Quectel M35 User manual

M35 User Manual
GSM/GPRS Module Series
Rev. M35_User_Manual_V3.1
Date: 2014-11-26
www.quectel.com

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About the Document
History
Revision
Date
Author
Description
1.0
2011-12-29
Luka WU
Initial
1.1
2012-05-18
Luka WU
1. Added current consumption in GPRS
communication mode.
2. Modified AT command AT+QAUDCH in Chapter
3.10.
3. Modified the Footprint of recommendation.
4. Updated module package type.
1.2
2012-09-19
Luka WU
1. Updated module functional diagram.
2. Updated Voltage ripple during transmitting.
3. Modified level match reference circuits for 5V
peripheral system.
4. Updated SIM card reference circuit.
5. Added module current consumption.
1.3
2013-09-03
Winter CHEN
1. Updated information on module’s packaging.
2. Used the new technical document template.
1.4
2013-11-04
Felix YIN
Optimized the parameters of VBAT ripple in Table 24.
3.0
2014-07-25
Winter CHEN
1. Added information for SIM2 interface, DTR and
DCD pin.
2. Added information for Multi UART.
3. Modified module’s current consumption.
4. Modified module’s pin definition.
5. Modified DC characteristics of module pin.
3.1
2014-11-26
Winter CHEN
1. Added information for PCM interface.
2. Updated Figure 5: Reference Circuit for Power
Supply.
3. Modified over-voltage or under-voltage
automatic shutdown in Section 3.4.2
4. Modified RTC backup in Section 3.6

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5. Modified UART application in Section 3.7.3
6. Modified SIM card interface in Section 3.10
7. Added antenna requirement in Section 4.5

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Contents
About the Document...................................................................................................................................2
Contents.......................................................................................................................................................4
Table Index...................................................................................................................................................7
Figure Index.................................................................................................................................................8
1Introduction........................................................................................................................................10
1.1. Safety Information .................................................................................................................11
2Product Concept................................................................................................................................12
2.1. General Description...............................................................................................................12
2.2. Directives and Standards......................................................................................................12
2.2.1. FCC Radiation Exposure Statement..............................................................................12
2.3. Key Features.........................................................................................................................13
2.4. Functional Diagram...............................................................................................................15
2.5. Evaluation Board...................................................................................................................16
3Application Interface .........................................................................................................................17
3.1. Pin of Module.........................................................................................................................18
3.1.1. Pin Assignment ..............................................................................................................18
3.1.2. Pin Description...............................................................................................................19
3.2. Operating Modes...................................................................................................................23
3.3. Power Supply ........................................................................................................................25
3.3.1. Power Features of Module.............................................................................................25
3.3.2. Decrease Supply Voltage Drop......................................................................................25
3.3.3. Reference Design for Power Supply..............................................................................26
3.3.4. Monitor Power Supply....................................................................................................27
3.4. Power On and Down Scenarios............................................................................................27
3.4.1. Power On .......................................................................................................................27
3.4.2. Power Down...................................................................................................................29
3.4.2.1. Power Down Module Using the PWRKEY Pin..................................................29
3.4.2.2. Power Down Module Using AT Command........................................................30
3.4.2.3. Over-voltage or Under-voltage Automatic Shutdown........................................30
3.4.2.4. Emergency Shutdown Using EMERG_OFF Pin...............................................31
3.4.3. Restart............................................................................................................................32
3.5. Power Saving ........................................................................................................................33
3.5.1. Minimum Functionality Mode.........................................................................................33
3.5.2. SLEEP Mode..................................................................................................................34
3.5.3. Wake Up Module from SLEEP Mode.............................................................................34
3.5.4. Summary of State Transition..........................................................................................35
3.6. RTC Backup ..........................................................................................................................35
3.7. Serial Interfaces.....................................................................................................................37

