.06
P0.07
P0.20
C10
47nF
P0.31
C1
12pF
C2
12pF
X1
16MHz
C11
100nF
VCC_nRF
C7
100nF
C3
2.2nF
P0.24
P0.25
P0.21
P0.23
P0.22
P0.28
P0.29
C14
12pF
C13
12pF
X2
32.768kHz
XL2
XL1
Optional
ANT1
A3 ANT2
B3
VDD_PA
A2 GND B1
SE A1
B1
BAL-NRF02D3
VDD
B8
VDD
G8
VSS
B1
VDD_PA E1
ANT1 D1
ANT2 C1
VSS
B4
VSS
F4
AVDD A1
XC1 A2
XC2 A3
nRF51x22
DCC
B9
P0.30
C8
P0.00
C9
P0.01
E7
P0.02
D9
P0.03
E9
P0.04
E8
P0.05
G9
P0.06
F8
P0.07
G7
P0.08
H8
P0.09
H7
P0.10
G6
P0.11
H6
DEC1 A4
P0.21 A5
P0.22 B5
P0.23 B6
P0.24 A6
P0.25 C5
P0.27 A8
P0.26 A7
P0.29 C7
P0.28 B7
P0.17 G3
P0.18 F3
P0.19 F2
P0.20 G1
DEC2 F1
P0.12
H5
P0.13
G5
P0.14
G4
P0.15
H4
SWDIO/nRESET
H2
SWDCLK
G2
P0.16
H3
P0.31
D8
VSS D7
VSS F6
VSS F9
U1
nRF51x22-CDAB
Page 98
nRF51422 Product Specification v3.2
11.6.1.1 Bill of Materials
Table 93 CDAB WLCSP with internal LDO setup
Designator Value Description Footprint
B1 BAL-NRF02D3 ST Microelecronics, 50 balun transformer for
2.45 GHz ISM BAL-ST-WLCSP
C1, C2, C13, C14 12 pF Capacitor, NP0, ±2% 0402
C3 2.2 nF Capacitor, X7R, ±10% 0402
C7, C8, C11 100 nF Capacitor, X7R, ±10% 0402
C9 1.0 nF Capacitor, X7R, ±10% 0402
C10 47 nF Capacitor, X7R, ±10% 0402
U1 nRF51422-CDAB RF SoC WLCSP-56
X1 16 MHz Crystal SMD 2520, 16 MHz, 8 pF, ±40 ppm SMD 2520
X2 32.768 kHz Crystal SMD 3215, 32.768 kHz, 9 pF, ±20 ppm SMD 3215
Page 99
nRF51422 Product Specification v3.2
11.6.2 CDAB WLCSP schematic with low voltage mode setup
Figure 32 CDAB WLCSP with low voltage mode setup
Note: For PCB reference layouts, see the Reference Layout page in the Infocenter.
RF
VCC_1V8
P0.14
P0.13
P0.12
P0.08
P0.09
P0.10
P0.11
VCC_1V8
C8
100nF
C9
1.0nF
P0.17
P0.18
P0.19
P0.15
P0.16
SWDCLK
SWDIO
P0.04
P0.03
P0.02
P0.30
P0.00
P0.01
P0.05
P0.06
P0.07
P0.20
C10
47nF
VCC_1V8
P0.31
C1
12pF
C2
12pF
X1
16MHz
C11
100nF
VCC_1V8
C7
100nF
C3
2.2nF
P0.24
P0.25
P0.21
P0.23
P0.22
P0.28
P0.29
C14
12pF
C13
12pF
X2
32.768kHz
XL2
XL1
Optional
ANT1
A3 ANT2
B3
VDD_PA
A2 GND B1
SE A1
B1
BAL-NRF02D3
VDD
B8
VDD
G8
VSS
B1
VDD_PA E1
ANT1 D1
ANT2 C1
VSS
B4
VSS
F4
AVDD A1
XC1 A2
XC2 A3
nRF51x22
DCC
B9
P0.30
C8
P0.00
C9
P0.01
E7
P0.02
D9
P0.03
E9
P0.04
E8
P0.05
G9
P0.06
F8
P0.07
G7
P0.08
H8
P0.09
H7
P0.10
G6
P0.11
H6
DEC1 A4
P0.21 A5
P0.22 B5
P0.23 B6
P0.24 A6
P0.25 C5
P0.27 A8
P0.26 A7
P0.29 C7
P0.28 B7
P0.17 G3
P0.18 F3
P0.19 F2
P0.20 G1
DEC2 F1
P0.12
H5
P0.13
G5
P0.14
G4
P0.15
H4
SWDIO/nRESET
H2
SWDCLK
G2
P0.16
H3
P0.31
D8
VSS D7
VSS F6
VSS F9
U1
nRF51x22-CDAB
Page 100
nRF51422 Product Specification v3.2
11.6.2.1 Bill of Materials
Table 94 CDAB WLCSP with low voltage mode setup
Designator Value Description Footprint
