Quectel Wireless Solutions 201202M35 Users Manual

M35 Hardware Design

M35

Quectel Cellular Engine

Hardware Design

M35_HD_V1.0

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M35 Hardware Design

Document Title

M35 Hardware Design

Revision

1.0

Date

2012-02-06

Status

Released

Document Control ID

M35_HD_V1.0

Quectel

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General Notes

Quectel offers this information as a service to its customers, to support application and engineering efforts that use the products designed by Quectel. The information provided is based upon requirements specifically provided for customers of Quectel. Quectel has not undertaken any independent search for additional information, relevant to any information that may be in the

customer’s possession. Furthermore, system validation of this product designed by Quectel within

a larger electronic system remains the responsibility of the customer or the customer’s system integrator. All specifications supplied herein are subject to change.

Copyright

This document contains proprietary technical information of Quectel Co., Ltd. Copying this document, distribution to others, and communication of the contents thereof, are forbidden without permission. Offenders are liable to the payment of damages. All rights are reserved in the event of a patent grant or registration of a utility model or design. All specifications supplied herein are subject to change without notice at any time.

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M35 Hardware Design

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Table Index

TABLE 1: RELATED DOCUMENTS .................................................................................................... 9

TABLE 2: TERMS AND ABBREVIATIONS ...................................................................................... 10

TABLE 3: MODULE KEY FEATURES ............................................................................................... 15

TABLE 4: CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE 17

TABLE 5: M35 PIN ASSIGNMENT..................................................................................................... 20

TABLE 6: PIN DESCRIPTION ............................................................................................................. 21

TABLE 7: OVERVIEW OF OPERATING MODES ............................................................................ 26

TABLE 8: SUMMARY OF STATE TRANSITION ............................................................................. 37

TABLE 9: LOGIC LEVELS OF THE UART INTERFACE ................................ ................................ . 40

TABLE 10: PIN DEFINITION OF THE UART INTERFACES .......................................................... 40

TABLE 11: PIN DEFINITION OF AUDIO INTERFACE ................................................................... 48

TABLE 12: AOUT2 OUTPUT CHARACTERISTICS ......................................................................... 49

TABLE 13: TYPICAL ELECTRET MICROPHONE CHARACTERISTICS ...................................... 52

TABLE 14: TYPICAL SPEAKER CHARACTERISTICS ................................................................... 52

TABLE 15: PIN DEFINITION OF THE SIM INTERFACE ................................................................ 53

TABLE 16: PIN DESCRIPTION OF AMPHENOL SIM CARD HOLDER......................................... 54

TABLE 17: BEHAVIORS OF THE RI.................................................................................................. 55

TABLE 18: WORKING STATE OF THE NETLIGHT ........................................................................ 57

TABLE 19: PIN DEFINITION OF THE STATUS ............................................................................... 57

TABLE 20: PIN DEFINITION OF THE ANTENNA INTERFACE .................................................... 59

TABLE 21: THE MODULE CONDUCTED RF OUTPUT POWER ................................................... 60

TABLE 22: THE MODULE CONDUCTED RF RECEIVING SENSITIVITY ................................... 60

TABLE 23: THE MODULE OPERATING FREQUENCIES ............................................................... 60

TABLE 24: ABSOLUTE MAXIMUM RATINGS ................................................................................ 62

TABLE 25: OPERATING TEMPERATURE ........................................................................................ 62

TABLE 26: THE MODULE POWER SUPPLY RATINGS ................................................................. 62

TABLE 27: THE MODULE CURRENT CONSUMPTION ................................................................. 63

TABLE 28: THE ESD ENDURANCE (TEMPERATURE:25℃,HUMIDITY:45 %) .......................... 64

TABLE 29: DESCRIPTION OF DIFFERENT CODING SCHEMES .................................................. 73

TABLE 30: GPRS MULTI-SLOT CLASSES ....................................................................................... 74

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Figure Index

FIGURE 1: MODULE FUNCTIONAL DIAGRAM ............................................................................. 18

FIGURE 2: PIN ASSIGNMENT ........................................................................................................... 20