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3.7.1. UART Port......................................................................................................................39
3.7.1.1. The Features of UART Port...............................................................................39
3.7.1.2. The Connection of UART..................................................................................40
3.7.1.3. Firmware Upgrade.............................................................................................42
3.7.2. Debug Port.....................................................................................................................42
3.7.3. UARTApplication...........................................................................................................43
3.8. Audio Interfaces.....................................................................................................................44
3.8.1. Decrease TDD Noise and Other Noise..........................................................................46
3.8.2. Microphone Interfaces Design.......................................................................................46
3.8.3. Receiver Interface Design..............................................................................................47
3.8.4. Earphone Interface Design............................................................................................47
3.8.5. Loud Speaker Interface Design .....................................................................................48
3.8.6. Audio Characteristics.....................................................................................................48
3.9. PCM Interface........................................................................................................................49
3.9.1. Configuration..................................................................................................................50
3.9.2. Timing.............................................................................................................................50
3.9.3. Reference Design ..........................................................................................................52
3.9.4. AT Command .................................................................................................................52
3.10. SIM Card Interfaces ..............................................................................................................53
3.10.1. SIM CardApplication......................................................................................................53
3.11. Behaviors of The RI...............................................................................................................57
3.12. Network Status Indication......................................................................................................58
3.13. Operating Status Indication...................................................................................................59
4Antenna Interface...............................................................................................................................61
4.1. RF Reference Design............................................................................................................61
4.2. RF Output Power...................................................................................................................62
4.3. RF Receiving Sensitivity........................................................................................................62
4.4. Operating Frequencies..........................................................................................................63
4.5. Antenna Requirement ...........................................................................................................63
4.6. RF Cable Soldering...............................................................................................................64
5Electrical, Reliability and Radio Characteristics............................................................................65
5.1. Absolute Maximum Ratings...................................................................................................65
5.2. Operating Temperature .........................................................................................................65
5.3. Power Supply Ratings...........................................................................................................66
5.4. Current Consumption............................................................................................................67
5.5. Electro-static Discharge ........................................................................................................68
6Mechanical Dimensions....................................................................................................................70
6.1. Mechanical Dimensions of Module .......................................................................................70
6.2. Recommended Footprint.......................................................................................................72
6.3. Top View of the Module.........................................................................................................73
6.4. Bottom View of the Module ...................................................................................................73
7Storage and Manufacturing ..............................................................................................................74

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7.1. Storage..................................................................................................................................74
7.2. Soldering ...............................................................................................................................74
7.3. Packaging..............................................................................................................................75
7.3.1. Tape and Reel Packaging..............................................................................................75
8Appendix A Reference.......................................................................................................................78
9Appendix B GPRS Coding Scheme .................................................................................................83
10 Appendix C GPRS Multi-slot Class..................................................................................................85

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Table Index
TABLE 1: MODULE KEY FEATURES............................................................................................................... 13
TABLE 2: CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE........................ 15
TABLE 3: PIN DESCRIPTION........................................................................................................................... 19
TABLE 4: MULTIPLEXED FUNCTIONS............................................................................................................ 23
TABLE 5: OVERVIEW OF OPERATING MODES............................................................................................. 23
TABLE 6: SUMMARY OF STATE TRANSITION ............................................................................................... 35
TABLE 7: LOGIC LEVELS OF THE UART INTERFACES................................................................................ 38
TABLE 8: PIN DEFINITION OF THE UART INTERFACES .............................................................................. 38
TABLE 9: PIN DEFINITION OF AUDIO INTERFACE ....................................................................................... 44
TABLE 10: AOUT2 OUTPUT CHARACTERISTICS.......................................................................................... 45
TABLE 11: TYPICAL ELECTRET MICROPHONE CHARACTERISTICS......................................................... 48
TABLE 12: TYPICAL SPEAKER CHARACTERISTICS .................................................................................... 48
TABLE 13: PIN DEFINITION OF PCM INTERFACE......................................................................................... 49
TABLE 14: CONFIGURATION........................................................................................................................... 50
TABLE 15: QPCMON COMMAND DESCRIPTION .......................................................................................... 53
TABLE 16: QPCMVOL COMMAND DESCRIPTION......................................................................................... 53
TABLE 17: PIN DEFINITION OF THE SIM INTERFACES................................................................................ 54
TABLE 18: BEHAVIORS OF THE RI................................................................................................................. 57
TABLE 19: WORKING STATE OF THE NETLIGHT.......................................................................................... 58
TABLE 20: PIN DEFINITION OF THE STATUS................................................................................................ 59
TABLE 21: PIN DEFINITION OF THE RF_ANT................................................................................................ 61
TABLE 22: THE MODULE CONDUCTED RF OUTPUT POWER .................................................................... 62
TABLE 23: THE MODULE CONDUCTED RF RECEIVING SENSITIVITY....................................................... 62
TABLE 24: THE MODULE OPERATING FREQUENCIES................................................................................ 63
TABLE 25: ANTENNA CABLE REQUIREMENTS............................................................................................. 63
TABLE 26: ANTENNA REQUIREMENTS.......................................................................................................... 63
TABLE 27: ABSOLUTE MAXIMUM RATINGS.................................................................................................. 65
TABLE 28: OPERATING TEMPERATURE........................................................................................................ 65
TABLE 29: THE MODULE POWER SUPPLY RATINGS .................................................................................. 66
TABLE 30: THE MODULE CURRENT CONSUMPTION.................................................................................. 67
TABLE 31: THE ESD ENDURANCE (TEMPERATURE: 25ºC, HUMIDITY: 45%)............................................ 69
TABLE 32: REEL PACKING .............................................................................................................................. 77
TABLE 33: RELATED DOCUMENTS................................................................................................................ 78
TABLE 34: TERMS AND ABBREVIATIONS...................................................................................................... 79
TABLE 35: DESCRIPTION OF DIFFERENT CODING SCHEMES.................................................................. 83
TABLE 36: GPRS MULTI-SLOT CLASSES ...................................................................................................... 85

