REFERENCE BOARD MANUAL
P9038-R-EVK 09/23/15 1 ©2015 Integrated Device Technology, Inc.
5W Qi Wireless Power Transmitter
Reference Board P9038-R-EVK
Features & Benefits
•WPC 1.1.2 (Qi) compliant for interoperability Compact form
factor for fast prototyping
•Layout module provided for direct copy to system board
•2-layer PCB reference layout and fully-tested BOM
•4.5 to 6.9 V input, designed for 5 W output on the receiver
•Integrated power stage for low BOM cost, low
manufacturing cost, and small PCB area
•Input in-rush control prevents surges with inexpensive
power adapters
Evaluation Kit Contents
•One fully-assembled P9038-R-EVK reference board
•USB to Micro USB cable
•Application notes, datasheets, manuals, guides, videos,
layout files, and other digital resources can be found at:
idt.com/P9038-R-EVK
Description
The P9038-R-EVK is a turnkey 5 Watt, Qi-compliant wireless
power transmitter reference kit for fast prototyping and design
integration. The kit consists of an easy-to-use reference board
and comprehensive support collateral that significantly eases
design-in effort and minimizes time-to-market.
An associated layout module enables direct instantiation on to
a system board, while an optimized and fully-tested
Bill-of-Materials (BOM) takes the guess-work out of
component selection. The P9038-based solution is well-suited
for a wide range of applications, including PC peripherals,
furniture, medical devices, and other portable devices still
hindered by traditional contact-based charging bases or
cables.
The board features a ubiquitous micro-USB connector to
supply 5 V power to the input. Alternatively, VIN and GND test
points can be connected to a different power source or wired
directly into a prototype system.
IDT's wireless power transmitter solution is complemented by
the P9025AC-R-EVK Qi-compliant 5 Watt wireless power
receiver reference kit. Visit idt.com/P9025AC-R-EVK to learn
more.
Figure 1. Reference Board Illustration
5W QI WIRELESS POWER TRANSMITTER REFERENCE BOARD 2 09/23/15
P9038-R-EVK REFERENCE BOARD MANUAL
Usage Guide
This reference board is designed to demonstrate the
performance and functionality of the P9038 as a
fully-functional Qi-compliant wireless power transmitter pad.
In most cases, this board can be wired into an existing system
for evaluation and prototyping.
Quick Start Guide
Follow these simple steps to power-up and begin using the
P9038-R-EVK board:
1. Connect a 5 Volt, 2 Amp micro-USB charger to the
board
Note: lower-power sources can be used, but will limit
the maximum po we r tra ns fe r.
2. Place a Qi-compatible receiver on top of the plastic
coil spacer
3. Verify that the green LED is blinking – coupling has
been established
Input Power Supply
The P9038-R-EVK features a micro-USB input connector as
the primary power source. This connector was selected
because micro-USB adapters are commonly available in most
offices and labs. If preferred, an alternative 5 V power supply
can be wired directly into the VIN and GND test points.
An optional MOSFET (Q6) is connected in series with the
micro-USB connector (J4). While the MOSFET is not required
for operating the P9038 from a USB adapter, it is required for
strict USB compliance, serving to limit inrush current and
provide over-voltage protection for anything over 12 V DC.
IDT recommends using the MOSFET if the board might draw
power from a standard USB port, such as from a USB
connector on a laptop or PC. If the application will not be
powered by a standard USB port, and the input voltage can be
controlled not to exceed 12 V DC, then the series MOSFET
can be removed.
EEPROM Configuration
The EEPROM on the P9038-R-EVK board is programmed
with a standard configuration optimized for the reference
layout and coil. This configuration is automatically loaded into
the P9038 device registers when power is applied.
Flexibility to tailor the device behavior to a specific application
can be accomplished by using external resistors to select the
LED mode and FOD offset. Details about the default
configuration and selectable modes and offsets can be found
in the P9038 product datasheet.
Qi Compliance & Certification
The P9038-R-EVK reference board is designed to be
compliant to the WPC 1.1.5 Qi specification, but it is not
Qi-certified. This distinction is important because a Qi-certified
product has completed a strict interoperability testing protocol
in its final form factor. That means, the product containing this
board or using the reference layout and bill-of-materials
should be certified separately.
