Quectel Wireless Solutions 201605M35 User Manual

M35 User Manual

GSM/GPRS Module Series

Rev. M35_User_Manual_V3.1

Date: 2014-11-26

www.quectel.com

GSM/GPRS Module Series

M35 User Manual

Our aim is to provide customers with timely and comprehensive service. For any assistance, please contact our company headquarters:

Quectel Wireless Solutions Co., Ltd.

Office 501, Building 13, No.99, Tianzhou Road, Shanghai, China, 200233

Tel: [phone]

Mail: [e-mail]

Or our local office, for more information, please visit:

http://www.quectel.com/support/salesupport.aspx

For technical support, to report documentation errors, please visit: http://www.quectel.com/support/techsupport.aspx

GENERAL NOTES

QUECTEL OFFERS THIS INFORMATION AS A SERVICE TO ITS CUSTOMERS. THE INFORMATION

PROVIDED IS BASED UPON CUSTOMERS’ REQUIREMENTS. QUECTEL MAKES EVERY EFFORT

TO ENSURE THE QUALITY OF THE INFORMATION IT MAKES AVAILABLE. QUECTEL DOES NOT MAKE ANY WARRANTY AS TO THE INFORMATION CONTAINED HEREIN, AND DOES NOT ACCEPT ANY LIABILITY FOR ANY INJURY, LOSS OR DAMAGE OF ANY KIND INCURRED BY USE OF OR RELIANCE UPON THE INFORMATION. ALL INFORMATION SUPPLIED HEREIN IS SUBJECT TO CHANGE WITHOUT PRIOR NOTICE.

COPYRIGHT

THIS INFORMATION CONTAINED HERE IS PROPRIETARY TECHNICAL INFORMATION OF QUECTEL CO., LTD. TRANSMITTABLE, REPRODUCTION, DISSEMINATION AND EDITING OF THIS DOCUMENT AS WELL AS UTILIZATION OF THIS CONTENTS ARE FORBIDDEN WITHOUT PERMISSION. OFFENDERS WILL BE HELD LIABLE FOR PAYMENT OF DAMAGES. ALL RIGHTS ARE RESERVED IN THE EVENT OF A PATENT GRANT OR REGISTRATION OF A UTILITY MODEL OR DESIGN.

Copyright © Quectel Wireless Solutions Co., Ltd. 2015. All rights reserved.

M35_User_Manual

Confidential / Released

1 / 85

GSM/GPRS Module Series

M35 User Manual

About the Document

History

		Revision			Date		Author			Description
1.0				2011-12-29			Luka WU			Initial
									1.		Added current consumption in GPRS
											communication mode.
1.1				2012-05-18			Luka WU		2.		Modified AT command AT+QAUDCH in Chapter
											3.10.
									3.		Modified the Footprint of recommendation.
									4.		Updated module package type.
									1.		Updated module functional diagram.
									2.		Updated Voltage ripple during transmitting.
1.2				2012-09-19			Luka WU		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.
									1.		Added information for SIM2 interface, DTR and
											DCD pin.
3.0				2014-07-25			Winter CHEN		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.
									1.		Added information for PCM interface.
									2.		Updated Figure 5: Reference Circuit for Power
3.1				2014-11-26			Winter CHEN				Supply.
									3.		Modified over-voltage or under-voltage
											automatic shutdown in Section 3.4.2
									4.		Modified RTC backup in Section 3.6
		M35_User_Manual					Confidential / Released					2 / 85

GSM/GPRS Module Series

M35 User Manual

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

M35_User_Manual

Confidential / Released

3 / 85

GSM/GPRS Module Series

M35 User Manual

Contents

About the Document...................................................................................................................................					2
Contents .......................................................................................................................................................					4
Table Index...................................................................................................................................................					7
Figure Index .................................................................................................................................................					8
1	Introduction		........................................................................................................................................		10
	1.1.	Safety Information .................................................................................................................			11
2	Product 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
3	Application 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