B1 BAL-NRF02D3 ST Microelectronics, 50 balun transformer for
2.45 GHz ISM BAL-ST-WLCSP
C1, C2, C13, C14 12 pF Capacitor, NP0, ±2% 0402
C3 2.2 nF Capacitor, X7R, ±10% 0402
C7, C8, C11 100 nF Capacitor, X7R, ±10% 0402
C9 1.0 nF Capacitor, X7R, ±10% 0402
C10 47 nF Capacitor, X7R, ±10% 0402
U1 nRF51422-CDAB RF SoC WLCSP-56
X1 16 MHz Crystal SMD 2520, 16 MHz, 8 pF, ±40 ppm SMD 2520
X2 32.768 kHz Crystal SMD 3215, 32.768 kHz, 9 pF, ±20 ppm SMD 3215
Page 101
nRF51422 Product Specification v3.2
11.6.3 CDAB WLCSP schematic with DC/DC converter setup
Figure 33 CDAB WLCSP with DC/DC converter setup
Note: For PCB reference layouts, see the Reference Layout page in the Infocenter.
RF
VCC_nRF
P0.14
P0.13
P0.12
P0.08
P0.09
P0.10
P0.11
VCC_nRF
C8
100nF
C3
2.2nF
C9
1.0nF
P0.17
P0.18
P0.19
P0.15
P0.16
SWDCLK
SWDIO
P0.04
P0.03
P0.02
P0.30
P0.00
P0.01
P0.05
P0.06
P0.07
P0.20
P0.24
P0.25
P0.21
C10
47nF
AVDD
C12
1.0μF
L5
15nH
P0.23
P0.22
P0.31
AVDD
C1
12pF
C2
12pF
X1
16MHz
C11
100nF
C7
4.7μF
L4
10μH
P0.28
P0.29
C14
12pF
C13
12pF
X2
32.768kHz
XL2
XL1
Optional
ANT1
A3 ANT2
B3
VDD_PA
A2 GND B1
SE A1
B1
BAL-NRF02D3
VDD
B8
VDD
G8
VSS
B1
VDD_PA E1
ANT1 D1
ANT2 C1
VSS
B4
VSS
F4
AVDD A1
XC1 A2
XC2 A3
nRF51x22
DCC
B9
P0.30
C8
P0.00
C9
P0.01
E7
P0.02
D9
P0.03
E9
P0.04
E8
P0.05
G9
P0.06
F8
P0.07
G7
P0.08
H8
P0.09
H7
P0.10
G6
P0.11
H6
DEC1 A4
P0.21 A5
P0.22 B5
P0.23 B6
P0.24 A6
P0.25 C5
P0.27 A8
P0.26 A7
P0.29 C7
P0.28 B7
P0.17 G3
P0.18 F3
P0.19 F2
P0.20 G1
DEC2 F1
P0.12
H5
P0.13
G5
P0.14
G4
P0.15
H4
SWDIO/nRESET
H2
SWDCLK
G2
P0.16
H3
P0.31
D8
VSS D7
VSS F6
VSS F9
U1
nRF51x22-CDAB
Page 102
nRF51422 Product Specification v3.2
11.6.3.1 Bill of Materials
Table 95 CDAB WLCSP with DC/DC converter setup
Designator Value Description Footprint
B1 BAL-NRF02D3 ST Microelectronics, 50 balun transformer for
2.45 GHz ISM BAL-ST-WLCSP
C1, C2, C13, C14 12 pF Capacitor, NP0, ±2% 0402
C3 2.2 nF Capacitor, X7R, ±10% 0402
C7 4.7 F Capacitor, X5R, ±10% 0603
C8, C11 100 nF Capacitor, X7R, ±10% 0402
C9 1.0 nF Capacitor, X7R, ±10% 0402
C10 47 nF Capacitor, X7R, ±10% 0402
C12 1.0 F Capacitor, X7R, ±10% 0603
L4 10 H Chip inductor, IDC,min = 50 mA, ±20% 0603
L5 15 nH High frequency chip inductor ±10% 0402
U1 nRF51422-CDAB RF SoC WLCSP-56
X1 16 MHz Crystal SMD 2520, 16 MHz, 8 pF, ±40 ppm SMD 2520
X2 32.768 kHz Crystal SMD 3215, 32.768 kHz, 9 pF, ±20 ppm SMD 3215
Page 103
nRF51422 Product Specification v3.2
11.7 CEAA WLCSP package
Documentation for the CEAA WLCSP package reference circuit, including Altium Designer files, PCB layout
files, and PCB production files, can be downloaded from the Infocenter.