With that said, the P9038-R-EVK provides all of the necessary
features and flexibility needed to attain Qi-certification. By
using the provided reference design, a system prototype can
be created with minimal changes, and thus, minimal
engineering risk.
To learn more about attaining Qi-certification, visit:
http://www.wirelesspowerconsortium.com/developers/produc
t-testing-and-registration.html
LED Status Indicators
The P9038-R-EVK is equipped with two LED status indicators:
green and red. A red LED indicates various Fault and FOD
("Foreign Object Detection") states. The green LED indicates
Power Transfer and Charge Complete state information. Upon
power up, the two LEDs together may optionally indicate the
Standby State and remain in this state until another of the
defined Operational States occurs.
The P9038 offers several LED control options that are
configurable by the external resistor network on the GPIO3
pin. The stock P9038-R-EVK reference board has a pull down
(R21) to GND, and therefore, is pre-configured to LED Control
Option 1. The status indicators behave as follows:
To learn more about different LED control options, refer to the
P9038 product datasheet. If desired, the brightness of the
LEDs can be increased by lowering the value of resistors R12
and R14.
Green LED Red LED
Standby On On
Transfer Blink 1 Hz Off
Complete One Off
CS100 Blink 0.5 Hz Off
Power Blink 2 Hz Off
Fault Off Blink 4 Hz
09/23/15 3 5W QI WIRELESS POWER TRANSMITTER REFERENCE BOARD
P9038-R-EVK REFERENCE BOARD MANUAL
Test Point Accessibility
The P9038-R-EVK reference board was designed so that the
core layout could be easily copied to an existing system board
design. For this reason, all of the necessary inputs and
outputs are placed toward the edge of the board to eliminate
uncertainty in escape routing. For more information about
copying the digital layout files, refer to application note
AN-894 P9038 Layout Guidelines.
When prototyping using the direct VIN and GND vias instead
of the micro-USB input, it is important to use a low-resistance
wire that is rated for the expected input current. This will avoid
damage to the wire and minimize voltage drops on its way to
the input.
Plastic Coil Spacer
A good wireless power transfer system should maintain a
small separation gap between the transmitter coil and the
receiver coil. The Qi specification requires a separation gap of
1.75 to 2.5 mm on the transmitter. For the reference board, a
plastic square has been glued to the top of the coil to mimic
the separation typically achieved by the final product casing.
Although the coil itself is protected by non-conductive
encapsulation, it is recommended to use the plastic spacer to
archive optimal power transfer efficiency.
For prototyping, it may be useful to remove the plastic spacer.
This is easily done by simply prying it off with your fingers. The
coil ferrite is also glued to the board, so it's a good idea to push
down on the ferrite while you slowly lift off the plastic. To see
a video demonstration, visit: idt.com/P9038-R-EVK
Separating the Coil from the Board
The P9038-R-EVK reference board has been precisely tuned
for the stock coil attached to the PCB. The PCB material that
extends under the coil ferrite is for physical stability only. The
board has been designed with a score line enabling users to
snap-off of the PCB section on which the coil ferrite is glued.
This can be done by carefully placing the board on the edge
of a table and applying downward pressure on the coil.
It is also possible to remove the PCB from the bottom of the
ferrite. This is easily done by prying the two components apart.
While doing this, take care not to damage the coil leads. In
some cases, especially when planning to extend the coil
leads, it's best to unsolder the coil leads from the PCB prior to
snapping or separating the PCB. In addition, any wires used
to extend the leads of the coil should be twisted to help cancel
the inductance of the new wire.
To see a video demonstration of separating the coil mount or
removing the coil from the board, visit: idt.com/P9038-R-EVK
Minimizing the Physical PCB Area
When space is limited, the P9038-R-EVK board can be made
smaller in two ways. First, the coil can be separated from the
board as explained in the section titled "Separating the Coil
from the Board". Second, there are two areas on the edge of
the component area that can be sawed off. There is no active
circuitry in these areas. To see a video demonstration, visit:
idt.com/P9038-R-EVK
Physical Specifications
The following specifications are based on the Gerber files:
•Width: 53.5 mm
•Component area length (from edge to score line): 28.8 mm
•Total board length (from edge to edge): 84.4 mm
•PCB thickness: 0.80 mm
The following specifications were measured by hand on one
board sample using the Wurth Elektronik coil 760308111.