M35_User_Manual

Confidential / Released

4 / 85

						GSM/GPRS Module Series
						M35 User Manual
	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.			UART Application ...........................................................................................................		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 Card Application......................................................................................................		53
	3.11.		Behaviors of ...............................................................................................................The RI			57
	3.12.		Network Status ......................................................................................................Indication			58
	3.13.		Operating Status ...................................................................................................Indication			59
4	Antenna 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
5 Electrical, 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
6	Mechanical 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
7	Storage and Manufacturing ..............................................................................................................					74
	M35_User_Manual				Confidential / Released	5 / 85

				GSM/GPRS Module Series
				M35 User Manual
	7.1.	Storage ..................................................................................................................................		74
	7.2.	Soldering ...............................................................................................................................		74
	7.3.	Packaging..............................................................................................................................		75
		7.3.1. Tape and Reel Packaging ..............................................................................................		75
8	Appendix A Reference.......................................................................................................................			78
9	Appendix B GPRS Coding Scheme .................................................................................................			83
10	Appendix C GPRS Multi-slot Class..................................................................................................			85

M35_User_Manual

Confidential / Released

6 / 85

GSM/GPRS Module Series

M35 User Manual

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

M35_User_Manual

Confidential / Released

7 / 85

GSM/GPRS Module Series

M35 User Manual

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

M35_User_Manual

Confidential / Released

8 / 85

	GSM/GPRS Module Series
	M35 User Manual
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

M35_User_Manual

Confidential / Released

9 / 85

GSM/GPRS Module Series

M35 User Manual

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.

M35_User_Manual

Confidential / Released

10 / 85

GSM/GPRS Module Series

M35 User Manual

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.

M35_User_Manual

Confidential / Released

11 / 85

GSM/GPRS Module Series

M35 User Manual

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

M35_User_Manual

Confidential / Released

12 / 85

GSM/GPRS Module Series

M35 User Manual

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	Frequency	Peak	Average Gain
			Gain		VSWR	Impedance
	Number	Range (MHz)		(XZ-V)
			(XZ-V)
		GSM850:
		TX 824-849MHz
	3R007A	RX 869-894MHz	1 dBi typ.	1 dBi typ.	3 max	50Ω
		PCS1900
		TX 1850-1910MHz
		RX 1930-1990MHz

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
	M35_User_Manual	Confidential / Released	13 / 85

GSM/GPRS Module Series

M35 User Manual

	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
		 Quad-band: GSM850, EGSM900, DCS1800, PCS1900
	Frequency Bands	 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 multi-slot class 10 (default)
	GPRS Connectivity		GPRS multi-slot class 1~10 (configurable)
		 GPRS mobile station class B
		 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)
	DATA GPRS		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)
		 Normal operation: -35°C ~ +80°C
	Temperature Range		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
		Speech codec modes:
		 Half Rate (ETS 06.20)
		 Full Rate (ETS 06.10)
		 Enhanced Full Rate (ETS 06.50/06.60/06.80)
	Audio Features		Adaptive Multi-Rate (AMR)
			Echo Suppression
			Noise Reduction
		 Embedded one amplifier of class AB with maximum driving power up
			to 870mW
		UART Port:
	UART Interfaces	 Seven lines on UART port interface
		 Used for AT command, GPRS data
			Multiplexing function
	M35_User_Manual		Confidential / Released	14 / 85

				GSM/GPRS Module Series
				M35 User Manual
				 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

NOTE

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

	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

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

M35_User_Manual

Confidential / Released

15 / 85

GSM/GPRS Module Series

M35 User Manual

—Turn-on/off interface

—UART interfaces

—RTC interface

—Audio interfaces

—PCM interface

—SIM interfaces

—RF interface

	RF_ANT
		ESD	RF	PAM
	VBAT
	PWRKEY	PMU		RF Transceiver		26MHz
	EMERG_OFF	Reset
					Serial
	VRTC	RTC			Interface	UART
			BB&RF
	SIM	SIM			PCM	PCM
					Interface
	Interfaces	Interface
	Status&	GPIO&			Audio	Audio
	Netlight	PWM	MEMORY

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].