11.7.1 CEAA WLCSP schematic with internal LDO setup
Figure 34 CEAA WLCSP with internal LDO setup
Note: For PCB reference layouts, see the Reference Layout page in the Infocenter.
VCC_nRF
P0.14
P0.13
P0.12
P0.08
P0.09
P0.10
P0.11
VCC_nRF
C8
100nF
C9
1.0nF
P0.17
P0.18
P0.19
P0.15
P0.16
SWDCLK
SWDIO
P0.04
P0.03
P0.02
P0.30
P0.00
P0.01
P0.05
P0.06
P0.07
P0.20
C10
47nF
P0.31
C1
12pF
C2
12pF
X1
16MHz
C11
100nF
VCC_nRF
C7
100nF
C3
2.2nF
P0.24
P0.25
P0.21
P0.23
P0.22
P0.28
P0.29
C14
12pF
C13
12pF
X2
32.768kHz
XL2
XL1
Optional
ANT1
A3 ANT2
B3
VDD_PA
A2 GND B1
SE A1
B1
BAL-NRF02D3
RF
VDD
B8
VDD
H8
VSS
B1
VDD_PA E1
ANT1 D1
ANT2 C1
VSS
B4
VSS
C8
AVDD A1
XC1 A2
XC2 A3
nRF51x22
DCC
B9
P0.30
D8
P0.00
C9
P0.01
E9
P0.02
D9
P0.03
F9
P0.04
F8
P0.05
H9
P0.06
G8
P0.07
H7
P0.08
J8
P0.09
J7
P0.10
H6
P0.11
J6
DEC1 A4
P0.21 A5
P0.22 B5
P0.23 B6
P0.24 A6
P0.25 C5
P0.27 A8
P0.26 A7
P0.29 C7
P0.28 B7
P0.17 G2
P0.18 H1
P0.19 F2
P0.20 G1
DEC2 F1
P0.12
J5
P0.13
H5
P0.14
H4
P0.15
J4
SWDIO/nRESET
J2
SWDCLK
H2
P0.16
J3
P0.31
E8
VSS D7
VSS G6
VSS G9
VSS
H3
U1
nRF51x22-CEAA
Page 104
nRF51422 Product Specification v3.2
11.7.1.1 Bill of Materials
Table 96 CEAA WLCSP with internal LDO setup
Designator Value Description Footprint
B1 BAL-NRF02D3 ST Microelecronics, 50 balun transformer for
2.45 GHz ISM BAL-ST-WLCSP
C1, C2, C13, C14 12 pF Capacitor, NP0, ±2% 0402
C3 2.2 nF Capacitor, X7R, ±10% 0402
C7, C8, C11 100 nF Capacitor, X7R, ±10% 0402
C9 1.0 nF Capacitor, X7R, ±10% 0402
C10 47 nF Capacitor, X7R, ±10% 0402
U1 nRF51422-CEAA RF SoC WLCSP-62
X1 16 MHz Crystal SMD 2520, 16 MHz, 8 pF, ±40 ppm SMD 2520
X2 32.768 kHz Crystal SMD 3215, 32.768 kHz, 9 pF, ±20 ppm SMD 3215
Page 105
nRF51422 Product Specification v3.2
11.7.2 CEAA WLCSP schematic with low voltage mode setup
Figure 35 CEAA WLCSP with low voltage mode setup
Note: For PCB reference layouts, see the Reference Layout page in the Infocenter.
