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About the Document
History
Revision
Date
Author
Description
1.0
2013-07-17
Mountain ZHOU
Initial
1.1
2013-08-29
Mountain ZHOU
1. Updated USB driver information.
2. Added GNSS contents in Chapter 4.
3. Added GNSS current consumption.
4. Updated GNSS antenna requirements.
5. Released USIM_PRESENCE function.
1.2
2014-01-21
Mountain ZHOU
1. Added UC20-G information.
2. Added AMR-WB feature.
3. Added USB upgrade test points’ diagram.
4. Added reference design of transistor circuit on
UART interface.
5. Deleted debug function of Debug UART
interface.
6. Released AP_READY, main UART upgrade
function and Rx-diversity function.
7. Modified UC20-A frequency bands.
8. Modified W_DISABLE# definition.
9. Modified GNSS sensitivity definition.
10. Modified turning on timing figure.
11. Added power saving methods in Sleep Mode
in Chapter 3.5.1.
12. Updated airplane mode in Chapter 3.5.2.
13. Updated I2C pins definition.
14. Updated current consumption.
1.3
2014-03-05
Mountain ZHOU
1. Modified VDD_2V85 pin definition and GNSS
LNA design circuit.
2. Added notes about UC20 versions in Chapter
2.1.
3. Added description about the sleep mode in
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Chapter 3.16.2.
4. Updated power circuit of Figure 6.
5. Updated current consumption.
1.4
2014-10-22
Mountain ZHOU
1. Updated internet protocol features and USB
driver.
2. Updated VBAT input voltage range.
3. Updated Chapter 3.6.2, and added VBAT
drop figure.
4. Updated antenna requirement in Chapter
5.3.1.
5. Updated current consumption.
6. Updated recommended footprint in Chapter
7.2.
7. Deleted description of UART autobauding.
8. Deleted Chapter of USIM connector.
9. Changed TXB0108 chip to TXS0108 chip.
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Contents
About the Document ................................................................................................................................... 2
Contents ....................................................................................................................................................... 4
Table Index ................................................................................................................................................... 6
Figure Index ................................................................................................................................................. 7
1 Introduction .......................................................................................................................................... 9
1.1. Safety Information.................................................................................................................... 10
2 Product Concept ................................................................................................................................ 11
2.1. General Description ................................................................................................................. 11
2.2. Key Features ........................................................................................................................... 12
2.3. Functional Diagram ................................................................................................................. 14
2.4. Evaluation Board ..................................................................................................................... 15
3 Application Interface ......................................................................................................................... 16
3.1. General Description ................................................................................................................. 16
3.2. Pin Assignment ........................................................................................................................ 17
3.3. Pin Description ......................................................................................................................... 18
3.4. Operating Modes ..................................................................................................................... 24
3.5. Power Saving ........................................................................................................................... 25
3.5.1. Sleep Mode .................................................................................................................... 25
3.5.1.1. UART Application ................................................................................................. 25
3.5.1.2. USB Application with Suspend Function ............................................................. 26
3.5.1.3. USB Application without Suspend Function ........................................................ 26
3.5.2. Airplane Mode ................................................................................................................ 27
3.6. Power Supply ........................................................................................................................... 28
3.6.1. Power Supply Pins ......................................................................................................... 28
3.6.2. Decrease Voltage Drop .................................................................................................. 28
3.6.3. Reference Design for Power Supply .............................................................................. 29
3.6.4. Monitor the Power Supply .............................................................................................. 30
3.7. Turn on and off Scenarios ....................................................................................................... 30
3.7.1. Turn on Module Using the PWRKEY ............................................................................. 30
3.7.2. Turn off Module .............................................................................................................. 32
3.7.2.1. Turn off Module Using the PWRKEY Pin ............................................................. 32
3.7.2.2. Turn off Module Using AT Command ................................................................... 33
3.7.2.3. Automatic Shutdown ............................................................................................ 33
3.8. Reset the Module..................................................................................................................... 34
3.9. RTC Backup............................................................................................................................. 36
3.10. UART Interface ........................................................................................................................ 37
3.11. USIM Card Interface ................................................................................................................ 40
3.12. USB Interface .......................................................................................................................... 43
3.13. PCM and I2C Interface ............................................................................................................ 44
3.14. ADC Function .......................................................................................................................... 47
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3.15. Network Status Indication ........................................................................................................ 48
3.16. Operating Status Indication ..................................................................................................... 49
3.16.1. STATUS .......................................................................................................................... 49
3.16.2. SLEEP_IND.................................................................................................................... 49
3.17. Behavior of the RI .................................................................................................................... 51
4 GNSS Receiver ................................................................................................................................... 52
4.1. General Description ................................................................................................................. 52
4.2. GNSS Performance ................................................................................................................. 53
4.3. Layout Guideline ...................................................................................................................... 54
5 Antenna Interface ............................................................................................................................... 55
5.1. GSM/UMTS Antenna Interface ................................................................................................ 55
5.1.1. Pin Definition .................................................................................................................. 55
5.1.2. Operating Frequency ..................................................................................................... 55
5.1.3. Reference Design .......................................................................................................... 56
5.2. GNSS Antenna Interface ......................................................................................................... 57
5.2.1. Reference Design for Passive Antenna ......................................................................... 57
5.2.2. Reference Design for Active Antenna ............................................................................ 58
5.3. Antenna Installation ................................................................................................................. 58
5.3.1. Antenna Requirement .................................................................................................... 58
5.3.2. Install the Antenna with RF Connector .......................................................................... 59
6 Electrical, Reliability and Radio Characteristics ............................................................................ 61
6.1. Absolute Maximum Ratings ..................................................................................................... 61
6.2. Power Supply Ratings ............................................................................................................. 61
6.3. Operating Temperature ............................................................................................................ 62
6.4. Current Consumption .............................................................................................................. 62
6.5. RF Output Power ..................................................................................................................... 66
6.6. RF Receiving Sensitivity .......................................................................................................... 67
6.7. Electrostatic Discharge ............................................................................................................ 67
7 Mechanical Dimensions .................................................................................................................... 68
7.1. Mechanical Dimensions of the Module.................................................................................... 68
7.2. Footprint of Recommendation ................................................................................................. 71
7.3. Top View of the Module ........................................................................................................... 72
7.4. Bottom View of the Module ...................................................................................................... 72
8 Storage and Manufacturing .............................................................................................................. 73
8.1. Storage..................................................................................................................................... 73
8.2. Manufacturing and Welding ..................................................................................................... 73
8.3. Packaging ................................................................................................................................ 74
9 Appendix A Reference ....................................................................................................................... 76
10 Appendix B GPRS Coding Scheme ................................................................................................. 80
11 Appendix C GPRS Multi-slot Class .................................................................................................. 81
12 Appendix D EDGE Modulation and Coding Scheme ..................................................................... 82
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Table Index
TABLE 1: UC20 SERIES FREQUENCY BANDS ............................................................................................... 11
TABLE 2: UC20 KEY FEATURES ..................................................................................................................... 12
TABLE 3: IO PARAMETERS DEFINITION ........................................................................................................ 18
TABLE 4: PIN DESCRIPTION ........................................................................................................................... 18
TABLE 5: OVERVIEW OF OPERATING MODES ............................................................................................. 24
TABLE 6: VBAT AND GND PINS ....................................................................................................................... 28
TABLE 7: PWRKEY PIN DESCRIPTION .......................................................................................................... 30
TABLE 8: RESET_N PIN DESCRIPTION ......................................................................................................... 34
TABLE 9: PIN DEFINITION OF THE MAIN UART INTERFACE ....................................................................... 37
TABLE 10: PIN DEFINITION OF THE DEBUG UART INTERFACE ................................................................. 38
TABLE 11: LOGIC LEVELS OF DIGITAL I/O .................................................................................................... 38
TABLE 12: PIN DEFINITION OF THE USIM INTERFACE ............................................................................... 40
TABLE 13: USB PIN DESCRIPTION ................................................................................................................ 43
TABLE 14: PIN DEFINITION OF PCM AND I2C INTERFACE .......................................................................... 46
TABLE 15: PIN DEFINITION OF THE ADC ...................................................................................................... 47
TABLE 16: CHARACTERISTIC OF THE ADC .................................................................................................. 47
TABLE 17: PIN DEFINITION OF NETWORK INDICATOR ............................................................................... 48
TABLE 18: WORKING STATE OF THE NETWORK INDICATOR..................................................................... 48
TABLE 19: PIN DEFINITION OF STATUS ........................................................................................................ 49
TABLE 20: PIN DEFINITION OF SLEEP_IND .................................................................................................. 50
TABLE 21: BEHAVIOR OF THE RI ................................................................................................................... 51
TABLE 22: GNSS PERFORMANCE ................................................................................................................. 53
TABLE 23: PIN DEFINITION OF THE RF ANTENNA ....................................................................................... 55
TABLE 24: THE MODULE OPERATING FREQUENCIES ................................................................................ 55
TABLE 25: PIN DEFINITION OF GNSS ANTENNA .......................................................................................... 57
TABLE 26: GNSS FREQUENCY ....................................................................................................................... 57
TABLE 27: ANTENNA REQUIREMENTS .......................................................................................................... 59
TABLE 28: ABSOLUTE MAXIMUM RATINGS .................................................................................................. 61
TABLE 29: THE MODULE POWER SUPPLY RATINGS .................................................................................. 61
TABLE 30: OPERATING TEMPERATURE ........................................................................................................ 62
TABLE 31: THE MODULE CURRENT CONSUMPTION .................................................................................. 63
TABLE 32: CONDUCTED RF OUTPUT POWER ............................................................................................. 66
TABLE 33: CONDUCTED RF RECEIVING SENSITIVITY ................................................................................ 67
TABLE 34: ELECTROSTATICS DISCHARGE CHARACTERISTICS ............................................................... 67
TABLE 35: RELATED DOCUMENTS ................................................................................................................ 76
TABLE 36: TERMS AND ABBREVIATIONS ...................................................................................................... 76
TABLE 37: DESCRIPTION OF DIFFERENT CODING SCHEMES .................................................................. 80
TABLE 38: GPRS MULTI-SLOT CLASSES ...................................................................................................... 81
TABLE 39: EDGE MODULATION AND CODING SCHEME ............................................................................. 82
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Figure Index
FIGURE 1: FUNCTIONAL DIAGRAM ............................................................................................................... 15
FIGURE 2: PIN ASSIGNMENT (TOP VIEW) .................................................................................................... 17
FIGURE 3: UART SLEEP APPLICATION ......................................................................................................... 25
FIGURE 4: USB APPLICATION WITH SUSPEND FUNCTION ........................................................................ 26
FIGURE 5: USB SLEEP APPLICATION WITHOUT SUSPEND FUNCTION .................................................... 27
FIGURE 6: VOLTAGE DROP DURING TRANSMITTING BURST .................................................................... 29
FIGURE 7: STAR STRUCTURE OF THE POWER SUPPLY............................................................................ 29
FIGURE 8: REFERENCE CIRCUIT OF POWER SUPPLY .............................................................................. 30
FIGURE 9: TURN ON THE MODULE USING DRIVING CIRCUIT ................................................................... 31
FIGURE 10: TURN ON THE MODULE USING KEYSTROKE ......................................................................... 31
FIGURE 11: TIMING OF TURNING ON MODULE ........................................................................................... 32
FIGURE 12: TIMING OF TURNING OFF MODULE ......................................................................................... 33
FIGURE 13: REFERENCE CIRCUIT OF RESET_N BY USING DRIVING CIRCUIT ...................................... 35
FIGURE 14: REFERENCE CIRCUIT OF RESET_N BY USING BUTTON ...................................................... 35
FIGURE 15: TIMING OF RESETTING MODULE ............................................................................................. 35
FIGURE 16: RTC SUPPLY FROM NON-CHARGEABLE BATTERY ................................................................ 36
FIGURE 17: RTC SUPPLY FROM RECHARGEABLE BATTERY .................................................................... 36
FIGURE 18: RTC SUPPLY FROM CAPACITOR .............................................................................................. 37
FIGURE 19: REFERENCE CIRCUIT WITH TRANSLATOR CHIP ................................................................... 39
FIGURE 20: REFERENCE CIRCUIT WITH TRANSISTOR CIRCUIT .............................................................. 39
FIGURE 21: RS232 LEVEL MATCH CIRCUIT .................................................................................................. 40
FIGURE 22: REFERENCE CIRCUIT OF THE 8 PIN USIM CARD ................................................................... 41
FIGURE 23: REFERENCE CIRCUIT OF THE 6 PIN USIM CARD ................................................................... 42
FIGURE 24: REFERENCE CIRCUIT OF USB APPLICATION ......................................................................... 43
FIGURE 25: TEST POINTS OF FIRMWARE UPGRADE ................................................................................. 44
FIGURE 26: PRIMARY MODE TIMING ............................................................................................................ 45
FIGURE 27: AUXILIARY MODE TIMING .......................................................................................................... 45
FIGURE 28: REFERENCE CIRCUIT OF PCM APPLICATION WITH AUDIO CODEC .................................... 46
FIGURE 29: REFERENCE CIRCUIT OF THE NETWORK INDICATOR .......................................................... 48
FIGURE 30: REFERENCE CIRCUIT OF THE STATUS ................................................................................... 49
FIGURE 31: REFERENCE CIRCUIT OF THE SLEEP_IND ............................................................................. 50
FIGURE 32: RELATIONSHIP BETWEEN SLEEP AND NETWORK PAGING .................................................. 50
FIGURE 33: REFERENCE CIRCUIT OF ANTENNA INTERFACE ................................................................... 56
FIGURE 34: REFERENCE CIRCUIT OF GNSS PASSIVE ANTENNA ............................................................. 57
FIGURE 35: REFERENCE CIRCUIT OF GNSS ACTIVE ANTENNA ............................................................... 58
FIGURE 36: DIMENSIONS OF THE UF.L-R-SMT CONNECTOR (UNIT: MM) ................................................ 59
FIGURE 37: MECHANICALS OF UF.L-LP CONNECTORS ............................................................................. 60
FIGURE 38: SPACE FACTOR OF MATED CONNECTOR (UNIT: MM) ........................................................... 60
FIGURE 39: UC20 TOP AND SIDE DIMENSIONS ........................................................................................... 68
FIGURE 40: UC20 BOTTOM DIMENSIONS (BOTTOM VIEW) ....................................................................... 69
FIGURE 41: BOTTOM PADS DIMENSIONS (BOTTOM VIEW) ....................................................................... 70
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FIGURE 42: RECOMMENDED FOOTPRINT (TOP VIEW) .............................................................................. 71
FIGURE 43: TOP VIEW OF THE MODULE ...................................................................................................... 72
FIGURE 44: BOTTOM VIEW OF THE MODULE .............................................................................................. 72
FIGURE 45: LIQUIDS TEMPERATURE ............................................................................................................ 74
FIGURE 46: CARRIER TAPE ............................................................................................................................ 75
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1 Introduction
This document defines the UC20 module and describes its hardware interface which are connected with
your application and the air interface.