M35_User_Manual

Confidential / Released

16 / 85

GSM/GPRS Module Series

M35 User Manual

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

M35_User_Manual

Confidential / Released

17 / 85

GSM/GPRS Module Series

M35 User Manual

3.1. Pin of Module

3.1.1. Pin Assignment

GND	RF ANT	GND	GND
40	39	38	37

GND	GND
36	35

VBAT	VBAT	VRTC
34	33	32

AGND 1	31 SIM_GND
MIC2P 2	30 SIM1_CLK
MIC2N 3	29 SIM1_DATA
MIC1P 4	28 SIM1_RST
MIC1N 5	27 SIM1_VDD

Top view

SPK1N 6

26 RI/PCM_CLK

SPK1P 7

25 DCD/SIM2_RST

LOUDSPKN 8

24 RTS

LOUDSPKP 9

23 CTS

PWRKEY 10

22 TXD

EMERG_OFF 11

21 RXD

12

13

14

15

41

42

16

17

18

19

20

SYNC_PCM STATUS/

NETLIGHT

RXD_DBG

TXD_DBG

OUT_PCM

IN_PCM

DATA_SIM2

CLK_SIM2

VDD_SIM2

EXT_VDD

PRESENCE_DTR/SIM1

VBAT

GND

RF

UART

Audio

SIM

Other

Power

PCM

Figure 2: Pin Assignment

M35_User_Manual

Confidential / Released

18 / 85

GSM/GPRS Module Series

M35 User Manual

3.1.2. Pin Description

Table 3: Pin Description

Power Supply

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

Emergency Shutdown

M35_User_Manual

Confidential / Released

19 / 85

								GSM/GPRS Module Series
									M35 User Manual
		PIN NAME		PIN NO.		I/O	DESCRIPTION	DC	COMMENT
								CHARACTERISTICS
							Emergency off. Pulled		Open
							down for at least 40ms,		drain/collector
							which will turn off the	VILmax=0.45V	driver required in
		EMERG_					module in case of		cellular device
				11		I		VIHmin=1.35V
		OFF					emergency. Use it only		application.
								Vopenmax=1.8V
							when shutdown via		If unused, keep
							PWRKEY or AT command		this pin open.
							cannot be achieved.
		Module Indicator
		PIN NAME		PIN NO.		I/O	DESCRIPTION	DC	COMMENT
								CHARACTERISTICS
							Indicate module’s
							operating status. Output	VOHmin=
		STATUS		12		O	high level when module	0.85×VDD_EXT	If unused, keep
							turns on, while output low	VOLmax=	these pins open.
							level when module turns	0.15×VDD_EXT
							off.
		Audio Interfaces
		PIN NAME		PIN NO.		I/O	DESCRIPTION	DC	COMMENT
								CHARACTERISTICS
		MIC1P		4,5		I	Channel 1 positive and
		MIC1N					negative voice input		If unused, keep
									these pins open.
		MIC2P		2,3		I	Channel 2 positive and
		MIC2N					negative voice input
									1. If unused, keep
		SPK1P					Channel 1 positive and		these pins open.
				7,6		O			2. Support both
		SPK1N					negative voice output
									voice and ringtone
									output.
							Analog ground. Separate	Refer to Section 3.8	If unused, keep
		AGND		1			ground connection for
									this pin open.
							external audio circuits.
									1. If unused, keep
									these pins open.
		LOUD							2. Integrate a
		SPKN		8,9		O	Channel 3 positive and		ClassAB
		LOUD					negative voice output		amplifier internally.
		SPKP							3. Support both
									voice and ringtone
									output.
		M35_User_Manual					Confidential / Released		20 / 85