These values are for estimation purposes only. Actual
specifications may vary.
•Thickness of active circuit (components and solder, not
including coil): ~ 4 mm
•Total thickness (including coil, plastic spacer, and rubber
feet): ~ 10 mm
•Total weight (including plastic spacer and rubber feet): ~ 68
grams
Note that the thickness of the solution can be minimized when
the rubber feet, coil mount, and plastic spacer have been
removed so that the coil ferrite is sitting next to the active
circuit area. In that case, the total thickness of the solution is
dependent on the thickness of the coil or components.
5W QI WIRELESS POWER TRANSMITTER REFERENCE BOARD 4 09/23/15
P9038-R-EVK REFERENCE BOARD MANUAL
Board Schematic
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
LEDA
LEDB
Integrated Device Technology, Inc.
THIS DOCUMENT CONTAINS INFORMATION PROPRIETARY
TO Integrated Device Technology, Inc. (IDT).
USE OR DISCLOSURE WITHOUT THE WRITTEN
PERMISSION OF AN OFFICER OF IDT IS
EXPRESSLY FORBIDDEN
DO NOT MODIFY THE VOLTAGE
SPECIFICATION OF CAPACITORS:
C13,C18,C17,C15,C19,C20,C29,C30
P9038-R-EVK V1.1
OPTIONAL
FOD Tuning Resistors
Tx COIL
SCL
WP
SDA
ISNS
LDO5V
LDO2P5V
GPIO0
GPIO5
GPIO4
GPIO2
GPIO3
RESET
Title
Size Document Number Re v
Date: Sheet of
305-PD-15-0260
1
P9038-R-EVK V1.1
B
22Wednesday, July 15, 2015
Title
Size Document Number Re v
Date: Sheet of
305-PD-15-0260
1
P9038-R-EVK V1.1
B
22Wednesday, July 15, 2015
Title
Size Document Number Re v
Date: Sheet of
305-PD-15-0260
1
P9038-R-EVK V1.1
B
22Wednesday, July 15, 2015
VIN
IO6
R21
47K R9
10K
R15
47K
R5 33
R1
10M
R7
47K
5%
C25
6.8nF
C11
6.8nF
IO5
C27
0.1uF
R11
15K
IO4
C31
0.1uF
C24
1uF
0402
U1
P9038
SW2_b 31
PGND2_a 26
SW2_d 33
SW2_c 32
GPIO4
5
IN_a 34
IN_b 35
GPIO6
3
NC
2
GPIO5
4
GPIO1 8
GPIO0
9
DP
12
PGND2_d 29
SW2_a 30
PGND2_b 27
SCL
10
GPIO3
6
SDA
11
GPIO2
7
PGND2_c 28
PGND1_a 42
BST2 25
IN_c 36
IN_d 37
SW1_a 38
SW1_b 39
SW1_c 40
DM
13
RESET
14
VBUS_SNS
15
EN
16
REFGND
17
REG_IN 18
LDO5V
19
LDO2P5V
20
LDO2P5V_IN
21
INV5V_IN
22
OVP_SEL
23
VSNS_AVG
24
BST1 46
PGND1_d 45
PGND1_c 44
SW1_d 41
PGND1_b 43
GATE 47
ISNS_AVG
48
ISNSN_IN 49
GND_a
1
ISNSP_IN 50
SHIELD1 51
HPF 52
SHIELD2 53
GND_c
54
ISNS 55
GND_b
56
EPAD
57
C26
1uF
0402
C4
6.8nF
C12
3.3nF
C1
6.8nF
C10
0.1uF
R18
NP
R27
0
C22
1uF
R23
4.7K
R4
22
C2
6.8nF
R20
NP
C20
100nF 1206
50V
GND
Q6
FDC8878
1
2
3
6
5
4
R17
1.5K
R8 33
GND1
C30
100nF 1206
50V
R26
0
THER
1 2
/EN
IO3
U3
24AA64T-I/MNY
VSS
4A2
3
A0
1
A1
2VCC 8
WP 7
SCL 6
SDA 5
EPAD
9
C5
0.1uF
R24
4.7K
WP
C13
10uF
IO0
C14
22nF
C18
0.1uF
LDO5V
D6
CDSU400B
0603
D3
GREEN
C29
100nF 1206
50V
R22
47K
C15
10uF
R10
10K
R12
4.7K
C3
6.8nF
L1
6.5uH
R25
10K
C28
22nF
IO2
C16
3.3nF
C9
3.3nF
R3
22
C6
1nF
C23
0.1uF
C17
10uF
HPFC
C8
1nF
R2
0.01
C21
0.1uF
R6
10M
SLD
SLD
VCC
D-
D+
ID
GND
J4
usb_micro_ab
1
2
3
4
56
7
8
9
10
11
C19
100nF 1206
50V
C7
22nF
SCL
R13
47K
D1
RED
SDA
R16