VCC_1V8
P0.14
P0.13
P0.12
P0.08
P0.09
P0.10
P0.11
VCC_1V8
C8
100nF
C9
1.0nF
P0.17
P0.18
P0.19
P0.15
P0.16
SWDCLK
SWDIO
P0.04
P0.03
P0.02
P0.30
P0.00
P0.01
P0.05
P0.06
P0.07
P0.20
C10
47nF
VCC_1V8
P0.31
C1
12pF
C2
12pF
X1
16MHz
C11
100nF
VCC_1V8
C7
100nF
C3
2.2nF
P0.24
P0.25
P0.21
P0.23
P0.22
P0.28
P0.29
C14
12pF
C13
12pF
X2
32.768kHz
XL2
XL1
Optional
ANT1
A3 ANT2
B3
VDD_PA
A2 GND B1
SE A1
B1
BAL-NRF02D3
RF
VDD
B8
VDD
H8
VSS
B1
VDD_PA E1
ANT1 D1
ANT2 C1
VSS
B4
VSS
C8
AVDD A1
XC1 A2
XC2 A3
nRF51x22
DCC
B9
P0.30
D8
P0.00
C9
P0.01
E9
P0.02
D9
P0.03
F9
P0.04
F8
P0.05
H9
P0.06
G8
P0.07
H7
P0.08
J8
P0.09
J7
P0.10
H6
P0.11
J6
DEC1 A4
P0.21 A5
P0.22 B5
P0.23 B6
P0.24 A6
P0.25 C5
P0.27 A8
P0.26 A7
P0.29 C7
P0.28 B7
P0.17 G2
P0.18 H1
P0.19 F2
P0.20 G1
DEC2 F1
P0.12
J5
P0.13
H5
P0.14
H4
P0.15
J4
SWDIO/nRESET
J2
SWDCLK
H2
P0.16
J3
P0.31
E8
VSS D7
VSS G6
VSS G9
VSS
H3
U1
nRF51x22-CEAA
Page 106
nRF51422 Product Specification v3.2
11.7.2.1 Bill of Materials
Table 97 CEAA WLCSP with low voltage mode setup
Designator Value Description Footprint
B1 BAL-NRF02D3 ST Microelectronics, 50 balun transformer for
2.45 GHz ISM BAL-ST-WLCSP
C1, C2, C13, C14 12 pF Capacitor, NP0, ±2% 0402
C3 2.2 nF Capacitor, X7R, ±10% 0402
C7, C8, C11 100 nF Capacitor, X7R, ±10% 0402
C9 1.0 nF Capacitor, X7R, ±10% 0402
C10 47 nF Capacitor, X7R, ±10% 0402
U1 nRF51422-CEAA RF SoC WLCSP-62
X1 16 MHz Crystal SMD 2520, 16 MHz, 8 pF, ±40 ppm SMD 2520
X2 32.768 kHz Crystal SMD 3215, 32.768 kHz, 9 pF, ±20 ppm SMD 3215
Page 107
nRF51422 Product Specification v3.2
11.7.3 CEAA WLCSP schematic with DC/DC converter setup
Figure 36 CEAA WLCSP with DC/DC converter setup
Note: For PCB reference layouts, see the Reference Layout page in the Infocenter.