								GSM/GPRS Module Series
									M35 User Manual
		Network Status Indicator
		PIN NAME		PIN NO.		I/O	DESCRIPTION	DC	COMMENT
								CHARACTERISTICS
								VOHmin=
		NETLIGHT		13		O	Network status	0.85×VDD_EXT	If unused, keep
							indication	VOLmax=	this pin open.
								0.15×VDD_EXT
		UART Port
		PIN NAME		PIN NO.		I/O	DESCRIPTION	DC	COMMENT
								CHARACTERISTICS
		DTR		20		I	Data terminal ready	VILmin=0V
									If only use TXD,
								VILmax=
		RXD		21		I	Receive data		RXD and GND to
								0.25×VDD_EXT
									communicate,
		TXD		22		O	Transmit data	VIHmin=
									recommended
								0.75×VDD_EXT
									connecting RTS to
		RTS		24		I	Request to send	VIHmax=
									GND via 0R
								VDD_EXT+0.2
		CTS		23		O	Clear to send		resistor and
								VOHmin=
									keeping other pins
								0.85×VDD_EXT
		RI		26		O	Ring indication
									open.
								VOLmax=
		DCD		25		O	Data carrier detection	0.15×VDD_EXT

Debug Port

	PIN NAME	PIN NO.	I/O	DESCRIPTION	DC	COMMENT
					CHARACTERISTICS
	DBG_	15	O	Transmit data
	TXD					If unused, keep
					Same as above
						these pins open.
	DBG_	14	I	Receive data
	RXD
	SIM Interfaces
	PIN NAME	PIN NO	I/O	DESCRIPTION	DC	COMMENT
					CHARACTERISTICS
					The voltage can be	All signals of SIM
	SIM1_	27	O	Power supply for SIM1	selected by software	interfaces should
	VDD			card	automatically. Either	be protected
					1.8V or 3V.	against ESD with
						a TVS diode array.
					VOLmax=
	SIM1_	30	O	SIM1 clock	0.15×SIM1_VDD	Maximum trace
	CLK				VOHmin=	length is 200mm
					0.85×SIM1_VDD	from the module

M35_User_Manual

Confidential / Released

21 / 85

GSM/GPRS Module Series

M35 User Manual

					VOLmax=	pad to SIM card
	SIM1_	29	I/O	SIM1 data	0.15×SIM1_VDD	holder.
	DATA				VOHmin=
					0.85×SIM1_VDD
					VOLmax=
	SIM1_	28	O	SIM1 reset	0.15×SIM1_VDD
	RST				VOHmin=
					0.85×SIM1_VDD
					VILmin=0V
					VILmax=
	SIM1_				0.25×VDD_EXT
		20	I	SIM1 card detection.	VIHmin=
	PRESENCE
					0.75×VDD_EXT
					VIHmax=
					VDD_EXT+0.2
	SIM_	31		SIM ground
	GND
					The voltage can be
	SIM2_	18	O	Power supply for SIM2	selected by software
	VDD			card	automatically. Either
					1.8V or 3V.
					VOLmax=
	SIM2_	17	O	SIM2 clock	0.15×SIM2_VDD
	CLK				VOHmin=
					0.85×SIM2_VDD
					VOLmax=
	SIM2_	16	I/O	SIM2 data	0.15×SIM2_VDD
	DATA				VOHmin=
					0.85×SIM2_VDD
					VOLmax=
	SIM2_	25	O	SIM2 reset	0.15×SIM2_VDD
	RST				VOHmin=
					0.85×SIM2_VDD
	RF Interface
	PIN NAME	PIN NO.	I/O	DESCRIPTION	DC	COMMENT
					CHARACTERISTICS
	RF_ANT	39	I/O	RF antenna pad	Impedance of 50Ω
	PCM Interface
	PIN NAME	PIN NO.	I/O	DESCRIPTION	DC	COMMENT
					CHARACTERISTICS

M35_User_Manual

Confidential / Released

22 / 85

GSM/GPRS Module Series

M35 User Manual

VILmin=-0.3V

The default

PCM_

12

O

PCM sync signal

VILmax=

function is

SYNC

0.25×VDD_EXT

STATUS after

VIHmin=

startup.

0.75×VDD_EXT

PCM_

The default

26

O

PCM clock signal

VIHmax=

function is RI after

CLK

VDD_EXT+0.2

startup.

VOHmin=

PCM_

41

O

PCM serial data output

OUT

0.85×VDD_EXT

If unused, keep

VOLmax=

these pins open.

PCM_IN

42

I

PCM serial data input

0.15×VDD_EXT

Table 4: Multiplexed Functions

PIN NAME

PIN NO.