FIGURE 3: RIPPLE IN SUPPLY VOLTAGE DURING TRANSMITTING BURST.......................... 27

FIGURE 4: REFERENCE CIRCUIT OF THE VBAT INPUT .............................................................. 28

FIGURE 5: REFERENCE CIRCUIT OF THE SOURCE POWER SUPPLY INPUT .......................... 28

FIGURE 6: TURN ON THE MODULE USING DRIVING CIRCUIT ................................................ 30

FIGURE 7: TURN ON THE MODULE USING KEYSTROKE........................................................... 30

FIGURE 8: TIMING OF TURNING ON SYSTEM .............................................................................. 31

FIGURE 9: TIMING OF TURNING OFF THE MODULE .................................................................. 32

FIGURE 10: REFERENCE CIRCUIT FOR EMERG_OFF BY USING DRIVING CIRCUIT ............ 34

FIGURE 11: REFERENCE CIRCUIT FOR EMERG_OFF BY USING BUTTON ............................. 34

FIGURE 12: TIMING OF RESTARTING SYSTEM ............................................................................ 35

FIGURE 13: TIMING OF RESTARTING SYSTEM AFTER EMERGENCY SHUTDOWN ............. 35

FIGURE 14: RTC SUPPLY FROM NON-CHARGEABLE BATTERY .............................................. 38

FIGURE 15: RTC SUPPLY FROM RECHARGEABLE BATTERY ................................................... 38

FIGURE 16: RTC SUPPLY FROM CAPACITOR ............................................................................... 38

FIGURE 17: SEIKO XH414H-IV01E CHARGE CHARACTERISTICS ............................................. 39

FIGURE 18: CONNECTION OF ALL FUNCTIONAL UART PORT ................................................. 42

FIGURE 19: CONNECTION OF THREE LINES UART PORT .......................................................... 42

FIGURE 20: CONNECTION OF UART PORT ASSOCIATED HARDWARE FLOW CONTROL .. 43

FIGURE 21: CONNECTION OF SOFTWARE UPGRADE ................................................................ 43

FIGURE 22: CONNECTION OF SOFTWARE DEBUG...................................................................... 44

FIGURE 23: 3.3V LEVEL MATCH CIRCUIT ..................................................................................... 45

FIGURE 24: 5V LEVEL MATCH CIRCUIT ........................................................................................ 46

FIGURE 25: RS232 LEVEL MATCH CIRCUIT .................................................................................. 47

FIGURE 26: MICROPHONE INTERFACE DESIGN OF AIN1&AIN2 .............................................. 50

FIGURE 27: RECEIVER INTERFACE DESIGN OF AOUT1 ............................................................. 50

FIGURE 28: EARPHONE INTERFACE DESIGN ............................................................................... 51

FIGURE 29: LOUD SPEAKER INTERFACE DESIGN ...................................................................... 51

FIGURE 30: REFERENCE CIRCUIT OF THE 6 PINS SIM CARD ................................................... 53

FIGURE 31: AMPHENOL C707 10M006 512 2 SIM CARD HOLDER ............................................. 54

FIGURE 32: RI BEHAVIOR OF VOICE CALLING AS A RECEIVER ............................................. 55

FIGURE 33: RI BEHAVIOR OF DATA CALLING AS A RECEIVER .............................................. 56

FIGURE 34: RI BEHAVIOR AS A CALLER ....................................................................................... 56

FIGURE 35: RI BEHAVIOR OF URC OR SMS RECEIVED .............................................................. 56

FIGURE 36: REFERENCE CIRCUIT OF THE NETLIGHT ............................................................... 57

FIGURE 37: REFERENCE CIRCUIT OF THE STATUS .................................................................... 58

FIGURE 38: REFERENCE CIRCUIT OF RF ....................................................................................... 59

FIGURE 39: RF SOLDERING SAMPLE ............................................................................................. 61

FIGURE 40: M35 TOP AND SIDE DIMENSIONS（UNIT: MM） ................................................... 65

FIGURE 41: M35 BOTTOM DIMENSIONS（UNIT: MM） ............................................................. 66

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FIGURE 42: FOOTPRINT ONE OF RECOMMENDATION（UNIT: MM） .................................... 67

FIGURE 43: TOP VIEW OF THE MODULE ....................................................................................... 68