This document can help you quickly understand module interface specifications, electrical and
mechanical details. Associated with application notes and user guide, you can use UC20 module to
design and set up mobile applications easily.
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1.1. Safety Information
The following safety precautions must be observed during all phases of the operation, such as usage,
service or repair of any cellular terminal or mobile incorporating UC20 module. Manufacturers of the cellular
terminal should send the following safety information to users and operating personnel and to incorporate
these guidelines into all manuals supplied with the product. If not so, Quectel does not take on any liability
for customer failure to comply with these precautions.
Full attention must be given to driving at all times in order to reduce the risk of an
accident. Using a mobile while driving (even with a handsfree kit) cause distraction
and can lead to an accident. You must comply with laws and regulations restricting
the use of wireless devices while driving.
Switch off the cellular terminal or mobile before boarding an aircraft. Make sure it
switched off. The operation of wireless appliances in an aircraft is forbidden to
prevent interference with communication systems. Consult the airline staff about
the use of wireless devices on boarding the aircraft, if your device offers a Airplane
Mode which must be enabled prior to boarding an aircraft.
Switch off your wireless device when in hospitals or clinics or other health care
facilities. These requests are desinged to prevent possible interference with
sentitive medical equipment.
Cellular terminals or mobiles operate over radio frequency signal and cellular
network and cannot be guaranteed to connect in all conditions, for example no
mobile fee or an invalid SIM card. While you are in this condition and need
emergent help, please remember using emergency call. In order to make or
receive call, the cellular terminal or mobile must be switched on and in a service
area with adequate cellular signal strength.
Your cellular terminal or mobile contains a transmitter and receiver. When it is ON ,
it receives and transmits radio frequency energy. RF interference can occur if it is
used close to TV set, radio, computer or other electric equipment.
In locations with potencially explosive atmospheres, obey all posted signs to turn
off wireless devices such as your phone or other cellular terminals. Areas with
potencially exposive atmospheres including fuelling areas, below decks on boats,
fuel or chemical transfer or storage facilities, areas where the air contains
chemicals or particles such as grain, dust or metal powders.
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2 Product Concept
2.1. General Description
UC20 is an embedded HSPA+/EDGE engine with Rx-diversity. Its UMTS-based modem provides data
connectivity on HSPA+, HSDPA, HSUPA, WCDMA, EDGE, GPRS networks. It can also provide
GPS/GLONASS and voice functionality1) for your specific application. UC20 offers a maximum data rate
of 14.4Mbps on downlink and 5.76Mbps on uplink in HSPA+/HSPA mode. UC20 also support
GPRS/EDGE multi-slot class 12. GPRS supports the coding schemes CS-1, CS-2, CS-3 and CS-4.
EDGE supports CS1-4 and MCS1-9 coding schemes. UC20 contains three variants UC20-A, UC20-E
and UC20-G. You can choose the dedicated type based on the wireless network configuration. The
following table shows the entire radio band configuration of UC20 series.
Table 1: UC20 Series Frequency Bands
1). UC20 series (UC20-A/UC20-E/UC20-G) includes Data-only and Telematics versions. Data-only
version does not support voice function, Telematics version supports it.
More details about GPRS/EDGE multi-slot configuration and coding schemes, please refer to Appendix B,
C and D.
With a tiny profile of 32.0mm × 29.0mm × 2.5mm, UC20 can meet almost all requirements for M2M
application such as automotive, metering, tracking system, security solutions, routers, wireless POS,
mobile computing devices, PDA phone and tablet PC, etc..
Module
GSM
850
EGSM
900
DCS
1800
PCS
1900
UMTS
800
UMTS
850
UMTS
900
UMTS
1900
UMTS
2100
Rx-
diversity
GNSS
UC20-A
UC20-E
UC20-G
NOTE
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UC20 is an SMD type module, which can be embedded in application through its 112-pin pads including
72 LCC signal pads and 40 other pads.
UC20 is integrated with internet service protocols like TCP/UDP and PPP. Extended AT commands have
been developed for customer to use these internet service protocols easily.
2.2. Key Features
The following table describes the detailed features of UC20 module.
Table 2: UC20 Key Features
Feature
Details
Power Supply
Supply voltage: 3.3V~4.3V
Typical supply voltage: 3.8V
Frequency Bands
UC20-A: UMTS850/1900
UC20-E: GSM850/900/1800/1900, UMTS900/2100
UC20-G: GSM850/900/1800/1900, UMTS800/850/900/1900/2100
Transmission Data
HSPA R6: Max 14.4Mbps (DL)/Max 5.76Mbps (UL)
UMTS R99: Max 384kbps (DL)/Max 384kbps (UL)
EDGE: Max 236.8kbps (DL)/Max 236.8kbps (UL)
GPRS: Max 85.6kbps (DL)/Max 85.6kbps (UL)
CSD: 14.4kbps
Transmitting Power
Class 4 (33dBm±2dB) for GSM850 and EGSM900
Class 1 (30dBm±2dB) for DCS1800 and PCS1900
Class E2 (27dBm±3dB) for GSM850 and EGSM900 8-PSK
Class E2 (26dBm+3/-4dB) for DCS1800 and PCS1900 8-PSK
Class 3 (24dBm+1/-3dB) for UMTS800/850/900/1900/2100
HSPA and UMTS Features
HSPA data rate is corresponded with 3GPP R6. 14.4Mbps on downlink
and 5.76Mbps on uplink.
WCDMA data rate is corresponded with 3GPP R99/R4. 384kbps on
downlink and 384kbps on uplink.
Support both 16-QAM and QPSK modulation.
GSM/GPRS/EDGE
Data Features
GPRS:
Support GPRS multi-slot class 12 (10 by default)
Coding scheme: CS-1, CS-2, CS-3 and CS-4
Maximum of four Rx time slots per frame
EDGE:
Support EDGE multi-slot class 12 (12 by default).
Support GMSK and 8-PSK for different MCS (Modulation and Coding
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scheme).
Downlink coding schemes: CS 1-4 and MCS 1-9
Uplink coding schemes: CS 1-4 and MCS 1-9
CSD:
CSD transmission rates: 14.4kbps non-transparent
Support Unstructured Supplementary Services Data (USSD).
Internet Protocol Features
Support TCP/UDP/PPP/FTP/SMTP/HTTP/FILE/MMS/SSL protocols
Support the protocols PAP (Password Authentication Protocol) and
CHAP (Challenge Handshake Authentication Protocol) usually used
for PPP connections.
SMS
Text and PDU mode
Point to point MO and MT
SMS cell broadcast
SMS storage: ME by default
USIM Interface
Support USIM/SIM card: 1.8V, 3.0V
Audio Features
Support one digital audio interface: PCM interface
GSM: HR/FR/EFR/AMR/AMR-WB
WCDMA: AMR/AMR-WB
Echo cancellation and noise suppression
PCM Interface
Used for audio function with external codec.
Support 8-bit A-law, μ-law and 16-bit linear data formats.
Support long frame sync and short frame sync.
Support master and slave mode, but must be the master in long frame
sync.
UART Interface
Support two UART interfaces: main UART interface and debug UART
interface.
Main UART interface:
Seven lines on main UART interface
Support RTS and CTS hardware flow control
Baud rate can reach up to 921600bps, 115200bps by default
Used for AT command, data transmission or firmware upgrade
Support multiplexing function
Debug UART interface:
Two lines on debug UART interface: DBG_TXD and DBG_RXD
Can be used for GNSS NMEA sentences output
USB Interface
Compliant with USB 2.0 specification (slave only), the data transfer
rate can reach up to 480Mbps.
Used for AT command communication, data transmission, GNSS
NMEA output, software debug and firmware upgrade.
USB Driver: Windows XP, Windows Vista, Windows 7, Windows 8,
Windows CE5.0/6.0/7.0, Linux 2.6/3.0, Android 2.3/4.0/4.2.
Rx-diversity
Support UMTS Rx-diversity
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2). When the module works within this restricted temperature range, RF performance might degrade. For
example, the frequency error or the phase error would increase.
2.3. Functional Diagram
The following figure shows a block diagram of UC20 and illustrates the major functional parts.
Power management
Baseband
DDR+NAND flash
Radio frequency
Peripheral interface
--UART interface
--USIM card interface
--USB interface
--PCM interface
--ADC interface
--Status indication
--Control interface
GNSS Features
Gen8 of Qualcomm GNSS engine (GPS and GLONASS)
Protocol: NMEA 0183
AT Commands
Compliant with 3GPP TS 27.007, 27.005 and Quectel enhanced AT
commands.
Real Time Clock
Implemented
Network Indication
Two pins including NET_MODE and NET_STATUS to indicate
network connectivity status.