VCC_nRF
P0.14
P0.13
P0.12
P0.08
P0.09
P0.10
P0.11
VCC_nRF
C8
100nF
C3
2.2nF
C9
1.0nF
P0.17
P0.18
P0.19
P0.15
P0.16
SWDCLK
SWDIO
P0.04
P0.03
P0.02
P0.30
P0.00
P0.01
P0.05
P0.06
P0.07
P0.20
P0.24
P0.25
P0.21
C10
47nF
AVDD
C12
1.0μF
P0.23
P0.22
P0.31
AVDD
C1
12pF
C2
12pF
X1
16MHz
C11
100nF
C7
4.7μF
P0.28
P0.29
C14
12pF
C13
12pF
X2
32.768kHz
XL2
XL1
Optional
ANT1
A3 ANT2
B3
VDD_PA
A2 GND B1
SE A1
B1
BAL-NRF02D3
RF
VDD
B8
VDD
H8
VSS
B1
VDD_PA E1
ANT1 D1
ANT2 C1
VSS
B4
VSS
C8
AVDD A1
XC1 A2
XC2 A3
nRF51x22
DCC
B9
P0.30
D8
P0.00
C9
P0.01
E9
P0.02
D9
P0.03
F9
P0.04
F8
P0.05
H9
P0.06
G8
P0.07
H7
P0.08
J8
P0.09
J7
P0.10
H6
P0.11
J6
DEC1 A4
P0.21 A5
P0.22 B5
P0.23 B6
P0.24 A6
P0.25 C5
P0.27 A8
P0.26 A7
P0.29 C7
P0.28 B7
P0.17 G2
P0.18 H1
P0.19 F2
P0.20 G1
DEC2 F1
P0.12
J5
P0.13
H5
P0.14
H4
P0.15
J4
SWDIO/nRESET
J2
SWDCLK
H2
P0.16
J3
P0.31
E8
VSS D7
VSS G6
VSS G9
VSS
H3
U1
nRF51x22-CEAA
L5
15nH
L4
10μH
Page 108
nRF51422 Product Specification v3.2
11.7.3.1 Bill of Materials
Table 98 CEAA WLCSP with DC/DC converter setup
Designator Value Description Footprint
B1 BAL-NRF02D3 ST Microelectronics, 50 balun transformer for
2.45 GHz ISM BAL-ST-WLCSP
C1, C2, C13, C14 12 pF Capacitor, NP0, ±2% 0402
C3 2.2 nF Capacitor, X7R, ±10% 0402
C7 4.7 F Capacitor, X5R, ±10% 0603
C8, C11 100 nF Capacitor, X7R, ±10% 0402
C9 1.0 nF Capacitor, X7R, ±10% 0402
C10 47 nF Capacitor, X7R, ±10% 0402
C12 1.0 F Capacitor, X7R, ±10% 0603
L4 10 H Chip inductor, IDC,min = 50 mA, ±20% 0603
L5 15 nH High frequency chip inductor ±10% 0402
U1 nRF51422-CEAA RF SoC WLCSP-62
X1 16 MHz Crystal SMD 2520, 16 MHz, 8 pF, ±40 ppm SMD 2520
X2 32.768 kHz Crystal SMD 3215, 32.768 kHz, 9 pF, ±20 ppm SMD 3215
Page 109
nRF51422 Product Specification v3.2
11.8 CFAC WLCSP package
Documentation for the CFAC WLCSP package reference circuit, including Altium Designer files, PCB layout
files, and PCB production files, can be downloaded from the Infocenter.
11.8.1 CFAC WLCSP schematic with internal LDO setup
Figure 37 CFAC WLCSP with internal LDO setup
Note: For PCB reference layouts, see the Reference Layout page in the Infocenter.
RF
VCC_nRF
P0.14
P0.13
P0.12
P0.08
P0.09
P0.10
P0.11
VCC_nRF
C8
100nF
C9
1.0nF
P0.17
P0.18
P0.19
P0.15
P0.16
SWDCLK
SWDIO
P0.04
P0.03
P0.02
P0.30
P0.00
P0.01
P0.05
P0.06
P0.07
P0.20
C10
47nF
P0.31
C1
12pF
C2
12pF
X1
16MHz
C11
100nF
VCC_nRF
C7
100nF
C3
2.2nF
P0.24
P0.25
P0.21
P0.23
P0.22
P0.28
P0.29
C14
12pF
C13
12pF
X2
32.768kHz
XL2
XL1
Optional
ANT1
A3 ANT2
B3
VDD_PA
A2 GND B1
SE A1
B1
BAL-NRF02D3
VDD
B8
VDD
H8
VSS
B1
VDD_PA E1
ANT1 D1
ANT2 C1
VSS
B4
VSS
C8
AVDD A1
XC1 A2
XC2 A3
nRF51x22
DCC
B9
P0.30
D8
P0.00
C9
P0.01
E9
P0.02
D9
P0.03
F9
P0.04
F8
P0.05
H9
P0.06
G8
P0.07
H7
P0.08
J8
P0.09
J7
P0.10
H6
P0.11
J6
DEC1 A4
P0.21 A5
P0.22 B5
P0.23 B6
P0.24 A6