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Figure Index
FIGURE 1: MODULE FUNCTIONAL DIAGRAM............................................................................................... 16
FIGURE 2: PIN ASSIGNMENT ......................................................................................................................... 18
FIGURE 3: VOLTAGE RIPPLE DURING TRANSMITTING .............................................................................. 25
FIGURE 4: REFERENCE CIRCUIT FOR THE VBAT INPUT ........................................................................... 26
FIGURE 5: REFERENCE CIRCUIT FOR POWER SUPPLY............................................................................ 26
FIGURE 6: TURN ON THE MODULE WITH AN OPEN-COLLECTOR DRIVER.............................................. 27
FIGURE 7: TURN ON THE MODULE WITH A BUTTON.................................................................................. 28
FIGURE 8: TURN-ON TIMING.......................................................................................................................... 28
FIGURE 9: TURN-OFF TIMING........................................................................................................................ 29
FIGURE 10: AN OPEN-COLLECTOR DRIVER FOR EMERG_OFF................................................................ 31
FIGURE 11: REFERENCE CIRCUIT FOR EMERG_OFF BY USING BUTTON.............................................. 32
FIGURE 12: TIMING OF RESTARTING SYSTEM............................................................................................ 32
FIGURE 13: TIMING OF RESTARTING SYSTEM AFTER EMERGENCY SHUTDOWN................................ 33
FIGURE 14: VRTC IS SUPPLIED BY A NON-CHARGEABLE BATTERY........................................................ 36
FIGURE 15: VRTC IS SUPPLIED BY A RECHARGEABLE BATTERY............................................................ 36
FIGURE 16: VRTC IS SUPPLIED BY A CAPACITOR ...................................................................................... 36
FIGURE 17: REFERENCE DESIGN FOR FULL-FUNCTION UART................................................................ 40
FIGURE 18: REFERENCE DESIGN FOR UART PORT................................................................................... 41
FIGURE 19: REFERENCE DESIGN FOR UART PORT WITH HARDWARE FLOW CONTROL.................... 41
FIGURE 20: REFERENCE DESIGN FOR FIRMWARE UPGRADE................................................................. 42
FIGURE 21: REFERENCE DESIGN FOR DEBUG PORT ............................................................................... 43
FIGURE 22: LEVEL MATCH DESIGN FOR 3.3V SYSTEM.............................................................................. 43
FIGURE 23: SKETCH MAP FOR RS-232 INTERFACE MATCH...................................................................... 44
FIGURE 24: REFERENCE DESIGN FOR AIN1&AIN2..................................................................................... 46
FIGURE 25: REFERENCE INTERFACE DESIGN OF AOUT1......................................................................... 47
FIGURE 26: EARPHONE INTERFACE DESIGN.............................................................................................. 47
FIGURE 27: LOUD SPEAKER INTERFACE DESIGN...................................................................................... 48
FIGURE 28: LONG SYNCHRONIZATION & SIGN EXTENSION DIAGRAM................................................... 51
FIGURE 29: LONG SYNCHRONIZATION & ZERO PADDING DIAGRAM....................................................... 51
FIGURE 30: SHORT SYNCHRONIZATION & SIGN EXTENSION DIAGRAM................................................. 51
FIGURE 31: SHORT SYNCHRONIZATION & ZERO PADDING DIAGRAM .................................................... 52
FIGURE 32: REFERENCE DESIGN FOR PCM ............................................................................................... 52
FIGURE 33: REFERENCE CIRCUIT FOR SIM1 INTERFACE WITH 8-PIN SIM CARD HOLDER ................. 55
FIGURE 34: REFERENCE CIRCUIT FOR SIM1 INTERFACE WITH THE 6-PIN SIM CARD HOLDER ......... 55
FIGURE 35: REFERENCE CIRCUIT FOR SIM2 INTERFACE WITH THE 6-PIN SIM CARD HOLDER ......... 56
FIGURE 36: RI BEHAVIOR OF VOICE CALLING AS A RECEIVER................................................................ 57
FIGURE 37: RI BEHAVIOR AS A CALLER ....................................................................................................... 58
FIGURE 38: RI BEHAVIOR OF URC OR SMS RECEIVED ............................................................................. 58
FIGURE 39: REFERENCE DESIGN FOR NETLIGHT ..................................................................................... 59
FIGURE 40: REFERENCE DESIGN FOR STATUS.......................................................................................... 60
FIGURE 41: REFERENCE DESIGN FOR RF .................................................................................................. 61