Antenna Interface
Include main GSM/UMTS antenna, UMTS diversity antenna and
GNSS antenna.
Physical Characteristics
Size: 32.0±0.15 × 29.0±0.15 × 2.5±0.2mm
Weight: approx. 4.9g
Temperature Range
Normal operation: -35°C ~ +75°C
Restricted operation: -40°C ~ -35°C and +75°C ~ +85°C 2)
Storage temperature: -45°C ~ +90°C
Firmware Upgrade
USB interface (by default) or main UART interface.
RoHS
All hardware components are fully compliant with EU RoHS directive.
NOTE
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PWRKEY
RESET_N
32kHz
19.2MHz
Power
Management Unit
Baseband
RF Transceiver
GNSS Receiver
ANT_GNSS RF
Switch
DDR RAM/
ANT_MAIN
USIM
Status
ADC
PCM
UART
VBAT_BB
USB
ANT_DIV
VBAT_RF
VDD_EXT
GSM UMTS
RF
Switch
VDD_2V85
WAKEUP_IN
VRTC
SLEEP_IND
W_DISABLE#
NAND Flash
Figure 1: Functional Diagram
2.4. Evaluation Board
In order to help you to develop applications with UC20, Quectel supplies an evaluation board (EVB),
RS-232 to USB cable, USB data cable, power adapter, earphone, antenna and other peripherals to
control or test the module. For details, please refer to document [2].
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3 Application Interface
3.1. General Description
UC20 is equipped with a 72-pin 1.3mm pitch SMT pads plus 40-pin other pads that connect to cellular
application platform. Sub-interfaces included in these pads are described in detail in the following
chapters:
Power supply
UART interface
USIM interface
USB interface
PCM interface
ADC interface
Status indication
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3.2. Pin Assignment
The following figure shows the pin assignment of the UC20 module.
35
36
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
1
3
4
5
6
7
2
WAKEUP_IN
AP_READY
SLEEP_IND
W_DISABLE#
NET_MODE
NET_STATUS
VDD_EXT
GND
GND
DBG_RXD
DBG_TXD
USIM_PRESENCE
USIM_VDD
USIM_DATA
USIM_CLK
USIM_RST
VRTC
8
9
10
11
12
13
14
15
16
17
18
19
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
USIM_GND
GND
RESET_N
PWRKEY
AGND
RESERVED
PCM_IN*
PCM_OUT*
PCM_SYNC*
PCM_CLK*
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
VDD_2V85
ANT_DIV
GND
GND
USB_VBUS
USB_DM
USB_DP
RXD
TXD
DTR
RTS
CTS
DCD
RI
STATUS
VBAT_BB
VBAT_BB
VBAT_RF
VBAT_RF
GND
RESERVED
GND
GND
ANT_MAIN
GND
ANT_GNSS
GND
ADC1
RESERVED
I2C_SDA
I2C_SCL
RESERVED
RESERVED
RESERVED
RESERVED
ADC0
GND
GND
GND
73
74
75
76
77
78
79
80
81
82
83
84
100
101
102
106
107
111
112
103
104
109
105
110
89
94
98
88
93
97
86
91
96
85
90
95
99
87
92
Power USB UART USIM PCM* ANT GND RESERVED OTHERS
108
Figure 2: Pin Assignment (Top View)
1. Keep all RESERVED pins and unused pins unconnected.
2. GND pads 85~112 should be connected to ground in the design, and RESERVED pads 73~84
should not be designed in schematic and PCB decal.
3. “*” means PCM function is only supported in Telematics version.
NOTES
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3.3. Pin Description
The following tables show the UC20’s pin definition.
Table 3: IO Parameters Definition
Type
Description
IO
Bidirectional input/output
DI
Digital input
DO
Digital output
PI
Power input
PO
Power output
AI
Analog input
AO
Analog output
OD
Open drain
Table 4: Pin Description
Power Supply
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
VBAT_BB
59,60
PI
Power supply for
module baseband
part.
Vmax = 4.3V
Vmin = 3.3V
Vnorm = 3.8V
It must be able to
provide sufficient
current up to 0.8A.
VBAT_RF
57,58
PI
Power supply for
module RF part.
Vmax = 4.3V
Vmin = 3.3V
Vnorm = 3.8V
It must be able to
provide sufficient
current in a transmitting
burst which typically
rises to 2.0A.
VRTC
18
IO
Power supply for
internal RTC circuit.
VOmax = 3.25V
when VBAT ≥ 3.3V.
VI = 1.5V~3.25V at
IIN = 3uA when
VBAT is not applied.
If unused, keep it open.
VDD_EXT
7
PO
Provide 1.8V for
Vnorm = 1.8V
Power supply for
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external circuit.
IOmax = 20mA
external GPIO’s pull up
circuits.
VDD_2V85
34
PO
Provide 2.85V for
external circuit.
Vnorm = 2.85V
IOmax = 100mA
Reserved for future
application. If unused,
keep it open.
GND
8,9,19,36,
46,48,50~
54,56,72,
85~112
Ground.
Turn On/Off
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
PWRKEY
21
DI
Turn on/off the
module.
RPU ≈ 200kΩ
VIHmax = 2.1V
VIHmin = 1.3V
VILmax = 500mV
Pull-up to 1.8V
internally.
RESET_N
20
DI
Reset the module.
RPU ≈ 200kΩ
VIHmax = 2.1V
VIHmin = 1.3V
VILmax = 500mV
Pull-up to 1.8V
internally. Active low.
If unused, keep it
open.
Status Indication
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
STATUS
61
OD
Indicate the module
operating status.
Require external
pull-up. If unused,
keep it open.
NET_MODE
5
DO
Indicate the module
network registration
mode.
VOHmin = 1.35V
VOLmax = 0.45V
1.8V power domain.
If unused, keep it
open.
NET_
STATUS
6
DO
Indicate the module
network activity
status.
VOHmin = 1.35V
VOLmax = 0.45V
1.8V power domain.
If unused, keep it
open.
SLEEP_IND
3
DO
Indicate the sleep
status.
VOHmin = 1.35V
VOLmax = 0.45V
1.8V power domain.
If unused, keep it
open.
USB Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
USB_VBUS
71
PI
USB detection.
Vmax = 5.25V
Vmin = 3.0V
Vnorm = 5.0V
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USB_DP
69
IO
USB differential data
bus.
Compliant with USB
2.0 standard
specification.
Require differential
impedance of 90Ω.
USB_DM
70
IO
USB differential data
bus.
Compliant with USB
2.0 standard
specification.
Require differential
impedance of 90Ω.
USIM Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
USIM_GND
10
Specified ground for
USIM card.
USIM_VDD
14
PO
Power supply for
USIM card.
For 1.8V USIM:
Vmax = 1.9V
Vmin = 1.7V
For 3.0V USIM:
Vmax = 3.05V
Vmin = 2.7V
IOmax = 50mA
Either 1.8V or 3V is
supported by the
module automatically.
USIM_DATA
15
IO
Data signal of USIM
card.
For 1.8V USIM:
VILmax = 0.6V
VIHmin = 1.2V
VOLmax = 0.45V
VOHmin = 1.35V
For 3.0V USIM:
VILmax = 1.0V
VIHmin = 1.95V
VOLmax = 0.45V
VOHmin = 2.55V
Pull-up to USIM_VDD
with 15k resistor
internally.
USIM_CLK
16
DO
Clock signal of USIM
card.
For 1.8V USIM:
VOLmax = 0.45V
VOHmin = 1.35V
For 3.0V USIM:
VOLmax = 0.45V
VOHmin = 2.55V
USIM_RST
17
DO
Reset signal of
USIM card.
For 1.8V USIM:
VOLmax = 0.45V
VOHmin = 1.35V
For 3.0V USIM:
VOLmax = 0.45V
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VOHmin = 2.55V
USIM_PRE
SENCE
13
DI
USIM card insertion
detection.
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
1.8V power domain.
If unused, keep it
open.
ADC Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
ADC0
45
AI
General purpose
analog to digital
converter.
Voltage range:
0.2V to 2.1V
If unused, keep it
open.
ADC1
44
AI
General purpose
analog to digital
converter.
Voltage range:
0.2V to 4.2V
If unused, keep it
open.
Main UART Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
RI
62
DO
Ring indicator.
VOLmax = 0.45V
VOHmin = 1.35V
1.8V power domain.
If unused, keep it
open.
DCD
63
DO
Data carrier
detection.
VOLmax = 0.45V
VOHmin = 1.35V
1.8V power domain.
If unused, keep it
open.
CTS
64
DO
Clear to send.
VOLmax = 0.45V
VOHmin = 1.35V
1.8V power domain.
If unused, keep it
open.
RTS
65
DI
Request to send.
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
1.8V power domain.
If unused, keep it
open.
DTR
66
DI
Data terminal ready,
sleep mode control.
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
1.8V power domain.
Pull-up by default.
Low level wakes up
the module. If
unused, keep it open.
TXD
67
DO
Transmit data.
VOLmax = 0.45V
VOHmin = 1.35V
1.8V power domain.
If unused, keep it
open.
RXD
68
DI
Receive data.
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
1.8V power domain.
If unused, keep it
open.
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VIHmax = 2.0V
Debug UART Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
DBG_TXD
12
DO
Transmit data.
VOLmax = 0.45V
VOHmin = 1.35V
1.8V power domain.
If unused, keep it
open.
DBG_RXD
11
DI
Receive data.
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
1.8V power domain.
If unused, keep it
open.
RF Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
ANT_DIV
35
AI
Diversity antenna.
50Ω impedance
If unused, keep it
open.
ANT_MAIN
49
IO
Main antenna.
50Ω impedance
ANT_GNSS
47
AI
GNSS antenna.
50Ω impedance
If unused, keep it
open.
PCM Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
PCM_IN
24
DI
PCM data input.
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
1.8V power domain.
If unused, keep it
open.
PCM_OUT
25
DO
PCM data output.
VOLmax = 0.45V
VOHmin = 1.35V
1.8V power domain.
If unused, keep it
open.
PCM_SYNC
26
IO
PCM data frame
sync signal.
VOLmax = 0.45V
VOHmin = 1.35V
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
1.8V power domain.
In master mode, it is
an output signal. In
slave mode, it is an
input signal. If
unused, keep it open.
PCM_CLK
27
IO
PCM data bit clock.
VOLmax = 0.45V
VOHmin = 1.35V
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
1.8V power domain.
In master mode, it’s
an output signal. In
slave mode, it is an
input signal. If
unused, keep it open.
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AGND
22
Reserved for analog
ground.
Ground.
If unused, connect
this pin to ground.
I2C Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
I2C_SCL
41
OD
I2C serial clock.
External pull-up
resistor is required.
1.8V only. If unused,
keep it open.
I2C_SDA
42
OD
I2C serial data.
External pull-up
resistor is required.
1.8V only. If unused,
keep it open.
Other Pins
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
WAKEUP_IN
1
DI
Sleep mode control.
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
1.8V power domain.
Pull-up by default.
Low level wakes up
the module. If
unused, keep it open.
W_DISABLE#
4
DI
Airplane mode
control.
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
1.8V power domain.
Pull-up by default.
In low level voltage,
module can enter into
airplane mode. If
unused, keep it open.
AP_READY
2
DI
Application
processor sleep
state detection.
VILmin = -0.3V
VILmax = 0.6V
VIHmin = 1.2V
VIHmax = 2.0V
1.8V power domain.
If unused, keep it
open.
RESERVED Pins
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
RESERVED
23,28~33
,37~40,
43,55,73
~84
Reserved
Keep these pins
unconnected.
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3.4. Operating Modes
The table below briefly summarizes the various operating modes referred to in the following chapters.
Table 5: Overview of Operating Modes
Mode
Details
Normal Operation
GSM Idle
Software is active. The module has registered to the GSM network
and is ready to send and receive data.
GSM Talk/Data
GSM connection is ongoing. In this mode, the power consumption
is decided by the configuration of power control level (PCL),
dynamic DTX control and the working RF band.