P0.25 C5
P0.27 A8
P0.26 A7
P0.29 C7
P0.28 B7
P0.17 G2
P0.18 H1
P0.19 F2
P0.20 G1
DEC2 F1
P0.12
J5
P0.13
H5
P0.14
H4
P0.15
J4
SWDIO/nRESET
J2
SWDCLK
H2
P0.16
J3
P0.31
E8
VSS D7
VSS G6
VSS G9
VSS
H3
U1
nRF51x22-CFAC
Page 110
nRF51422 Product Specification v3.2
11.8.1.1 Bill of Materials
Table 99 CFAC WLCSP with internal LDO setup
Designator Value Description Footprint
B1 BAL-NRF02D3 ST Microelecronics, 50 balun transformer for
2.45 GHz ISM BAL-ST-WLCSP
C1, C2, C13, C14 12 pF Capacitor, NP0, ±2% 0402
C3 2.2 nF Capacitor, X7R, ±10% 0402
C7, C8, C11 100 nF Capacitor, X7R, ±10% 0402
C9 1.0 nF Capacitor, X7R, ±10% 0402
C10 47 nF Capacitor, X7R, ±10% 0402
U1 nRF51422-CFAC RF SoC WLCSP-62
X1 16 MHz Crystal SMD 2520, 16 MHz, 8 pF, ±40 ppm SMD 2520
X2 32.768 kHz Crystal SMD 3215, 32.768 kHz, 9 pF, ±20 ppm SMD 3215
Page 111
nRF51422 Product Specification v3.2
11.8.2 CFAC WLCSP schematic with low voltage mode setup
Figure 38 CFAC WLCSP with low voltage mode setup
Note: For PCB reference layouts, see the Reference Layout page in the Infocenter.
RF
VCC_1V8
P0.14
P0.13
P0.12
P0.08
P0.09
P0.10
P0.11
VCC_1V8
C8
100nF
C9
1.0nF
P0.17
P0.18
P0.19
P0.15
P0.16
SWDCLK
SWDIO
P0.04
P0.03
P0.02
P0.30
P0.00
P0.01
P0.05
P0.06
P0.07
P0.20
C10
47nF
VCC_1V8
P0.31
C1
12pF
C2
12pF
X1
16MHz
C11
100nF
VCC_1V8
C7
100nF
C3
2.2nF
P0.24
P0.25
P0.21
P0.23
P0.22
P0.28
P0.29
C14
12pF
C13
12pF
X2
32.768kHz
XL2
XL1
Optional
ANT1
A3 ANT2
B3
VDD_PA
A2 GND B1
SE A1
B1
BAL-NRF02D3
VDD
B8
VDD
H8
VSS
B1
VDD_PA E1
ANT1 D1
ANT2 C1
VSS
B4
VSS
C8
AVDD A1
XC1 A2
XC2 A3
nRF51x22
DCC
B9
P0.30
D8
P0.00
C9
P0.01
E9
P0.02
D9
P0.03
F9
P0.04
F8
P0.05
H9
P0.06
G8
P0.07
H7
P0.08
J8
P0.09
J7
P0.10
H6
P0.11
J6
DEC1 A4
P0.21 A5
P0.22 B5
P0.23 B6
P0.24 A6
P0.25 C5
P0.27 A8
P0.26 A7
P0.29 C7
P0.28 B7
P0.17 G2
P0.18 H1
P0.19 F2
P0.20 G1
DEC2 F1
P0.12
J5
P0.13
H5
P0.14
H4
P0.15
J4
SWDIO/nRESET
J2
SWDCLK
H2
P0.16
J3
P0.31
E8
VSS D7
VSS G6
VSS G9
VSS
H3
U1
nRF51x22-CFAC
Page 112
nRF51422 Product Specification v3.2
11.8.2.1 Bill of Materials
Table 100 CFAC WLCSP with low voltage mode setup
Designator Value Description Footprint
B1 BAL-NRF02D3 ST Microelectronics, 50 balun transformer for
2.45 GHz ISM BAL-ST-WLCSP
C1, C2, C13, C14 12 pF Capacitor, NP0, ±2% 0402
C3 2.2 nF Capacitor, X7R, ±10% 0402
C7, C8, C11 100 nF Capacitor, X7R, ±10% 0402
C9 1.0 nF Capacitor, X7R, ±10% 0402
C10 47 nF Capacitor, X7R, ±10% 0402
U1 nRF51422-CFAC RF SoC WLCSP-62
X1 16 MHz Crystal SMD 2520, 16 MHz, 8 pF, ±40 ppm SMD 2520
X2 32.768 kHz Crystal SMD 3215, 32.768 kHz, 9 pF, ±20 ppm SMD 3215
Page 113
nRF51422 Product Specification v3.2
11.8.3 CFAC WLCSP schematic with DC/DC converter setup
Figure 39 CFAC WLCSP with DC/DC converter setup
Note: For PCB reference layouts, see the Reference Layout page in the Infocenter.