NP
R14
4.7K
RESET
R19
10K
09/23/15 5 5W QI WIRELESS POWER TRANSMITTER REFERENCE BOARD
P9038-R-EVK REFERENCE BOARD MANUAL
Component Map
5W QI WIRELESS POWER TRANSMITTER REFERENCE BOARD 6 09/23/15
P9038-R-EVK REFERENCE BOARD MANUAL
Symbol Value Purpose Part Number
C1 6.8nF Delay setting capacitor for soft-on GRM155R71E682KA01D
C2 6.8nF USB connector high frequency bypass GRM155R71E682KA01D
C3 6.8nF High frequency bypass for current sensing input GRM155R71E682KA01D
C4 6.8nF High frequency bypass for current sensing input GRM155R71E682KA01D
C5 0.1µF Low pass filter for current sensing input GRM155R71C104KA88D
C6 1nF Low pass filter for current sensing output GRM155R71C102KA01D
C7 22nF Slew rate limiting capacitor for SW2 switching node CL05B223KA5NNNC
C8 1nF Demodulation third-stage low pass filter GRM155R71C102KA01D
C9 3.3nF Low pass filter for ISNS output C0402C332K3RACTU
C10 0.1µF Boost capacitor for switching node driver stage GRM155R71C104KA88D
C11 6.8nF High-Pass filter for HPF input GRM155R71E682KA01D
C12 3.3nF Demodulation second-stage low pass filter C0402C332K3RACTU
C13 10µF DC input bulk capacitor GRM21BR61C106KE15L
C14 22nF DC blocking for demodulation peak detector GRM155R71H223KA12J
C15 10µF DC input bulk capacitor GRM21BR61C106KE15L
C16 3.3nF Demodulation peak detector first-stage low pass filter C1005X7R1H332K050BA
C17 10µF DC input bulk capacitor GRM21BR61C106KE15L
C18 0.1µF DC input bypass capacitor GRM155R71C104KA88D
C19 100nF Series-resonant LC tank capacitor C3216C0G1H104J160AA
C20 100nF Series-resonant LC tank capacitor C3216C0G1H104J160AA
C21 0.1µF Boost capacitor for switching node driver stage GRM155R71C104KA88D
C22 1µF 5Vdc Voltage regulator input bypass C1005X5R1C105K050BC
C23 0.1µF 5Vdc Voltage regulator input bypass GRM155R71C104KA88D
C24 1µF 5Vdc voltage regulator output bulk capacitor C1005X5R1C105K050BC
C25 6.8nF DC input voltage measurement filter capacitor GRM155R71E682KA01D
C26 1µF 2.5Vdc voltage regulator output bulk capacitor C1005X5R1C105K050BC
C27 0.1µF Low pass filter for optional thermistor circuit CL05A104MP5NNNC
C28 22nF Slew rate limiting capacitor for SW2 switching node CL05B223KA5NNNC
C29 100nF Series-resonant LC tank capacitor C3216C0G1H104J160AA
C30 100nF Series-resonant LC tank capacitor C3216C0G1H104J160AA
C31 0.1µF Bypass capacitor for EEPROM device CL05A104MP5NNNC
D1 RED Red user interface indicating LED 150060SS75000
D3 GREEN Green user interface indicating LED 150060VS75000
D6 CDSU400B CDSU400B
/EN 30AWG –
GND 30AWG –
GND1 30AWG –
HPFC 30AWG –
IO0 30AWG –
IO2 30AWG –
IO3 30AWG –
IO4 30AWG –
09/23/15 7 5W QI WIRELESS POWER TRANSMITTER REFERENCE BOARD
P9038-R-EVK REFERENCE BOARD MANUAL
A detailed bill-of-materials (BOM) spreadsheet can be found at www.idt.com/P9038-R-EVK
IO5 30AWG –
IO6 30AWG –
J4 5P 629105150921
L1 6.5uH Primary coil for LC tank 760308111