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FIGURE 42: RF SOLDERING SAMPLE ........................................................................................................... 64
FIGURE 43: M35 MODULE TOP AND SIDE DIMENSIONS (UNIT: MM)......................................................... 70
FIGURE 44: M35 MODULE BOTTOM DIMENSIONS (UNIT: MM)................................................................... 71
FIGURE 45: RECOMMENDED FOOTPRINT (UNIT: MM)................................................................................ 72
FIGURE 46: TOP VIEW OF THE MODULE...................................................................................................... 73
FIGURE 47: BOTTOM VIEW OF THE MODULE.............................................................................................. 73
FIGURE 48: RAMP-SOAK-SPIKE REFLOW PROFILE.................................................................................... 75
FIGURE 49: TAPE AND REEL SPECIFICATION.............................................................................................. 76
FIGURE 50: DIMENSIONS OF REEL............................................................................................................... 77
FIGURE 51: RADIO BLOCK STRUCTURE OF CS-1, CS-2 AND CS-3........................................................... 83
FIGURE 52: RADIO BLOCK STRUCTURE OF CS-4....................................................................................... 84

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1 Introduction
This document defines the M35 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 M35 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 M35 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 your 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 mobie while driving (even with a handsfree kit) cause distraction
and can lead to an accident. You must comply with laws and regulations restrcting
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 Flight
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
M35 is a Quad-band GSM/GPRS engine that works at frequencies of GSM850MHz, EGSM900,
DCS1800 and PCS1900MHz. The M35 features GPRS multi-slot class 12 and supports the GPRS coding
schemes CS-1, CS-2, CS-3 and CS-4. For more details about GPRS multi-slot classes and coding
schemes, please refer to the Appendix B & C.
With a tiny profile of 19.9mm ×23.6mm ×2.65mm, the module can meet almost all the requirements for
M2M applications, including Vehicles and Personal Tracking, Security System, Wireless POS, Industrial
PDA, Smart Metering, and Remote Maintenance & Control, etc.
M35 is an SMD type module with LCC package, which can be easily embedded into applications. It
provides abundant hardware interfaces like Audio and UART Interface.
Designed with power saving technique, the current consumption of M35 is as low as 1.3 mA in SLEEP
mode when DRX is 5.
M35 is integrated with Internet service protocols, such as TCP/UDP, FTP and PPP. Extended AT
commands have been developed for you to use these Internet service protocols easily.
The module fully complies with the RoHS directive of the European Union.
2.2. Directives and Standards
The M35 module is designed to comply with the FCC statements. FCC ID: XMR201512M35
The Host system using M35, should have label indicated FCC ID: XMR201512M35.
2.2.1. FCC Radiation Exposure Statement
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment.
This equipment should be installed and operated with minimum distance 20cm between the radiator and
your body as well as kept minimum 20cm from radio antenna depending on the Mobile status of this