RF
VCC_nRF
P0.14
P0.13
P0.12
P0.08
P0.09
P0.10
P0.11
VCC_nRF
C8
100nF
C3
2.2nF
C9
1.0nF
P0.17
P0.18
P0.19
P0.15
P0.16
SWDCLK
SWDIO
P0.04
P0.03
P0.02
P0.30
P0.00
P0.01
P0.05
P0.06
P0.07
P0.20
P0.24
P0.25
P0.21
C10
47nF
AVDD
C12
1.0μF
P0.23
P0.22
P0.31
AVDD
C1
12pF
C2
12pF
X1
16MHz
C11
100nF
C7
4.7μF
P0.28
P0.29
C14
12pF
C13
12pF
X2
32.768kHz
XL2
XL1
Optional
ANT1
A3 ANT2
B3
VDD_PA
A2 GND B1
SE A1
B1
BAL-NRF02D3
VDD
B8
VDD
H8
VSS
B1
VDD_PA E1
ANT1 D1
ANT2 C1
VSS
B4
VSS
C8
AVDD A1
XC1 A2
XC2 A3
nRF51x22
DCC
B9
P0.30
D8
P0.00
C9
P0.01
E9
P0.02
D9
P0.03
F9
P0.04
F8
P0.05
H9
P0.06
G8
P0.07
H7
P0.08
J8
P0.09
J7
P0.10
H6
P0.11
J6
DEC1 A4
P0.21 A5
P0.22 B5
P0.23 B6
P0.24 A6
P0.25 C5
P0.27 A8
P0.26 A7
P0.29 C7
P0.28 B7
P0.17 G2
P0.18 H1
P0.19 F2
P0.20 G1
DEC2 F1
P0.12
J5
P0.13
H5
P0.14
H4
P0.15
J4
SWDIO/nRESET
J2
SWDCLK
H2
P0.16
J3
P0.31
E8
VSS D7
VSS G6
VSS G9
VSS
H3
U1
nRF51x22-CFAC
L5
15nH
L4
10μH
Page 114
nRF51422 Product Specification v3.2
11.8.3.1 Bill of Materials
Table 101 CFAC WLCSP with DC/DC converter setup
Designator Value Description Footprint
B1 BAL-NRF02D3 ST Microelectronics, 50 balun transformer for
2.45 GHz ISM BAL-ST-WLCSP
C1, C2, C13, C14 12 pF Capacitor, NP0, ±2% 0402
C3 2.2 nF Capacitor, X7R, ±10% 0402
C7 4.7 F Capacitor, X5R, ±10% 0603
C8, C11 100 nF Capacitor, X7R, ±10% 0402
C9 1.0 nF Capacitor, X7R, ±10% 0402
C10 47 nF Capacitor, X7R, ±10% 0402
C12 1.0 F Capacitor, X7R, ±10% 0603
L4 10 H Chip inductor, IDC,min = 50 mA, ±20% 0603
L5 15 nH High frequency chip inductor ±10% 0402
U1 nRF51422-CFAC RF SoC WLCSP-62
X1 16 MHz Crystal SMD 2520, 16 MHz, 8 pF, ±40 ppm SMD 2520
X2 32.768 kHz Crystal SMD 3215, 32.768 kHz, 9 pF, ±20 ppm SMD 3215
Page 115
nRF51422 Product Specification v3.2
12 Glossary
Table 102 Glossary
Term Description
EOC Extreme Operating Conditions
GFSK Gaussian Frequency-Shift Keying
GPIO General Purpose Input Output
ISM Industrial Scientific Medical
MOQ Minimum Order Quantity
NOC Nominal Operating Conditions
NVMC Non-Volatile Memory Controller
QDEC Quadrature Decoder
RF Radio Frequency
RoHS Restriction of Hazardous Substances
RSSI Radio Signal Strength Indicator
SPI Serial Peripheral Interface
TWI Two-Wire Interface
UART Universal Asynchronous Receiver Transmitter
WLCSP Wafer Level Chip Scale Packet