FIGURE 44: BOTTOM VIEW OF THE MODULE .............................................................................. 69

FIGURE 45: PASTE APPLICATION ................................................................................................... 71

FIGURE 46: RAMP-SOAK-SPIKE REFLOW PROFILE .................................................................... 72

FIGURE 47: MODULE TRAY .............................................................................................................. 72

FIGURE 48: RADIO BLOCK STRUCTURE OF CS-1, CS-2 AND CS-3 ........................................... 73

FIGURE 49: RADIO BLOCK STRUCTURE OF CS-4 ........................................................................ 73

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M35 Hardware Design

Revision

Date

Author

Description of change

1.0

2011-12-29

Luka WU

Initial

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0. Revision history

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M35 Hardware Design

SN

Document name

Remark

[1]

M35_ATC

AT commands set

[2]

ITU-T Draft new recommendation V.25ter

Serial asynchronous automatic dialing and control

[3]

GSM 07.07

Digital cellular telecommunications (Phase 2+); AT command set for GSM Mobile Equipment (ME)

[4]

GSM 07.10

Support GSM 07.10 multiplexing protocol

[5]

GSM 07.05

Digital cellular telecommunications (Phase 2+); Use of Data Terminal Equipment – Data Circuit terminating Equipment (DTE – DCE) interface for Short Message Service (SMS) and Cell Broadcast Service (CBS)

[6]

GSM 11.14

Digital cellular telecommunications (Phase 2+); Specification of the SIM Application Toolkit for the Subscriber Identity module – Mobile Equipment (SIM – ME) interface

[7]

GSM 11.11

Digital cellular telecommunications (Phase 2+); Specification of the Subscriber Identity module – Mobile Equipment (SIM – ME) interface

[8]

GSM 03.38

Digital cellular telecommunications (Phase 2+); Alphabets and language-specific information

[9]

GSM 11.10

Digital cellular telecommunications (Phase 2); Mobile Station (MS) conformance specification; Part 1: Conformance specification

[10]

GSM_UART_AN

UART port application notes

[11]

GSM_FW_Upgrade_Tool_ Lite_GS2_UDG

GSM Firmware upgrade tool lite GS2 user guide

[12]

M35_EVB_UGD

M35 EVB user guide

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1. Introduction

This document defines Module M35 and describes its hardware interface which are connected with the customer application and the air interface.

This document can help customers quickly understand the interface specifications, electrical and mechanical details of M35. Associated with application notes and user guide, customers can use M35 to design and set up mobile applications easily.

1.1. Related documents

Table 1: Related documents

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M35 Hardware Design

Abbreviation

Description

ADC

Analog-to-Digital Converter

AMR

Adaptive Multi-Rate

ARP

Antenna Reference Point

ASIC

Application Specific Integrated Circuit

BER

Bit Error Rate

BOM

Bill Of Material

BTS

Base Transceiver Station

CHAP

Challenge Handshake Authentication Protocol

CS

Coding Scheme

CSD

Circuit Switched Data

CTS

Clear To Send

DAC

Digital-to-Analog Converter

DRX

Discontinuous Reception

DSP

Digital Signal Processor

DCE

Data Communications Equipment (typically module)

DTE

Data Terminal Equipment (typically computer, external controller)

DTR

Data Terminal Ready

DTX

Discontinuous Transmission

EFR

Enhanced Full Rate

EGSM

Enhanced GSM

EMC

Electromagnetic Compatibility

ESD

Electrostatic Discharge

ETS

European Telecommunication Standard

FCC

Federal Communications Commission (U.S.)

FDMA

Frequency Division Multiple Access

FR

Full Rate

GMSK

Gaussian Minimum Shift Keying

GPRS

General Packet Radio Service

GSM

Global System for Mobile Communications

HR

Half Rate

I/O

Input/Output

IC

Integrated Circuit

IMEI

International Mobile Equipment Identity

Imax

Maximum Load Current

Inorm

Normal Current

kbps

Kilo Bits Per Second

LED

Light Emitting Diode

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1.2. Terms and abbreviations

Table 2: Terms and abbreviations

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M35 Hardware Design

Li-Ion

Lithium-Ion

Abbreviation

Description

MO

Mobile Originated

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

RF

Radio Frequency

RMS

Root Mean Square (value)