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module usage. This module should NOT be installed and operating simultaneously with other radio.
The manual of the host system, which uses M35 must include RF exposure warning statement to advice
user should keep minimum 20cm from the radio antenna of M35 module depending on the Mobile status.
Note: If a portable device (such as PDA) uses M35 module, the device needs to do permissive change
and SAR testing.
The following list of antenna is indicating the maximum permissible antenna gain.
Part
Number
Frequency
Range (MHz)
Peak
Gain
(XZ-V)
Average Gain
(XZ-V)
VSWR
Impedance
3R007A
GSM850:
TX 824-849MHz
RX 869-894MHz
PCS1900：
TX 1850-1910MHz
RX 1930-1990MHz
1 dBi typ.
1 dBi typ.
3 max
50Ω
Antenna gain including cable loss must not exceed 4.95 dBi of GSM 850 and 2.5 dBi of PCS 1900 for th
e purpose of satisfying the requirements of 2.1043 and 2.1091. The antenna(s) used for this
transmitter must be installed to provide a separation distance of at least 20cm from all persons and
must not be co-located or operated in conjunction with any antenna or transmitter not described
under this FCC ID. The final product operating with this transmitter must include operating
instructions and antenna installation instructions, for end-users and installers to satisfy RF exposure
compliance requirements. Compliance of this device in all final product configurations is the
responsibility of the Grantee. Installation of this device into specific final products may require the
submission of a Class II permissive change application containing data pertinent to RF Exposure,
spurious emissions, ERP/EIRP, and host/module authentication, or new application if appropriate.
Installation of this device into specific final products may require the submission of a Class II
permissive change application containing data pertinent to RF Exposure, spurious emissions,
ERP/EIRP, and host/module authentication, or new application if appropriate.
2.3. Key Features
The following table describes the detailed features of M35 module.
Table 1: Module Key Features
Feature
Implementation

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Power Supply
Single supply voltage: 3.3V ~ 4.6V
Typical supply voltage: 4V
Power Saving
Typical power consumption in SLEEP mode: 1.3 mA@DRX=5
1.2 mA @DRX=9
Frequency Bands
Quad-band: GSM850, EGSM900, DCS1800, PCS1900
The module can search these frequency bands automatically
The frequency bands can be set by AT command
Compliant to GSM Phase 2/2+
GSM Class
Small MS
Transmitting Power
Class 4 (2W) at GSM850 and EGSM900
Class 1 (1W) at DCS1800 and PCS1900
GPRS Connectivity
GPRS multi-slot class 10 (default)
GPRS multi-slot class 1~10 (configurable)
GPRS mobile station class B
DATA GPRS
GPRS data downlink transfer: max. 85.6kbps
GPRS data uplink transfer: max. 85.6kbps
Coding scheme: CS-1, CS-2, CS-3 and CS-4
Support the protocols PAP (Password Authentication Protocol)
usually used for PPP connections
Internet service protocols :
TCP/UDP/FTP/PPP/HTTP/NTP/MMS/SMTP/PING
Support Packet Broadcast Control Channel (PBCCH)
Support Unstructured Supplementary Service Data (USSD)
Temperature Range
Normal operation: -35°C ~ +80°C
Restricted operation: -40°C ~ -35°C and +80°C ~ +85°C 1)
Storage temperature: -45°C ~ +90°C
SMS
Text and PDU mode
SMS storage: SIM card
SIM Interfaces
Support SIM card: 1.8V, 3V
Audio Features
Speech codec modes:
Half Rate (ETS 06.20)
Full Rate (ETS 06.10)
Enhanced Full Rate (ETS 06.50/06.60/06.80)
Adaptive Multi-Rate (AMR)
Echo Suppression
Noise Reduction
Embedded one amplifier of class AB with maximum driving power up
to 870mW
UART Interfaces
UART Port:
Seven lines on UART port interface
Used for AT command, GPRS data
Multiplexing function

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1) When the module works within this temperature range, the deviations from the GSM specification may
occur. For example, the frequency error or the phase error will be increased.
Table 2: Coding Schemes and Maximum Net Data Rates over Air Interface
2.4. Functional Diagram
The following figure shows a block diagram of M35 and illustrates the major functional parts.
Radio frequency part
Power management
The Peripheral interface
—Power supply
Support autobauding from 4800bps to 115200bps
Debug Port:
Two lines on debug port interface DBG_TXD and DBG_RXD
Debug Port can used for firmware debugging
Phonebook Management
Support phonebook types: SM, ME, FD, ON, MT
SIM Application Toolkit
Support SAT class 3, GSM 11.14 Release 99
Real Time Clock
Supported
Physical Characteristics
Size: 19.9±0.15 ×23.6±0.15 ×2.65±0.2mm
Weight: Approx. 2.5g
Firmware Upgrade
Firmware upgrade via UART Port
Antenna Interface
Connected to antenna pad with 50 Ohm impedance control
Coding Scheme
1 Timeslot
2 Timeslot
4 Timeslot
CS-1
9.05kbps
18.1kbps
36.2kbps
CS-2
13.4kbps
26.8kbps
53.6kbps
CS-3
15.6kbps
31.2kbps
62.4kbps
CS-4
21.4kbps
42.8kbps
85.6kbps
NOTE