GPRS Idle
The module is ready for GPRS data transfer, but no data transfer
is going on. In this case, power consumption depends on network
setting and GPRS configuration.
GPRS Data
There is GPRS data in transfer (PPP, TCP or UDP). In this mode,
power consumption is decided by the PCL, working RF band and
GPRS multi-slot configuration.
EDGE Idle
The module is ready for data transfer in EDGE mode, but no data
is currently sent or received. In this case, power consumption
depends on network settings and EDGE configuration.
EDGE Data
There is EDGE data in transfer (PPP, TCP or UDP). In this mode,
power consumption is decided by the PCL, working RF band and
EDGE multi-slot configuration.
UMTS Idle
Software is active. The module has registered to the UMTS
network and the module is ready to send and receive data.
UMTS
Talk/Data
UMTS connection is ongoing. In this mode, the power
consumption is decided by network setting (e.g. TPC pattern) and
data transfer rate.
HSPA Idle
Software is active. The module has registered to the HSPA
network and the module is ready to send and receive data.
HSPA Data
HSPA data transfer is ongoing. In this mode, the power
consumption is decided by network setting (e.g. TPC pattern) and
data transfer rate.
Minimum
Functionality
Mode
AT+CFUN command can set the module entering into a minimum functionality mode
without removing the power supply. In this case, both RF function and USIM card will
be invalid.
Airplane Mode
AT+CFUN command and W_DISABLE# pin can set the module entering into
airplane mode. In this case, RF function will be invalid.
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Sleep Mode
In this mode, the current consumption of the module will be reduced to the minimal
level. During this mode, the module can still receive paging message, SMS, voice
call and TCP/UDP data from the network normally.
Power Down
Mode
In this mode, the power management unit shuts down the power supply. Only the
power supply for RTC remains. Software is not active. The serial interface is not
accessible. Operating voltage (connected to VBAT_RF and VBAT_BB) remains
applied.
3.5. Power Saving
3.5.1. Sleep Mode
UC20 is able to reduce its current consumption to a minimum value during the sleep mode. The following
section describes UC20’s power saving procedure.
3.5.1.1. UART Application
If application processor communicates with module via UART interface, the following preconditions can
let the module enter into the sleep mode.
Execute AT command AT+QSCLK=1 to enable the sleep mode.
Drive DTR to high level.
The following figure shows the connection between the module and application processor.
RXD
TXD
RI
DTR
AP_READY
TXD
RXD
EINT
GPIO
GPIO
Module Processor
GND GND
Figure 3: UART Sleep Application
The RI of module is used to wake up the processor, and AP_READY will detect the sleep state of
processor (can be configured to high level or low level detection). You should pay attention to the level
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match shown in dotted line between module and processor.
Driving DTR to low level will wake up the module.
3.5.1.2. USB Application with Suspend Function
If application processor communicates with module via USB interface, and processor supports USB
suspend function, the following preconditions can let the module enter into the sleep mode.
Execute AT command AT+QSCLK=1 to enable the sleep mode.
The processor’s USB bus which is connected with the module USB interface enters into suspended
state.
The following figure shows the connection between the module and processor.
USB_VBUS
USB_DP
USB_DM
AP_READY
VDD
USB_DP
USB_DM
GPIO
Module Processor
GND GND
RI EINT
Figure 4: USB Application with Suspend Function
When the processor’s USB bus returns to resume state, the module will be woken up.
3.5.1.3. USB Application without Suspend Function
If application processor communicates with module via USB interface, and processor does not support
USB suspend function, you should disconnect USB_VBUS with additional control circuit to let the module
enter into sleep mode.
Execute AT command AT+QSCLK=1 to enable the sleep mode.
Disconnect USB_VBUS.
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The following figure shows the connection between the module and application processor.
USB_VBUS
USB_DP
USB_DM
AP_READY
VDD
USB_DP
USB_DM
GPIO
Module Processor
RI EINT
Power
Switch
GPIO
GND GND
Figure 5: USB Sleep Application without Suspend Function
Supply power to USB_VBUS will wake up the module.
In sleep mode, module can still receive paging, SMS, voice call and TCP/UDP data from network, but the
UART port is not accessible. When the module enters into the sleep mode, the SLEEP_IND will output a
high logic level.
For more details about power saving mode, please refer to document [8].
3.5.2. Airplane Mode
When module enters into the airplane mode, the RF function does not work, and all AT commands
correlative with RF function will be not accessible. This mode can be set with the following way.
Hardware:
The W_DISABLE# pin is pulled up by default, drive it to low level will let the module enter into airplane
mode.
Software:
Command AT+CFUN provides the choice of the functionality level <fun>=0, 1, 4.
AT+CFUN=0: Minimum functionality mode, both USIM and RF function are disabled.
AT+CFUN=1: Full functionality mode (by default).
AT+CFUN=4: Airplane mode. RF function is disabled.
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1. The W_DISABLE# control function is disabled in firmware by default. It can be enabled by AT
command AT+QCFG=“airplanecontrol”. Refer to document [1].
2. When the module is in sleep mode, the W_DISABLE# control is invalid. Please be sure to wake the
module up first.
3. GNSS function is still available when RF function is disabled.
3.6. Power Supply
3.6.1. Power Supply Pins
UC20 provides four VBAT pins dedicated to connect with the external power supply. There are two
separate voltage domains for VBAT.
VBAT_RF with two pads for module RF part.
VBAT_BB with two pads for module baseband part.
The following table shows the VBAT pins and ground pins.
Table 6: VBAT and GND Pins
Pin Name
Pin No.
Description
Min.
Typ.
Max.
Unit
VBAT_RF
57,58
Power supply for module RF
part.
3.3
3.8
4.3
V
VBAT_BB
59,60
Power supply for module
baseband part.
3.3
3.8
4.3
V
GND
8,9,19,36,46,
48,50~54,56,
72, 85~112
Ground.
-
0
-
V
3.6.2. Decrease Voltage Drop
The power supply range of the module is 3.3V ~ 4.3V. Make sure the input voltage will never drop below
3.3V. If the voltage drops below 3.3V, the module will turn off automatically. The following figure shows the
voltage drop during transmitting burst in 2G network, the voltage drop will be less in 3G network.
NOTES
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< 400mV
Current
VBAT
≤ 2.0A
burst burst
Min. 3.3V
Figure 6: Voltage Drop during Transmitting Burst
To decrease voltage drop, a bypass capacitor of about 100µF with low ESR should be used. Multi-layer
ceramic chip (MLCC) capacitor can provide the best combination of low ESR. The main power supply
from an external application has to be a single voltage source and expanded to two sub paths with star
structure. The width of VBAT_BB trace should be no less than 1mm, and the width of VBAT_RF trace
should be no less than 2mm, and the principle of the VBAT trace is the longer, the wider.
Three ceramic capacitors (100nF, 33pF, 10pF) are recommended to be applied to the VBAT pins. The
capacitors should be placed close to the UC20’s VBAT pins. In addition, in order to get a stable power
source, it is suggested to use a zener diode of which reverse zener voltage is 5.1V and dissipation power
is more than 0.5W. The following figure shows star structure of the power supply.
Module
VBAT_RF
VBAT_BB
VBAT
C1
100uF
C6
100nF
C7
33pF
C8
10pF
+
+C2
100nF
C5
100uF
C3
33pF
C4
10pF
D1
5.1V
Figure 7: Star Structure of the Power Supply
3.6.3. Reference Design for Power Supply
The power design for the module is very important, since the performance of power supply for the module
largely depends on the power source. The power supply is capable of providing the sufficient current up to
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2A at least. If the voltage drop between the input and output is not too high, it is suggested to use a LDO
to supply power for module. If there is a big voltage difference between the input source and the desired
output (VBAT), a buck converter is preferred to be used as a power supply.
The following figure shows a reference design for +5V input power source. The designed output for the
power supply is about 3.8V and the maximum load current is 3A.
DC_IN
C1 C2
MIC29302WU U1
IN OUT
EN
GND
ADJ
2 4
1
3
5
VBAT
100nF
C3
470uF
C4
100nF
R2
100K
47K
R3
470uF 470R
51K R4
R1
1%
1%
Figure 8: Reference Circuit of Power Supply
3.6.4. Monitor the Power Supply
You can use the AT+CBC command to monitor the VBAT_BB voltage value. For more details, please
refer to document [1].
3.7. Turn on and off Scenarios
3.7.1. Turn on Module Using the PWRKEY
The following table shows the pin definition of PWRKEY.
Table 7: PWRKEY Pin Description
Pin Name
Pin No.
Description
DC Characteristics
Comment
PWRKEY
21
Turn on/off the module.
VIHmax = 2.1V
VIHmin = 1.3V
VILmax = 500mV
Pull-up to 1.8V internally
with 200kΩ resistor.
When UC20 is in power down mode, it can be turned on to normal mode by driving the PWRKEY pin to a
low level at least 100ms. It is recommended to use an open drain/collector driver to control the PWRKEY.
After STATUS pin (require external pull-up) outputting a low level, PWRKEY pin can be released. A simple
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reference circuit is illustrated in the following figure.
Turn on pulse
PWRKEY
4.7K
47K
≥ 100ms
Figure 9: Turn on the Module Using Driving Circuit
The other way to control the PWRKEY is using a button directly. A TVS component is indispensable to be
placed nearby the button for ESD protection. When pressing the key, electrostatic strike may generate
from finger. A reference circuit is showed in the following figure.
PWRKEY
S1
Close to S1
TVS
Figure 10: Turn on the Module Using Keystroke
The turn on scenarios is illustrated as the following figure.
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VIL ≤ 0.5V
VIH ≥ 1.3V
VBAT
PWRKEY
≥ 100ms
1
RESET_N
STATUS
(OD)
1.3 ~ 1.9s
Inactive
UART Active
≥ 5s
Inactive Active
USB
≥ 5s
Figure 11: Timing of Turning on Module
Make sure that VBAT is stable before pulling down PWRKEY pin. The time between them is
recommended to be 30ms.
3.7.2. Turn off Module
The following procedures can be used to turn off the module:
Normal power down procedure: Turn off the module using the PWRKEY pin.
Normal power down procedure: Turn off the module using command AT+QPOWD.
Automatic shutdown: Turn off the module automatically if under-voltage or over-voltage is detected.
3.7.2.1. Turn off Module Using the PWRKEY Pin
Driving the PWRKEY to a low level voltage at least 0.6s, the module will execute power-down procedure
after PWRKEY is released. The power-down scenario is illustrated as the following figure.
NOTE
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VBAT
PWRKEY
Log off network about 1s to 60s
≥ 0.6s
RUNNING Power-down procedure OFF
Module
Status
STATUS
(OD)
Figure 12: Timing of Turning off Module
During power-down procedure, module will send out URC “NORMAL POWER DOWN” via URC port first,
then log off network and save important data. After logging off, module sends out “POWERED DOWN”
and shut down the internal power supply. The power on VBAT pins is not allowed to turn off before the
URC “POWERED DOWN” is output to avoid data loss. If logging off is not done within 60s, module will
shut down internal power supply forcibly.
After that moment, the module enters the power down mode, no other AT commands can be executed
and only the RTC is still active.
3.7.2.2. Turn off Module Using AT Command
It is also a safe way to use AT command AT+QPOWD to turn off the module, which is similar to turning off
the module via PWRKEY Pin.
Please refer to document [1] for details about the AT command of AT+QPOWD.
3.7.2.3. Automatic Shutdown
The module will constantly monitor the voltage applied on the VBAT, if the voltage ≤ 3.5V, the following
URC will be presented:
+QIND: “vbatt”,-1
If the voltage ≥ 4.21V, the following URC will be presented:
+QIND: “vbatt”,1
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The uncritical voltage is 3.3V to 4.35V, If the voltage > 4.35V or < 3.3V the module would automatically
shut down itself.