RTC

Real Time Clock

RX

Receive Direction

SIM

Subscriber Identification Module

SMS

Short Message Service

TDMA

Time Division Multiple Access

TE

Terminal Equipment

TX

Transmitting Direction

UART

Universal Asynchronous Receiver & Transmitter

URC

Unsolicited Result Code

USSD

Unstructured Supplementary Service Data

VSWR

Voltage Standing Wave Ratio

Vmax

Maximum Voltage Value

Vnorm

Normal Voltage Value

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

Phonebook abbreviations

FD

SIM Fix Dialing phonebook

LD

SIM Last Dialing phonebook (list of numbers most recently dialed)

MC

Mobile Equipment list of unanswered MT Calls (missed calls)

ON

SIM (or ME) Own Numbers (MSISDNs) list

RC

Mobile Equipment list of Received Calls

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M35 Hardware Design

SM

SIM phonebook

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1.3. Directives and standards

The M35 module is designed to comply with the FCC statements. FCC ID is XMR201202M35. The Host system using M35, should have label indicated FCC ID: XMR201202M35.

1.3.1. FCC Statement

1. This device complies with Part 15 of the FCC rules. Operation is subject to the following

conditions: a) This device may not cause harmful interference. b) This device must accept any interference received, including interference that may cause undesired operation.

2. Changes or modifications not expressly approved by the party responsible for compliance

could void the user’s authority to operate the equipment.

1.3.2. FCC/IC Radiation exposure statement

This equipment complies with FCC/IC 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 portable or Mobile status of this module usage.

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 portable or Mobile status.

1.3.3. Industry Canada licence

Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful.

The host system using M35 should have label indicating “transmitter module IC: 10224-201202M35.

This radio transmitter (identify the device by certification number, or module number if Category II) has been approved by Industry Canada to operate with the antenna type listed below with the

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M35 Hardware Design

Type

Maximum Gain

Impedance

External Antenna

Monopole

2dBi

50Ω

Vehicular antenna

2dBi

50Ω

Internal Antenna

Monopole

2dBi

50Ω

PIFA

2dBi

50Ω

FPC

2dBi

50Ω

PCB

2dBi

50Ω

When in a hospital or other health care facility, observe the restrictions about the use of mobile. Switch the cellular terminal or mobile off. Medical equipment may be sensitive to not operate normally for RF energy interference.

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. Forget to think much of these instructions may lead to the flight safety or offend against local legal action, or both.

Do not operate the cellular terminal or mobile in the presence of flammable gas or fume. Switch off the cellular terminal when you are near petrol station, fuel depot, chemical plant or where blasting operations are in progress. Operation of any electrical equipment in potentially explosive atmosphere can constitute a safety hazard.

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maximum permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device.

The following list of antenna is indicating the maximum permissible antenna gain.

1.4. Safety cautions

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 customer failure to comply with these precautions.

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M35 Hardware Design

Your cellular terminal or mobile receives and transmits radio frequency energy while switched on. RF interference can occur if it is used close to TV set, radio, computer or other electric equipment.

Road safety comes first! Do not use a hand-held cellular terminal or mobile while driving a vehicle, unless it is securely mounted in a holder for hands-free operation. Before making a call with a hand-held terminal or mobile, park the vehicle.

GSM 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.

Some networks do not allow for emergency call if certain network services or phone features are in use (e.g. lock functions, fixed dialing etc.). You may have to deactivate those features before you can make an emergency call.

Also, some networks require that a valid SIM card be properly inserted in cellular terminal or mobile.

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M35 Hardware Design

Feature

Implementation

Power supply

Single supply voltage 3.3V ~ 4.6V Typical supply voltage 4V

Power saving

Typical power consumption in SLEEP mode: 0.9 mA@ DRX=5

0.7 mA@ DRX=9

Frequency bands

 Quad-band: GSM850, GSM900, DCS1800, PCS1900.  The module can search these frequency bands automatically  The frequency bands can be set by AT command.  Compliant with GSM Phase 2/2+

GSM class

Small MS

Transmitting power

 Class 4 (2W) at GSM850 and GSM900  Class 1 (1W) at DCS1800 and PCS1900

GPRS connectivity

 GPRS multi-slot class 12 (default)  GPRS multi-slot class 1~12 (configurable)  GPRS mobile station class B

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2. Product concept

M35 is a Quad-band GSM/GPRS engine that works at frequencies of GSM850MHz, GSM900MHz, DCS1800MHz 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 Appendix A and Appendix B.