Function After Reset

Alternate Function1)

STATUS/PCM_SYNC

12

STATUS

PCM_SYNC

DTR/SIM1_PRESENCE

20

DTR

SIM1_PRESENCE

DCD/SIM2_RST

25

DCD

SIM2_RST

RI/PCM_CLK

26

RI

PCM_CLK

NOTE

1) The alternate function can be configured through AT command. For details, please refer to the section 3.9 and section 3.10.

3.2. Operating Modes

The table below briefly summarizes the various operating modes in the following chapters.

Table 5: Overview of Operating Modes

	Mode		Function

Normal Operation

GSM/GPRS

Sleep

After enabling sleep mode by ―AT+QSCLK=1‖, the module will automatically go into Sleep Mode if DTR is set to high level and there is no interrupt (such as GPIO interrupt or data on UART port). In this case, the current consumption of module will be reduced to the minimal level. During

M35_User_Manual

Confidential / Released

23 / 85

GSM IDLE

GSM TALK

GPRS IDLE

GPRS STANDBY

GPRS READY

GPRS DATA

GSM/GPRS Module Series

M35 User Manual

Sleep Mode, the module can still receive paging message and SMS from the system normally.

Software is active. The module has registered to the GSM network, and the module is ready to send and receive GSM 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.

The module is not registered to GPRS network. The module is not reachable through GPRS channel.

The module is registered to GPRS network, but no GPRS PDP context is active. The SGSN knows the Routing Area where the module is located at.

The PDP context is active, but no data transfer is ongoing.

The module is ready to receive or send GPRS data. The

SGSN knows the cell where the module is located at.

There is GPRS data in transfer. In this mode, power consumption is decided by the PCL, working RF band and GPRS multi-slot configuration.

Normal shutdown by sending the ―AT+QPOWD=1‖ command, using the

PWRKEY or the EMERG_OFF1) pin. The power management ASIC

POWER DOWN

disconnects the power supply from the base band part of the module, and only the power supply for the RTC is remained. Software is not active. The UART interfaces are not accessible. Operating voltage (connected to VBAT) remains applied.

Minimum Functionality

―AT+CFUN‖ command can set the module to a minimum functionality mode

Mode (without

without removing the power supply. In this case, the RF part of the module

Removing Power

will not work or the SIM card will not be accessible, or both RF part and SIM

Supply)

card will be disabled, but the UART port is still accessible. The power consumption in this case is very low.

NOTE

1) Use the EMERG_OFF pin only when failing to turn off the module by the command ―AT+QPOWD=1‖ and the PWRKEY pin. For more details, please refer to the Section 3.4.2.4.

M35_User_Manual

Confidential / Released

24 / 85

GSM/GPRS Module Series

M35 User Manual

3.3. Power Supply

3.3.1. Power Features of Module

The power supply is one of the key issues in designing GSM terminals. Because of the 577us radio burst in GSM every 4.615ms, power supply must be able to deliver high current peaks in a burst period. During these peaks, drops on the supply voltage must not exceed minimum working voltage of module.

For M35 module, the max current consumption could reach to 1.6A during a transmit burst. It will cause a large voltage drop on the VBAT. In order to ensure stable operation of the module, it is recommended that the max voltage drop during the transmit burst does not exceed 400mV.

4.615ms

577us

Burst:1.6A

IBAT

VBAT

Vdrop

Figure 3: Voltage Ripple during Transmitting

3.3.2. Decrease Supply Voltage Drop

The power supply range of the module is 3.3V to 4.6V. Make sure that the input voltage will never drop below 3.3V even in a transmitting burst. If the power voltage drops below 3.3V, the module could turn off automatically. For better power performance, it is recommended to place a 100uF tantalum capacitor with low ESR (ESR=0.7Ω) and ceramic capacitor 100nF, 33pF and 10pF near the VBAT pin. The reference circuit is illustrated in Figure 4.

The VBAT route should be wide enough to ensure that there is not too much voltage drop during transmit burst. The width of trace should be no less than 2mm and the principle of the VBAT route is the longer route, the wider trace.

M35_User_Manual

Confidential / Released

25 / 85