If the voltage < 3.3V, the following URC will be presented:
+QIND: “vbatt”,-2
If the voltage > 4.35V, the following URC will be presented:
+QIND: “vbatt”,2
The value of voltage threshold can be revised by command AT+QCFG=“vbatt”, refer to document [1]
for details.
3.8. Reset the Module
The RESET_N can be used to reset the module.
Table 8: RESET_N Pin Description
Pin Name
Pin No.
Description
DC Characteristics
Comment
RESET_N
20
Reset the module.
VIHmax = 2.1V
VIHmin = 1.3V
VILmax = 500mV
Pull-up to 1.8V internally
with 200kΩ resistor.
Active low.
You can reset the module by driving the RESET_N to a low level voltage for more than 150ms and then
releasing.
The recommended circuit is similar to the PWRKEY control circuit. You can use open drain/collector
driver or button to control the RESET_N.
NOTE
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Reset pulse
RESET_N
4.7K
47K
≥ 150ms
Figure 13: Reference Circuit of RESET_N by Using Driving Circuit
RESET_N
S2
Close to S2
TVS
Figure 14: Reference Circuit of RESET_N by Using Button
The reset scenario is illustrated as the following figure.
VIL ≤ 0.5V VIH ≥ 1.3V
VBAT
150ms
RESETTING
Module
Status RUNNING
RESET_N
RUNNING
≥ 5s
Figure 15: Timing of Resetting Module
Use the RESET_N only when turning off the module by the command AT+QPOWD and the PWRKEY pin
failed.
NOTE
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3.9. RTC Backup
The RTC (Real Time Clock) can be powered by an external power source through the pin VRTC when the
module is powered down and there is no power supply for the VBAT. It is also available to charge the
battery on the VRTC when module is turned on. You can choose rechargeable battery, capacitor or
non-rechargeable battery depending on different applications.
The following figures show the various sample circuits for VRTC backup.
Module
RTC
Core
R
VRTC
Non-chargeable
Battery
Figure 16: RTC Supply from Non-chargeable Battery
Rechargeable
Battery
Module
RTC
Core
R
VRTC
Figure 17: RTC Supply from Rechargeable Battery
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Large
Capacitance
Capacitor Module
RTC
Core
R
VRTC
Figure 18: RTC Supply from Capacitor
3.10. UART Interface
The module provides two UART interfaces: main UART interface and debug UART interface. The
following shows the different features.
Main UART interface supports 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600bps
baud rate, the default is 115200bps. This interface can be used for data transmission, AT
communication or firmware upgrade.
Debug UART interface supports 115200bps. It can be used for GNSS NMEA sentences output.
USB interface supports software debug and firmware upgrade by default.
The module is designed as the DCE (Data Communication Equipment), following the traditional
DCE-DTE (Data Terminal Equipment) connection. The following tables show the pin definition of these
two UART interfaces.
Table 9: Pin Definition of the Main UART Interface
Pin Name
Pin No.
I/O
Description
Comment
RI
62
DO
Ring indicator.
1.8V power domain.
DCD
63
DO
Data carrier detection.
1.8V power domain.
CTS
64
DO
Clear to send.
1.8V power domain.
NOTE
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RTS
65
DI
Request to send.
1.8V power domain.
DTR
66
DI
Data terminal ready.
1.8V power domain.
TXD
67
DO
Transmit data.
1.8V power domain.
RXD
68
DI
Receive data.
1.8V power domain.
Table 10: Pin Definition of the Debug UART Interface
Pin Name
Pin No.
I/O
Description
Comment
DBG_TXD
12
DO
Transmit data.
1.8V power domain.
DBG_RXD
11
DI
Receive data.
1.8V power domain.
The logic levels are described in the following table.
Table 11: Logic Levels of Digital I/O
Parameter
Min
Max
Unit
VIL
-0.3
0.6
V
VIH
1.2
2.0
V
VOL
0
0.45
V
VOH
1.35
1.8
V
UC20 provides 1.8V UART interface. A level translator should be used if your application is equipped with
a 3.3V UART interface. A level translator TXS0108PWR provided by Texas Instrument is recommended.
The following figure shows the reference design.
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VCCA VCCB
OE
A1
A2
A3
A4
A5
A6
A7
A8
GND
B1
B2
B3
B4
B5
B6
B7
B8
VDD_EXT
RI
DCD
RTS
RXD
DTR
CTS
TXD
51K 51K
0.1uF 0.1uF
RI_3.3V
DCD_3.3V
RTS_3.3V
RXD_3.3V
DTR_3.3V
CTS_3.3V
TXD_3.3V
VDD_3.3V
Translator
Figure 19: Reference Circuit with Translator Chip
Please visit http://www.ti.com for more information.
Another example with transistor translation circuit is shown as below. The construction of dotted line can
refer to the construction of solid line. Please pay attention to direction of connection. Input dotted line of
module should refer to input solid line of the module. Output dotted line of module should refer to output
solid line of the module.
MCU/ARM
/TXD
/RXD
VDD_EXT
4.7K
VCC_MCU 4.7K
4.7K
VDD_EXT
TXD
RXD
RTS
CTS
DTR
RI
/RTS
/CTS
GND
GPIO DCD
Module
GPIO
EINT
VDD_EXT 4.7K
GND
1nF
1nF
Figure 20: Reference Circuit with Transistor Circuit
The following figure is an example of connection between UC20 and PC. A voltage level translator and a
RS-232 level translator chip must be inserted between module and PC, since these two UART interfaces
do not support the RS-232 level, while support the 1.8V CMOS level only.
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TXS0108PWR
DCD_3.3V
RTS_3.3V
DTR_3.3V
RXD_3.3V
RI_3.3V
CTS_3.3V
TXD_3.3V
DCD
RTS
DTR
RXD
RI
CTS
TXD DCD_1.8V
RTS_1.8V
DTR_1.8V
RXD_1.8V
RI_1.8V
CTS_1.8V
TXD_1.8V
VCCA
Module
GND GND
VDD_EXT VCCB
3.3V
DIN1
ROUT3
ROUT2
ROUT1
DIN4
DIN3
DIN2
DIN5
R1OUTB
FORCEON
/FORCEOFF /INVALID
3.3V
DOUT1
DOUT2
DOUT3
DOUT4
DOUT5
RIN3
RIN2
RIN1
VCC GND
OE
SN65C3238 DB-9
Connect to PC
DCD
RTS
DTR
TXD
RI
CTS
RXD
DSR
GND
1
2
3
4
5
6
7
8
9
Figure 21: RS232 Level Match Circuit
1. The module disables the hardware flow control by default. When hardware flow control is required,
RTS and CTS should be connected to the host. AT command AT+IFC=2,2 is used to enable
hardware flow control. AT command AT+IFC=0,0 is used to disable the hardware flow control. For
more details, please refer to document [1].
2. Rising edge on DTR will let the module exit from the data mode by default. It can be disabled by AT
commands. Refer to document [1] about the command AT&D and AT&V for details.
3. DCD is used as data mode indication. Refer to document [1] about the command AT&C and AT&V
for details.
3.11. USIM Card Interface
The USIM card interface circuitry meets ETSI and IMT-2000 SIM interface requirements. Both 1.8V and
3.0V USIM cards are supported.
Table 12: Pin Definition of the USIM Interface
Pin Name
Pin No.
I/O
Description
Comment
USIM_VDD
14
PO
Power supply for USIM card.
Either 1.8V or 3.0V is supported
by the module automatically.
USIM_DATA
15
IO
Data signal of USIM card.
Pull-up to USIM_VDD with 15k
resistor internally.
NOTES
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USIM_CLK
16
DO
Clock signal of USIM card.
USIM_RST
17
DO
Reset signal of USIM card.
USIM_PRES
ENCE
13
DI
USIM card insertion detection.
1.8V power domain.
USIM_GND
10
Specified ground for USIM card.
The following figure shows the reference design of the 8-pin USIM card.
Module
USIM_VDD
USIM_GND
USIM_RST
USIM_CLK
USIM_DATA
USIM_PRESENCE
22R
22R
22R
VDD_EXT
51K 100nF USIM Connector
GND
GND
33pF 33pF 33pF
VCC
RST
CLK IO
VPP
GND
GND
USIM_VDD
15K
Figure 22: Reference Circuit of the 8 Pin USIM Card
Some AT commands are invalid when USIM card is not applied.
UC20 supports USIM card hot-plugging via the USIM_PRESENCE pin. For details, refer to document [1]
about the command AT+QSIMDET. If you do not need the USIM card detection function, keep
USIM_PRESENCE unconnected. The reference circuit for using a 6-pin USIM card connector is
illustrated as the following figure.
NOTE
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Module
USIM_VDD
USIM_GND
USIM_RST
USIM_CLK
USIM_DATA 22R
22R
22R
100nF USIM Connector
GND
33pF 33pF 33pF
VCC
RST
CLK IO
VPP
GND
GND
15K
USIM_VDD
Figure 23: Reference Circuit of the 6 Pin USIM Card
In order to enhance the reliability and availability of the USIM card in your application, please follow the
following criterion in the USIM circuit design:
Keep layout of USIM card as close as possible to the module. Assure the length of the trace is less
than 200mm.
Keep USIM card signal away from RF and VBAT alignment.
Assure the ground between module and USIM connector short and wide. Keep the width of ground
and USIM_VDD no less than 0.5mm to maintain the same electric potential. The decouple capacitor
of USIM_VDD should be less than 1uF and must be near to USIM connector.
To avoid cross-talk between USIM_DATA and USIM_CLK, keep them away with each other and
shield them with surrounded ground.
In order to offer good ESD protection, it is recommended to add TVS. The 22Ω resistors should be
added in series between the module and the USIM card so as to suppress the EMI spurious
transmission and enhance the ESD protection. The 33pF capacitors are used for filtering interference
of EGSM900. Please note that the USIM peripheral circuit should be close to the USIM connector.
The pull-up resistor on USIM_DATA line can improve anti-jamming capability when long layout trace
and sensitive occasion is applied, and should be placed close to the USIM connector.
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3.12. USB Interface
UC20 contains one integrated Universal Serial Bus (USB) transceiver which complies with the USB 2.0
specification and supports high speed (480 Mbps), full speed (12 Mbps) and low speed (1.5 Mbps) mode.
The USB interface is primarily used for AT command, data transmission, GNSS NMEA sentences output,
software debug and firmware upgrade. The following table shows the pin definition of USB interface.
Table 13: USB Pin Description
Pin Name
Pin No.
I/O
Description
Comment
USB_DP
69
IO
USB differential data bus (positive).
Require differential
impedance of 90Ω.
USB_DM
70
IO
USB differential data bus (minus).
Require differential
impedance of 90Ω.
USB_VBUS
71
PI
Used for detecting the USB interface
connected.
3.0~5.25V.
Typical 5.0V.
GND
72
Ground.
More details about the USB 2.0 specifications, please visit http://www.usb.org/home.
The following figure shows the reference circuit of USB interface.
Module
USB_VBUS
USB_DP
USB_DM
GND
USB connector
Close to USB connector
Differential layout
USB_VBUS
USB_DP
USB_DM
GND
ESD Array
NM_2pF
Figure 24: Reference Circuit of USB Application
In order to ensure the USB interface design corresponding with the USB 2.0 specification, please comply
with the following principles.
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It is important to route the USB signal traces as differential pairs with total grounding. The impedance
of USB differential trace is 90ohm.
Do not route signal traces under crystals, oscillators, magnetic devices and RF signal traces. It is
important to route the USB differential traces in inner-layer with ground shielding not only upper and
lower layer but also right and left side.
Pay attention to the influence of junction capacitance of ESD component on USB data lines. Typically,
the capacitance value should be less than 2pF.
Keep the ESD components as closer to the USB connector as possible.
UC20 module can only be used as a slave device.
The USB interface is recommended to be reserved for firmware upgrade in your design. The following
figure shows the recommended test points.