With a tiny profile of 19.9mm × 23.6mm × 2.65mm, the module can meet the requirements of almost all M2M applications, including Tracking and Tracing, Industrial PDA, Wireless POS, Intelligent Measurement, Remote Controlling, etc.

M35 is an SMD type module with LCC package, which can be embedded in customer applications. It provides abundant hardware interfaces between the module and customer’s host board.

Designed with power saving technique, the current consumption of M35 module is as low as 0.9 mA in SLEEP mode when DRX is 5.

M35 is integrated with Internet service protocols, which are TCP/IP, UDP, FTP and PPP. Extended AT commands have been developed for customer to use these Internet service protocols easily.

The module fully complies to FCC statements and RoHS directive of the European Union.

2.1. Key features

Table 3: Module key features

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M35 Hardware Design

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

DATA GPRS:

CSD:

 GPRS data downlink transfer: max. 85.6 kbps  GPRS data uplink transfer: max. 85.6 kbps  Coding schemes: 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/HTTP  Support Packet Switched Broadcast Control Channel (PBCCH)  CSD transmission rates: 2.4, 4.8, 9.6, 14.4 kbps non-transparent  Support Unstructured Supplementary Services Data (USSD)

SMS

 Text and PDU mode  SMS storage: SIM card

FAX

Group 3 Class 1 and Class 2

SIM interface

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 Cancellation  Echo Suppression  Noise Reduction  Embedded one amplifier of class AB with maximum driving

power up to 800mW

UART interface

UART Port:

 Seven lines on UART port interface  Use for AT command, GPRS data and CSD data  Multiplexing function  Support autobauding from 4800 bps to 115200 bps

Debug Port:  Two lines on debug UART port interface DBG_TXD and

DBG_RXD

 Debug Port only used for software 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

Implemented

Physical characteristics

Size:

19.9±0.15 × 23.6±0.15 × 2.65±0.2mm Weight: 3g

Firmware upgrade

Firmware upgrade via UART Port

Antenna interface

Connected via 50 Ohm antenna pad

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M35 Hardware Design

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

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Table 4: Coding schemes and maximum net data rates over air interface

2.2. Functional diagram

The following figure shows a block diagram of the M35 module and illustrates the major functional parts:

 Power management  Baseband  The GSM radio frequency part  The Peripheral interface

—SIM interface —Audio interface —UART interface —Power supply —RF interface —Turn on/off interface —RTC interface

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M35 Hardware Design

MT6252D

32.768K

Contro

l

26M

Power supply

UART

SIM

VDD_EXT

AUDIO

PWRKEY

EMERG_OFF

VRTC

RF_ANTENNA

PA

TQM6M4068

Application Interface (42-SMD Pads)

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Figure 1: Module functional diagram

2.3. Evaluation board

In order to help customer 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 [12].

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M35 Hardware Design

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3. Application interface

The module is equipped with 42 pin SMT pad and it adopts LCC package. Detailed descriptions on Sub-interfaces included in these pads are given in the following chapters:

 Power supply  Turn on/off  Power saving  RTC  UART interfaces  Audio interfaces  SIM interface

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M35 Hardware Design

PIN NO.

PIN NAME

I/O PIN NO.

PIN NAME

I/O

1

AGND

2 MIC2P

I 3 MIC2N

I 4 MIC1P

I 5 MIC1N

I 6 SPK1N

O 7 SPK1P

O 8 LOUDSPKN

O 9 LOUDSPKP

O

10

PWRKEY

I

11

EMERG_OFF

I

12

STATUS

O

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3.1. Pin

3.1.1. Pin assignment

Figure 2: Pin assignment

Table 5: M35 pin assignment

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M35 Hardware Design

13

NETLIGHT

O

14

DBG_RXD

I

15

DBG_TXD

O

16

RESERVED

17

RESERVED

18

RESERVED

19

VDD_EXT

O

20

DTR

I

21

RXD

I

22

TXD

O

23

CTS

O

24

RTS

I

25

DCD

O

26

RI

O

27

SIM_VDD

O

28

SIM_RST

O

29

SIM_DATA

I/O

30

SIM_CLK

O

31

SIM_GND

32

VRTC

I/O

33

VBAT

I

34

VBAT

I

35

GND

36

GND

37

GND

38

GND

39

RF_ANT

I/O

40

GND

41

RESERVED

42

RESERVED

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 which 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 supplied.