LDO5V 30AWG –
Q6 FDC8878 Inrush current limiting transistor FDC8878
R1 10M Guaranteed turn-off leakage for inrush current limiter RC1005F106CS
R2 0.01 Current sensing resistor ERJ-6BWFR010V
R3 22 Low-pass filter for current sensing input RC0402JR-0722RL
R4 22 Low-pass filter for current sensing input RC0402JR-0722RL
R5 33 Current limiting resistor for DM input pin RC1005J330CS
R6 10 MΩLeakage path for SHIELD1 pin RC1005F106CS
R7 47 kΩDemodulation second-stage low pass filter ERJ-2GEJ473X
R8 33 Current limiting resistor for DP input pin RC1005J330CS
R9 10 kΩDemodulation third-stage low pass filter RC0402FR-0710KL
R10 10 kΩFirst stage demodulation high-pass filter CRCW040210K0JNED
R11 15 kΩDemodulation peak detector leakage resistor ERJ-2RKF1502X
R12 4.7 kΩCurrent limiting resistor for Red LED ERJ-2GEJ472X
R13 47 kΩLow-side resistor for LED mode setting ERJ-3GEYJ473V
R14 4.7 kΩCurrent limiting resistor for Green LED ERJ-2GEJ472X
R15 47 kΩPull-down for Enable pin ERJ-3GEYJ473V
R16 NP High-side resistor for LED mode setting –
R17 1.5 kΩDemodulation peak detector first stage low-pass filter ERJ-2RKF1501X
R18 NP Overvoltage shutoff limit option setting resistor –
R19 10 kΩPrecision pull-up for thermistor circuit option CRCW040210K0JNED
R20 NP High-side resistor for FOD adjustment option –
R21 47 kΩLow-side resistor for FOD adjustment option ERJ-3GEYJ473V
R22 47 kΩPull-down for Reset pin ERJ-3GEYJ473V
R23 4.7 kΩPull-up for SDA pin ERJ-2GEJ472X
R24 4.7 kΩPull-up for SCL pin ERJ-2GEJ472X
R25 10 kΩPull-up for EEPROM Write-Pulse pin CRCW040210K0JNED
R26 0.0 ΩERJ-2GE0R00X
R27 0.0 ΩERJ-2GE0R00X
RESET 30AWG –
SCL 30AWG –
SDA 30AWG –
THER NP Optional thermistor for temperature sensing circuit B57551G0103f000
U1 P9038 Single-chip wireless power device P9038-RNDGI
U3 24AA64T-I/MNY EEPROM for firmware program storage 24AA64T-I/MNY
VIN 30AWG –
WP 30AWG –
Symbol Value Purpose Part Number
5W QI WIRELESS POWER TRANSMITTER REFERENCE BOARD 8 09/23/15
P9038-R-EVK REFERENCE BOARD MANUAL
Top Layer
09/23/15 9 5W QI WIRELESS POWER TRANSMITTER REFERENCE BOARD
P9038-R-EVK REFERENCE BOARD MANUAL
Bottom Layer
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this document, including descriptions of product features and performance, is subject to change without notice. Performance specifications and the operating parameters of the described products are determined
in the independent state and are not guaranteed to perform the same way when installed in customer products. The information contained herein is provided without representation or warranty of any kind, whether
express or implied, including, but not limited to, the suitability of IDT’s products for any particular purpose, an implied warranty of merchantability, or non-infringement of the intellectual property rights of others. This
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