Module
USB_DM
USB_DP
VBAT_BB
USB_VBUS
PWRKEY
GND
VBAT_RF
USB_DM
USB_DP
VBAT
USB_VBUS
PWRKEY
GND
Connector
Figure 25: Test Points of Firmware Upgrade
3.13. PCM and I2C Interface
UC20 provides one Pulse Code Modulation (PCM) digital interface for audio design, which supports the
following modes:
Primary mode (short sync, works as both master and slave)
Auxiliary mode (long sync, works as master only)
NOTE
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In primary mode, the data is sampled on the falling edge of the PCM_CLK and transmitted on the rising
edge; the PCM_SYNC falling edge represents the MSB. In this mode, PCM_CLK supports 128, 256, 512,
1024, 2048 and 4096kHz for different speech codec.
In auxiliary mode, the data is sampled on the falling edge of the PCM_CLK and transmitted on the rising
edge; while the PCM_SYNC rising edge represents the MSB. In this mode, PCM interface operates with a
128kHz PCM_CLK and an 8kHz, 50% duty cycle PCM_SYNC only.
UC20 supports 8-bit A-law and μ-law, and also 16-bit linear data formats. The following figures show the
primary mode’s timing relationship with 8kHz PCM_SYNC and 2048kHz PCM_CLK and auxiliary mode’s
timing relationship with 8kHz PCM_SYNC and 128kHz PCM_CLK.
PCM_CLK
PCM_SYNC
PCM_OUT
MSB LSB MSB
MSB LSB MSB
PCM_IN
125us
1 2 256255
Figure 26: Primary Mode Timing
PCM_CLK
PCM_SYNC
PCM_OUT
MSB LSB
PCM_IN
125us
MSB
1 2 1615
LSB
Figure 27: Auxiliary Mode Timing
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The following table shows the pin definition of PCM and I2C interface which can be applied on audio
codec design.
Table 14: Pin Definition of PCM and I2C Interface
Pin Name
Pin No.
I/O
Description
Comment
PCM_IN
24
DI
PCM data input.
1.8V power domain.
PCM_OUT
25
DO
PCM data output.
1.8V power domain.
PCM_SYNC
26
IO
PCM data frame sync signal.
1.8V power domain.
PCM_CLK
27
IO
PCM data bit clock.
1.8V power domain.
I2C_SCL
41
OD
I2C serial clock.
Require external pull-up
resistor. 1.8V only.
I2C_SDA
42
OD
I2C serial data.
Require external pull-up
resistor. 1.8V only.
Clock and mode can be configured by AT command, and the default configuration is master mode using
short sync data format with 2048kHz PCM_CLK and 8kHz PCM_SYNC. In addition, UC20’s firmware has
integrated the configuration on NAU8814 application with I2C interface. Refer to document [1] about the
command AT+QDAI for details.
The following figure shows the reference design of PCM interface with external codec IC.
PCM_IN
PCM_OUT
PCM_SYNC
PCM_CLK
I2C_SCL
I2C_SDA
NAU8814
Module
1.8V
4.7K
4.7K
BCLK
MCLK
FS
DACIN
ADCOUT
SCLK
SDIN
BIAS
MIC_BIAS
MIC+
MIC-
SPKOUT+
SPKOUT-
Figure 28: Reference Circuit of PCM Application with Audio Codec
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1. It is recommended to reserved RC (R=22Ω, C=22pF) circuit on the PCM lines, especially for
PCM_CLK.
2. UC20 works as a master device pertaining to I2C interface.
3.14. ADC Function
The module provides two analog-to-digital converters (ADC) to digitize the analog signal to 15-bit digital
data such as battery voltage, temperature and so on. Using AT command AT+QADC=0 can read the
voltage value on ADC0 pin. Using AT command AT+QADC=1 can read the voltage value on ADC1 pin.
For more details of these AT commands, please refer to document [1].
In order to improve the accuracy of ADC, the trace of ADC should be surrounded by ground.
Table 15: Pin Definition of the ADC
Pin Name
Pin No.
Description
ADC0
45
General purpose analog to digital converter.
ADC1
44
General purpose analog to digital converter.
The following table describes the characteristic of the ADC function.
Table 16: Characteristic of the ADC
Parameter
Min.
Typ.
Max.
Unit
ADC0 Voltage Range
0.2
2.1
V
ADC1 Voltage Range
0.2
4.2
V
ADC Resolution
15
bits
Offset Error
3.5
%
Gain Error
2.5
%
NOTES
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3.15. Network Status Indication
The network indication pins can be used to drive a network status indicator LED. The module provides
two pins which are NET_MODE and NET_STATUS. The following tables describe pin definition and logic
level changes in different network status.
Table 17: Pin Definition of Network Indicator
Pin Name
Pin No.
I/O
Description
Comment
NET_MODE
5
DO
Indicate the module network
registration mode.
1.8V power domain
NET_STATUS
6
DO
Indicate the module network activity
status.
1.8V power domain
Table 18: Working State of the Network Indicator
Pin Name
Status
Description
NET_MODE
Always High
Registered in 3G network
Always Low
Others
NET_STATUS
Flicker slowly (200ms High/1800ms Low)
Network searching
Flicker slowly (1800ms High/200ms Low)
Idle
Flicker quickly (125ms High/125ms Low)
Data transfer is ongoing
Always High
Voice calling
A reference circuit is shown in the following figure.
4.7K
47K
VBAT
2.2K
Module
Network
Indicator
Figure 29: Reference Circuit of the Network Indicator
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3.16. Operating Status Indication
3.16.1. STATUS
The STATUS pin is an open drain output for indicating the module operation status. You can connect it to
a GPIO of DTE with pulled up, or as LED indication circuit as below. When the module is turned on
normally, the STATUS will present the low state. Otherwise, the STATUS will present high-impedance
state.
Table 19: Pin Definition of STATUS
Pin Name
Pin No.
I/O
Description
Comment
STATUS
61
OD
Indicate the module operation status.
Require external pull-up.
The following figure shows different design circuit of STATUS, you can choose either one according to
your application demands.
VDD_MCU
10K
Module
STATUS MCU_GPIO
Module
STATUS
VBAT
2.2K
Figure 30: Reference Circuit of the STATUS
3.16.2. SLEEP_IND
The SLEEP_IND is an indicated pin for judging whether the module is in sleep mode or not. When the
module enters into the sleep mode, the SLEEP_IND will output a logic high level. So you can use the
SLEEP_IND for low current indication. The following table shows the pin definition of SLEEP_IND.
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Table 20: Pin Definition of SLEEP_IND
Pin Name
Pin No.
I/O
Description
Comment
SLEEP_IND
3
DO
Indicate the sleep status.
1.8V power domain.
Outputs high level when the
module is in sleep mode.
A reference circuit is shown in the following figure.
4.7K
47K
VBAT
2.2K
Module
SLEEP_IND
Figure 31: Reference Circuit of the SLEEP_IND
Module still periodically monitors the paging channel of the current base station (paging block reception)
during the sleep mode. When the module monitors the paging channel, it wakes up to active mode, to
enable the reception of paging block. In between, the module switches to sleep mode.
The following figure shows the paging timing cycle (T) during sleep mode.
SLEEP_IND
Paging
Sleep
T
Sleep Sleep
Paging
Sleep
Paging
T
Figure 32: Relationship between Sleep and Network Paging
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As to GSM network, the paging period time can be calculated with the following formula.
T= 4.615ms × 51 × DRX
As to WCDMA network, the paging period time can be calculated with the following formula.
T= 10ms × 2DRX
DRX (Discontinuous Reception) is a value from 2 to 9 in GSM network, resulting in paging intervals
470.6ms to 2118.42ms, and a value from 6 to 9 in WCDMA network, resulting in paging intervals from
640ms to 5120ms.
3.17. Behavior of the RI
You can use command AT+QCFG=“risignaltype”, “physical” to configure RI behavior:
No matter which port URC is presented on, URC will trigger the behavior on RI pin.
URC can be output from UART port, USB AT port and USB modem port by command AT+QURCCFG.
The default port is USB AT port.
In additional, RI behavior can be configured flexible. The default behavior of the RI is shown as below.
Table 21: Behavior of the RI
State
Response
Idle
RI keeps high level.
URC
RI outputs 120ms low pulse when new URC returns.
The RI behavior can be changed by command AT+QCFG=“urc/ri/ring”, refer to document [1] for
details.
NOTE
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4 GNSS Receiver
4.1. General Description
UC20 includes a fully integrated global navigation satellite system solution that supports the latest
generation gpsOne Gen8 of Qualcomm (GPS and GLONASS). Compared with GPS only, dual systems
increase usable constellation, reduce coverage gaps and TTFF, and increase positioning accuracy,
especially in rough urban environments.
UC20 works in standalone mode, allows device to demodulate GNSS assistance data, calculate position
without any assistance from the network, suitable for various application needing lowest-cost, accurate
position determination. UC20 supports Qualcomm gpsOneXTRA technology (one kind of A-GNSS), which
will download XTRA file from the internet server to enhance the TTFF. XTRA file contains predicted GPS
and GLONASS satellites coordinates and clock biases valid for up to 7days. It is the best if XTRA file is
downloaded once every 1-2 days. And UC20 also supports SBAS (including WAAS, EGNOS and MSAS),
which will improve fix accuracy.
UC20 provides power-saving solution named DPO (Dynamic Power Optimization), which attempts to turn
off GNSS RF parts, reduces current consumption by 50% at most without impact on TTFF, thus extends
battery life, and maximizes talk and standby time as well.
UC20 supports standard NMEA-0183 protocol, and outputs NMEA sentences with 1Hz via USB interface
by default.
By default, UC20 GNSS engine is switched off, it has to be switched on with AT command. For more
details about GNSS engine technology and configurations, refer to document [7].
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4.2. GNSS Performance
The following table shows UC20 GNSS performance.
Table 22: GNSS Performance
Parameter
Description
Conditions
Typ.
Unit
Sensitivity
(GNSS)
Cold start
Autonomous
-144
dBm
With LNA
-147
dBm
Reacquisition
Autonomous
-154
dBm
With LNA
-159
dBm
Tracking
Autonomous
-155
dBm
With LNA
-161
dBm
TTFF
(GNSS)
Cold start
@open sky
Autonomous
32
s
XTRA enabled
22
s
Warm start
@open sky
Autonomous
29
s
XTRA enabled
3
s
Hot start
@open sky
Autonomous
2.5
s
XTRA enabled
2
s
Accuracy
(GNSS)
CEP-50
Autonomous
@open sky
<1.5
m
1. Tracking sensitivity: the lowest GPS signal value at the antenna port for which the module can keep
on positioning for 3 minutes.
2. Reacquisition sensitivity: the lowest GPS signal value at the antenna port for which the module can
fix position again within 3 minutes after loss of lock.
3. Cold start sensitivity: the lowest GPS signal value at the antenna port for which the module fixes
position within 3 minutes after executing cold start command.
NOTES
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4.3. Layout Guideline
The following layout guideline should be taken into account in your design.
Maximize the distance between the GNSS antenna and the main GSM/UMTS antenna.
Noisy digital circuits such as the USIM card, USB interface, Camera module, Display connector and
SD card should be away from the antenna.
Use ground vias around the GNSS trace and sensitive analog signal traces to provide coplanar
isolation and protection.
Keep 50 ohm characteristic impedance of the ANT_GNSS trace.
Refer to Chapter 5 for GNSS reference design and antenna consideration.
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5 Antenna Interface
UC20 antenna interface includes a main GSM/UMTS antenna, an optional UMTS Rx-diversity antenna,
which is used to improve UMTS’s receiving performance, and a GNSS antenna. The antenna interface
has an impedance of 50Ω.
5.1. GSM/UMTS Antenna Interface
5.1.1. Pin Definition
The main antenna and UMTS Rx-diversity antenna pins definition are shown below.