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—Turn-on/off interface
—UART interfaces
—RTC interface
—Audio interfaces
—PCM interface
—SIM interfaces
—RF interface
BB&RF
RF PAM
26MHzRF Transceiver
RTC
GPIO&
PWM
Serial
Interface
SIM
Interface
RF_ANT
VBAT
PWRKEY
EMERG_OFF
VRTC
Status&
Netlight
UART
SIM
Interfaces
Reset
ESD
PMU
MEMORY Audio Audio
PCM
Interface PCM
Figure 1: Module Functional Diagram
2.5. Evaluation Board
In order to help you to develop applications with M35, Quectel supplies an evaluation board (EVB),
RS-232 to USB cable, power adapter, earphone, antenna and other peripherals to control or test the
module. For details, please refer to the document [4].

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3 Application Interface
The module adopts LCC package and has 42 pins. The following chapters provide detailed descriptions
about these pins below:
Power supply
Power on/down
RTC
Serial interfaces
Audio interfaces
PCM interface
SIM interfaces
RI
NETLIGHT
STATUS

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3.1. Pin of Module
3.1.1. Pin Assignment
VBAT RF
Other
GND UART Audio
Power
SIM
SIM_GND
31
SIM1_CLK
30
SIM1_DATA
29
SIM1_RST
28
SIM1_VDD
27
PCM_OUT
41
PCM_IN
42
SIM2_VDD
18
SIM2_CLK
17
SIM2_DATA
16 19
VDD_EXT
PWRKEY 10
EMERG_OFF 11
STATUS/ PCM_SYNC
12
NETLIGHT
13
Top view
37
GND
39
RF_ANT
34
VBAT
1
AGND
32
VRTC
38
GND
40
GND
36
GND
35
GND
33
VBAT
25 DCD/SIM2_RST
24 RTS
23 CTS
22 TXD
21 RXD
26 RI/PCM_CLK
2
MIC2P
3
MIC2N
4
MIC1P
5
MIC1N
6
SPK1N
7
SPK1P
8
LOUDSPKN
9
LOUDSPKP
14
DBG_RXD
15
DBG_TXD
20
DTR/SIM1_PRESENCE
PCM
Figure 2: Pin Assignment

GSM/GPRS Module Series
M35 User Manual
M35_User_Manual Confidential / Released 19 / 85
3.1.2. Pin Description
Table 3: Pin Description
Power Supply
PIN NAME
PIN NO.
I/O
DESCRIPTION
DC
CHARACTERISTICS
COMMENT
VBAT
33, 34
I
Main power supply of
module:
VBAT=3.3V~4.6V
Vmax=4.6V
Vmin=3.3V
Vnorm=4.0V
Make sure that
supply sufficient
current in a
transmitting burst
typically rises to
1.6A.
VRTC
32
I/O
Power supply for RTC
when VBAT is not supplied
for the system.
Charging for backup
battery or golden capacitor
when the VBAT is applied.
VImax=3.3V
VImin=1.5V
VInorm=2.8V
VOmax=3V
VOmin=2V
VOnorm=2.8V
Iout(max)=2mA
Iin≈10uA
If unused, keep
this pin open.
VDD_
EXT
19
O
Supply 2.8V voltage for
external circuit.
Vmax=2.9V
Vmin=2.7V
Vnorm=2.8V
Imax=20mA
1. If unused, keep
this pin open.
2. Recommend to
add a 2.2~4.7uF
bypass capacitor,
when using this
pin for power
supply.
GND
35,36,3
7,38, 40
Ground
Turn on/off
PIN NAME
PIN NO.
I/O
DESCRIPTION
DC
CHARACTERISTICS
COMMENT
PWRKEY
10
I
Power on/off key.
PWRKEY should be pulled
down for a moment to turn
on or turn off the system.
VILmax=
0.1×VBAT
VIHmin=
0.6×VBAT
VImax=3.1V
Emergency Shutdown