Table 23: Pin Definition of the RF Antenna
Pin Name
Pin No.
I/O
Description
Comment
ANT_MAIN
49
IO
Main antenna
50Ω impedance
ANT_DIV
35
AI
Diversity antenna
50Ω impedance
5.1.2. Operating Frequency
Table 24: The Module Operating Frequencies
Band
Receive
Transmit
Unit
GSM850
869 ~ 894
824 ~ 849
MHz
EGSM900
925 ~ 960
880 ~ 915
MHz
DCS1800
1805 ~ 1880
1710 ~ 1785
MHz
PCS1900
1930 ~ 1990
1850 ~ 1910
MHz
UMTS 2100
2110 ~ 2170
1920 ~ 1980
MHz
UMTS 1900
1930 ~ 1990
1850 ~ 1910
MHz
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UMTS 900
925 ~ 960
880 ~ 915
MHz
UMTS 850
869 ~ 894
824 ~ 849
MHz
UMTS 800
875 ~ 885
830 ~ 840
MHz
5.1.3. Reference Design
The reference design of main antenna and UMTS Rx-diversity antenna is shown as below. It should
reserve a π-type matching circuit for better RF performance. The capacitors are not mounted by default.
ANT_MAIN R1 0R
C1
Module
Main
antenna
NM
C2
NM
R2 0R
C3
Diversity
antenna
NM
C4
NM
ANT_DIV
Figure 33: Reference Circuit of Antenna Interface
Keep a proper distance between main antenna and diversity antenna to improve the receiving sensitivity.
NOTE
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5.2. GNSS Antenna Interface
The following tables show the GNSS antenna pin definition and frequency specification.
Table 25: Pin Definition of GNSS Antenna
Pin Name
Pin No.
I/O
Description
Comment
ANT_GNSS
47
AI
GNSS antenna
50Ω impedance
Table 26: GNSS Frequency
Type
Frequency
Unit
GPS
1575.42±1.023
MHz
GLONASS
1597.5 ~ 1605.8
MHz
5.2.1. Reference Design for Passive Antenna
Passive
antenna
MAX2659 Module
ANT_GNSS
/SHDN
GND
RFIN
GND RFOUT
VCC VDD
MCU_GPIO
100pF 6.8nH
220nF
33pF
51K
NM
NM
56pF
D1
Figure 34: Reference Circuit of GNSS Passive Antenna
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5.2.2. Reference Design for Active Antenna
Active
antenna
VDD
Module
ANT_GNSS
47nH
10R 0.1uF
100pF
NMNM
Figure 35: Reference Circuit of GNSS Active Antenna
1. You can choose the corresponding reference circuit above according to your demands on antenna
circuit design.
2. MAX2659 is the recommended LNA chip. You can disable LNA to save power with one GPIO
shown in above figure. Pay attention to this pin’s voltage level.
3. VDD supplies power for active antenna. You can choose the right VDD according to the requirements
for active antenna. This power circuit is not needed if passive antenna is applied here.
4. All NM capacitors are reserved for adjusting RF performance.
5. The capacitance of ESD component D1 should be less than 1pF.
5.3. Antenna Installation
5.3.1. Antenna Requirement
The following table shows the requirement on GSM/UMTS antenna and GNSS antenna.
NOTES
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Table 27: Antenna Requirements
Type
Requirements
GNSS
Frequency range: 1565~1607 MHz
Polarization: RHCP or linear
VSWR: < 2 (Typ.)
Passive antenna gain: > 0dBi
Active antenna noise figure: < 1.5dB
Active antenna gain: > -2dBi
Active antenna embedded LNA gain: 20dB (Typ.)
Active antenna total gain: > 18dBi (Typ.)
GSM/UMTS
VSWR: ≤ 2
Gain (dBi): 1
Max Input Power (W): 50
Input Impedance (ohm): 50
Polarization Type: Vertical
Cable Insertion Loss: < 1dB (GSM850/900, UMTS800/850/900)
Cable Insertion Loss: < 1.5dB (GSM1800/1900, UMTS1900/2100)
5.3.2. Install the Antenna with RF Connector
The following figure is the antenna installation with RF connector provided by HIROSE. The
recommended RF connector is UF.L-R-SMT.
Figure 36: Dimensions of the UF.L-R-SMT Connector (Unit: mm)
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You can use U.FL-LP serial connector listed in the following figure to match the UF.L-R-SMT.
Figure 37: Mechanicals of UF.L-LP Connectors
The following figure describes the space factor of mated connector.
Figure 38: Space Factor of Mated Connector (Unit: mm)
For more details, please visit http://www.hirose.com.
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6 Electrical, Reliability and Radio
Characteristics
6.1. Absolute Maximum Ratings
Absolute maximum ratings for power supply and voltage on digital and analog pins of module are listed in
the following table:
Table 28: Absolute Maximum Ratings
Parameter
Min.
Max.
Unit
VBAT_RF/VBAT_BB
-0.3
4.7
V
USB_VBUS
-0.3
5.5
V
Peak Current of VBAT_BB
0
0.8
A
Peak Current of VBAT_RF
0
1.8
A
Voltage at Digital Pins
-0.3
2.3
V
Voltage at ADC0
0
2.1
V
Voltage at ADC1
0
4.2
V
6.2. Power Supply Ratings
Table 29: The Module Power Supply Ratings
Parameter
Description
Conditions
Min.
Typ.
Max.
Unit
VBAT
VBAT_BB and
VBAT_RF
Voltage must stay within the
min/max values, including voltage
3.3
3.8
4.3
V
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Parameter
Description
Conditions
Min.
Typ.
Max.
Unit
drop, ripple and spikes.
Voltage drop
during
transmitting
burst
Maximum power control level on
GSM850 and EGSM900.
400
mV
IVBAT
Peak supply
current (during
transmission
slot)
Maximum power control level on
GSM850 and EGSM900.
1.8
2.0
A
USB_VBUS
USB detection
3.0
5.0
5.25
V
6.3. Operating Temperature
The operating temperature is listed in the following table.
Table 30: Operating Temperature
Parameter
Min.
Typ.
Max.
Unit
Normal Temperature
-35
25
75
ºC
Restricted Operation
-40~ -35
75 ~ 85
ºC
Storage Temperature
-45
90
ºC
The maximum surface temperature may be up to 100ºC when module works at 85ºC ambient
temperature.
6.4. Current Consumption
The values of current consumption are shown below.
NOTE
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Table 31: The Module Current Consumption
Parameter
Description
Conditions
Typ.
Unit
IVBAT
OFF state
supply current
Power down
45
uA
GSM/GPRS
supply current
Sleep (USB disconnected)
3.6 @DRX=2
mA
1.5 @DRX=9
mA
Sleep (USB suspended)
3.7 @DRX=2
mA
1.6 @DRX=9
mA
Idle (USB disconnected)
15.0 @DRX=2
mA
Idle (USB connected)
32.0 @DRX=2
mA
WCDMA
supply current
Sleep (USB disconnected)
2.9 @DRX=6
mA
1.1 @DRX=9
mA
Sleep (USB suspended)
3.0 @DRX=6
mA
1.2 @DRX=9
mA
Idle (USB disconnected)
15.0 @DRX=6
mA
Idle (USB connected)
34.0 @DRX=6
mA
GPRS data
transfer (GNSS
off)
GSM850 1DL/1UL PCL=5
260
mA
GSM850 4DL/1UL PCL=5
276
mA
GSM850 3DL/2UL PCL=5
385
mA
GSM850 2DL/3UL PCL=5
483
mA
GSM850 1DL/4UL PCL=5
554
mA
EGSM900 1DL/1UL PCL=5
275
mA
EGSM900 4DL/1UL PCL=5
312
mA
EGSM900 3DL/2UL PCL=5
448
mA
EGSM900 2DL/3UL PCL=5
540
mA
EGSM900 1DL/4UL PCL=5
610
mA
DCS1800 1DL/1UL PCL=0
196
mA
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DCS1800 4DL/1UL PCL=0
204
mA
DCS1800 3DL/2UL PCL=0
299
mA
DCS1800 2DL/3UL PCL=0
368
mA
DCS1800 1DL/4UL PCL=0
432
mA
PCS1900 1DL/1UL PCL=0
238
mA
PCS1900 4DL/1UL PCL=0
247
mA
PCS1900 3DL/2UL PCL=0
256
mA
PCS1900 2DL/3UL PCL=0
467
mA
PCS1900 1DL/4UL PCL=0
572
mA
EDGE data
transfer (GNSS
off)
GSM850 1DL/1UL PCL=8
190
mA
GSM850 4DL/1UL PCL=8
210
mA
GSM850 3DL/2UL PCL=8
306
mA
GSM850 2DL/3UL PCL=8
400
mA
GSM850 1DL/4UL PCL=8
494
mA
EGSM900 1DL/1UL PCL=8
185
mA
EGSM900 4DL/1UL PCL=8
197
mA
EGSM900 3DL/2UL PCL=8
293
mA
EGSM900 2DL/3UL PCL=8
386
mA
EGSM900 1DL/4UL PCL=8
480
mA
DCS1800 1DL/1UL PCL=2
162
mA
DCS1800 4DL/1UL PCL=2
165
mA
DCS1800 3DL/2UL PCL=2
245
mA
DCS1800 2DL/3UL PCL=2
322
mA
DCS1800 1DL/4UL PCL=2
399
mA
PCS1900 1DL/1UL PCL=2
189
mA
PCS1900 4DL/1UL PCL=2
189
mA
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PCS1900 3DL/2UL PCL=2
298
mA
PCS1900 2DL/3UL PCL=2
401
mA
PCS1900 1DL/4UL PCL=2
503
mA
WCDMA data
transfer (GNSS
off)
UMTS Band I HSDPA @max power
557
mA
UMTS Band I HSUPA @max power
542
mA
UMTS Band II HSDPA @max power
549
mA
UMTS Band II HSUPA @max power
536
mA
UMTS Band V HSDPA @max power
593
mA
UMTS Band V HSUPA @max power
576
mA
UMTS Band VI HSDPA @max power
530
mA
UMTS Band VI HSUPA @max power
493
mA
UMTS Band VIII HSDPA @max power
539
mA
UMTS Band VIII HSUPA @max power
505
mA
GSM voice call
GSM850 @PCL=5
292
mA
EGSM900 @PCL=5
293
mA
DCS1800 @PCL=0
235
mA
PCS1900 @PCL=0
288
mA
WCDMA voice
call
UMTS Band I @max power
531
mA
UMTS Band II @max power
532
mA
UMTS Band V @max power
528
mA
UMTS Band VI @max power
470
mA
UMTS Band VIII @max power
490
mA
GNSS off
Idle, USB active @WCDMA DRX=6
34.0
mA
Cold start
(Autonomous)
83.8
mA
Tracking
(Autonomous)
74.6
mA
Tracking
(DPO on)
51.7
mA
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GNSS tracking current is tested in the following conditions:
For Cold Start, 10 minutes after First Fix.
For Hot Start, 15 seconds after First Fix.
6.5. RF Output Power
The following table shows the RF output power of UC20 module.
Table 32: Conducted RF Output Power
Frequency
Max.
Min.
GSM850
33dBm±2dB
5dBm±5dB
EGSM900
33dBm±2dB
5dBm±5dB
DCS1800
30dBm±2dB
0dBm±5dB
PCS1900
30dBm±2dB
0dBm±5dB
GSM850 (8-PSK)
27dBm±3dB
5dBm±5dB
EGSM900 (8-PSK)
27dBm±3dB
5dBm±5dB
DCS1800 (8-PSK)
26dBm±3dB
0dBm±5dB
PCS1900 (8-PSK)
26dBm±3dB
0dBm±5dB
UMTS 2100
24dBm+1/-3dB
<-50dBm
UMTS 1900
24dBm+1/-3dB
<-50dBm
UMTS 900
24dBm+1/-3dB
<-50dBm
UMTS 850
24dBm+1/-3dB
<-50dBm
UMTS 800
24dBm+1/-3dB
<-50dBm
In GPRS 4 slots TX mode, the max output power is reduced by 2.5dB. This design conforms to the GSM
specification as described in chapter 13.16 of 3GPP TS 51.010-1.
NOTE
NOTE
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6.6. RF Receiving Sensitivity
The following table shows the conducted RF receiving sensitivity of UC20 module.
Table 33: Conducted RF Receiving Sensitivity
Frequency
Receive Sensitivity (Typ.)
GSM850
-108.5dBm
EGSM900
-108.5dBm
DCS1800
-108dBm
PCS1900
-108dBm
UMTS 2100
-110dBm
UMTS 1900
-110dBm
UMTS 900
-110dBm
UMTS 850
-110dBm
UMTS 800
-110dBm
6.7. Electrostatic Discharge
The module is not protected against electrostatics discharge (ESD) in general. Consequently, it is subject
to ESD handling precautions that typically apply to ESD sensitive components. Proper ESD handling and
packaging procedures must be applied throughout the processing, handling and operation of any
application that incorporates the module.
The following table shows the module electrostatics discharge characteristics.
Table 34: Electrostatics Discharge Characteristics
Tested Points
Contact Discharge
Air Discharge
Unit
VBAT, GND
±5
±10
kV
All Antenna Interfaces
±4
±8
kV
Other Interfaces
±0.5
±1
kV
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7 Mechanical Dimensions
This chapter describes the mechanical dimensions of the module. All dimensions are measured in mm.
7.1. Mechanical Dimensions of the Module
(32+/-0.15)
(29+/-0.15)
Figure 39: UC20 Top and Side Dimensions
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3.4
3.2 3.4 3.2 3.4 3.2
4.8
32.0
29.0
Figure 40: UC20 Bottom Dimensions (Bottom View)
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Figure 41: Bottom Pads Dimensions (Bottom View)
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7.2. Footprint of Recommendation
1.9
7.8
13
1.9
9.049.3
6.45 3.45
4.4
22.1
6.16
0.8
1.3
4.8
2
3
4.6
2.5
1.0
3.4
6.8
Keepout area
29.0
Figure 42: Recommended Footprint (Top View)
1. Pads 73~84 at the bottom center of module cannot be designed. And keep out the areas shown in
pink on the above figure in the host PCB.
2. In order to maintain the module, keep about 3mm between the module and other components in the
host PCB.
NOTES
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7.3. Top View of the Module
Figure 43: Top View of the Module
7.4. Bottom View of the Module
Figure 44: Bottom View of the Module
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8 Storage and Manufacturing
8.1. Storage
UC20 is stored in the vacuum-sealed bag. The restriction of storage condition is shown as below.
Shelf life in sealed bag is 12 months at < 40ºC/90%RH.
After this bag is opened, devices that will be subjected to reflow solder or other high temperature process
must be:
Mounted within 72 hours at factory conditions of ≤ 30ºC/60%RH.
Stored at < 10% RH.
Devices require bake before mounting, if:
Humidity indicator card is > 10% when read 23ºC±5ºC.
Mounted for more than 72 hours at factory conditions of ≤ 30ºC/60% RH.
If baking is required, devices may be baked for 48 hours at 125ºC±5ºC.
As plastic container cannot be subjected to high temperature, module needs to be taken out from
container to high temperature (125ºC) bake. If shorter bake times are desired, please refer to
IPC/JEDECJ-STD-033 for bake procedure.
8.2. Manufacturing and Welding
The squeegee should push the paste on the surface of the stencil that makes the paste fill the stencil
openings and penetrate to the PCB. The force on the squeegee should be adjusted so as to produce a
clean stencil surface on a single pass. To ensure the module soldering quality, the thickness of stencil at
the hole of the module pads should be 0.18mm. For details, please refer to document [6].
NOTE
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It is suggested that peak reflow temperature is 235 ~ 245ºC (for SnAg3.0Cu0.5 alloy). Absolute max
reflow temperature is 260ºC. To avoid damage to the module when it was repeatedly heated, it is
suggested that the module should be mounted after the first panel has been reflowed. The following
picture is the actual diagram which we have operated.
Time
50 100 150 200 250 300
50
100
150
200
250
160 ºC
200 ºC
217
0
70s~120s
40s~60s
Between 1~3 ºC/s
Preheat Heating Cooling
ºC
s
Liquids Temperature
Figure 45: Liquids Temperature
8.3. Packaging
UC20 is packaged in the tap and reel carriers. One reel is 11.53m length and contains 250pcs modules.
The figure below shows the package details, measured in mm.
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30.3±0.15
29.3±0.15
30.3±0.15
32.5±0.15
33.5±0.15
0.35±0.05
4.2±0.15
3.1±0.15
32.5±0.15
33.5±0.15
4.00±0.1
2.00±0.1
1.75±0.1
20.20±0.15
44.00±0.3
44.00±0.1
1.50±0.1
Direction of feed
Cover tape
13
100
44.5+0.20
-0.00
48.5
Figure 46: Carrier Tape
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9 Appendix A Reference
Table 35: Related Documents
SN
Document Name
Remark
[1]
Quectel_UC20_AT_Commands_Manual
UC20 AT Commands Manual
[2]
Quectel_UC20_EVB_User_Guide
UC20 EVB User Guide
[3]
Quectel_UC20_Reference_Design
UC20 Reference Design
[4]
Quectel_UC20&M10_Reference_Design
UC20 and M10 Compatible Reference
Design
[5]
Quectel_UC20&M10_Compatible_Design
UC20 and M10 Compatible Design
[6]
Quectel_Module_Secondary_SMT_User_Guide
Module Secondary SMT User Guide
[7]
Quectel_UC20_GNSS_AT_Commands_Manual
UC20 GNSS AT Commands Manual
[8]
Quectel_UC20_Power_Management_Applicaition_
Note
UC20 Power Management Application
Note
Table 36: Terms and Abbreviations
Abbreviation
Description
AMR
Adaptive Multi-rate
ARP
Antenna Reference Point
bps
Bits Per Second
CEP
Circular Error Probable
CHAP
Challenge Handshake Authentication Protocol
CS
Coding Scheme
CSD
Circuit Switched Data
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CTS
Clear To Send
DCE
Data Communications Equipment (typically module)
DRX
Discontinuous Reception
DTE
Data Terminal Equipment (typically computer, external controller)
DTR
Data Terminal Ready
DTX
Discontinuous Transmission
EFR
Enhanced Full Rate
EGSM
Extended GSM900 band (includes standard GSM900 band)
ESD
Electrostatic Discharge
FR
Full Rate
GLONASS
GLObalnaya NAvigatsionnaya Sputnikovaya Sistema, the Russian Global
Navigation Satellite System
GMSK
Gaussian Minimum Shift Keying
GNSS
Global Navigation Satellite System
GPS
Global Positioning System
GSM
Global System for Mobile Communications
HR
Half Rate
HSPA
High Speed Packet Access
I/O
Input/Output
IMEI
International Mobile Equipment Identity
Imax
Maximum Load Current
Inorm
Normal Current
LED
Light Emitting Diode
LNA
Low Noise Amplifier
ME
Mobile Equipment
MO
Mobile Originated
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MS
Mobile Station (GSM engine)
MT
Mobile Terminated
PAP
Password Authentication Protocol
PBCCH
Packet Switched Broadcast Control Channel
PCB
Printed Circuit Board
PDU
Protocol Data Unit
PPP
Point-to-Point Protocol
PSK
Phase Shift Keying
QAM
Quadrature Amplitude Modulation
QPSK
Quadrature Phase Shift Keying
RF
Radio Frequency
RHCP
Right Hand Circularly Polarized
RMS
Root Mean Square (value)
RTC
Real Time Clock
Rx
Receive
SIM
Subscriber Identification Module
SMS
Short Message Service
TE
Terminal Equipment
UART
Universal Asynchronous Receiver & Transmitter
UMTS
Universal Mobile Telecommunications System
URC
Unsolicited Result Code
USIM
Universal Subscriber Identity Module
USSD
Unstructured Supplementary Service Data
Vmax
Maximum Voltage Value
Vnorm
Normal Voltage Value
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Vmin
Minimum Voltage Value
VIHmax
Maximum Input High Level Voltage Value
VIHmin
Minimum Input High Level Voltage Value
VILmax
Maximum Input Low Level Voltage Value
VILmin
Minimum Input Low Level Voltage Value
VImax
Absolute Maximum Input Voltage Value
VImin
Absolute Minimum Input Voltage Value
VOHmax
Maximum Output High Level Voltage Value
VOHmin
Minimum Output High Level Voltage Value
VOLmax
Maximum Output Low Level Voltage Value
VOLmin
Minimum Output Low Level Voltage Value
VSWR
Voltage Standing Wave Ratio
WCDMA
Wideband Code Division Multiple Access
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10 Appendix B GPRS Coding Scheme
Table 37: Description of Different Coding Schemes
Sch
eme
Code
Rate
USF
Pre-coded
USF
Radio Block
excl.USF and
BCS
BCS
Tail
Coded
Bits
Punctured
Bits
Data Rate
Kb/s
CS-1
1/2
3
3
181
40
4
456
0
9.05
CS-2
2/3
3
6
268
16
4
588
132
13.4
CS-3
3/4
3
6
312
16
4
676
220
15.6
CS-4
1
3
12
428
16
-
456
-
21.4
UMTS/HSPA Module Series
UC20 Hardware Design
UC20_Hardware_Design Confidential / Released 81 / 82
11 Appendix C GPRS Multi-slot Class
Twenty-nine classes of GPRS multi-slot modes are defined for MS in GPRS specification. Multi-slot
classes are product dependant, and determine the maximum achievable data rates in both the uplink and
downlink directions. Written as 3+1 or 2+2, the first number indicates the amount of downlink timeslots,
while the second number indicates the amount of uplink timeslots. The active slots determine the total
number of slots the GPRS device can use simultaneously for both uplink and downlink communications.
The description of different multi-slot classes is shown in the following table.
Table 38: GPRS Multi-slot Classes
Multislot Class
Downlink Slots
Uplink Slots
Active Slots
1
1
1
2
2
2
1
3
3
2
2
3
4
3
1
4
5
2
2
4
6
3
2
4
7
3
3
4
8
4
1
5
9
3
2
5
10
4
2
5
11
4
3
5
12
4
4
5
UMTS/HSPA Module
UC20 Hardware Design
UC20_Hardware_Design Confidential / Released 82 / 82
12 Appendix D EDGE Modulation and
Coding Scheme
Table 39: EDGE Modulation and Coding Scheme
Coding Scheme
Modulation
Coding Family
1 Timeslot
2 Timeslot
4 Timeslot
CS-1:
GMSK
/
9.05kbps
18.1kbps
36.2kbps
CS-2:
GMSK
/
13.4kbps
26.8kbps
53.6kbps
CS-3:
GMSK
/
15.6kbps
31.2kbps
62.4kbps
CS-4:
GMSK
/
21.4kbps
42.8kbps
85.6kbps
MCS-1
GMSK
C
8.80kbps
17.60kbps
35.20kbps
MCS-2
GMSK
B
11.2kbps
22.4kbps
44.8kbps
MCS-3
GMSK
A
14.8kbps
29.6kbps
59.2kbps
MCS-4
GMSK
C
17.6kbps
35.2kbps
70.4kbps
MCS-5
8-PSK
B
22.4kbps
44.8kbps
89.6kbps
MCS-6
8-PSK
A
29.6kbps
59.2kbps
118.4kbps
MCS-7
8-PSK
B
44.8kbps
89.6kbps
179.2kbps
MCS-8
8-PSK
A
54.4kbps
108.8kbps
217.6kbps
MCS-9
8-PSK
A
59.2kbps
118.4kbps
236.8kbps