VImax=VBAT VImin=2.6V VInorm=2.8V VOmax=2.85V VOmin=2.6V VOnorm=2.8V Iout(max)= 730uA Iin=2.6~5 uA

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. Recommended to add a 2.2~4.7uF

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3.1.2. Pin description

Table 6: Pin description

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M35 Hardware Design

bypass capacitor, when using this pin for power supply.

GND

35, 36, 37, 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=VBAT

Pulled up to VBAT internally.

Emergency shutdown

PIN NAME

PIN NO.

I/O DESCRIPTION

DC CHARACTERISTICS

COMMENT

EMERG_ OFF

11 I Emergency off. Pulled down for at least 20ms, which will turn off the module in case of emergency. Use it only when normal shutdown through PWRKEY or AT command cannot perform well.

VILmax=0.4V VIHmin=2.2V V

open

max=2.8V

Open drain/collector driver required in cellular device application. If unused, keep this pin open.

Module indicator

PIN NAME

PIN NO.

I/O DESCRIPTION

DC CHARACTERISTICS

COMMENT

STATUS

12 O Indicate module operating status. High level indicates module is power-on and low level indicates power-down.

VOHmin=

0.85*VDD_EXT VOLmax=

0.15*VDD_EXT

If unused, keep this pin open.

Audio interface

PIN NAME

PIN NO.

I/O DESCRIPTION

DC CHARACTERISTICS

COMMENT

MIC1P MIC1N

4， 5

I

Channel one of positive and negative

If unused, keep these pins open.

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M35 Hardware Design

voice-band input

MIC2P MIC2N

2， 3

I

Channel two of positive and negative voice-band input

SPK1N SPK1P

6, 7

O

Channel one of positive and negative voice-band output

If unused, keep these pins open.

AGND

1 Cooperate with LOUDSPKP

If unused, keep this pin open.

LOUDSPKN

LOUDSPKP

8，9

O

Channel two of positive and negative voice-band output

1. If unused, keep these pins open.

2. Embedded amplifier of class AB internally.

3. Support both Voice and ring.

Net status indicator

PIN NAME

PIN NO.

I/O DESCRIPTION

DC CHARACTERISTICS

COMMENT

NETLIGHT

13 O Network status indication

VOHmin=

0.85*VDD_EXT VOLmax=

0.15*VDD_EXT

If unused, keep this pin open.

Main UART port

PIN NAME

PIN NO.

I/O DESCRIPTION

DC CHARACTERISTICS

COMMENT

DTR

20 I Data terminal ready

VILmin=-0.3V VILmax=

0.25*VDD_EXT

VIHmin=

0.75*VDD_EXT

VIHmax=

VDD_EXT+0.3V

VOHmin=

0.85*VDD_EXT

VOLmax=

0.15*VDD_EXT

If only use TXD, RXD and GND to communicate, recommended keeping other pins open, except RTS. Pull down RTS.

RXD

21 I Receiving data

TXD

22 O Transmitting data

CTS

23 O Clear to send

RTS

24 I Request to send

DCD

25 O Data carrier detection

RI

26 O Ring indicator

Debug UART port

PIN NAME

PIN NO.

I/O DESCRIPTION

DC CHARACTERISTICS

COMMENT

Quectel

Confidential

M35_HD_V1.0 - 23 -

Quectel Wireless Solutions 201202M35 Users Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

Table Index

Figure Index

0. Revision history

1. Introduction

1.1. Related documents

1.2. Terms and abbreviations

1.3. Directives and standards

1.3.1. FCC Statement

1.3.2. FCC/IC Radiation exposure statement

1.3.3. Industry Canada licence

1.4. Safety cautions

2. Product concept

2.1. Key features

2.2. Functional diagram

2.3. Evaluation board

3. Application interface

3.1. Pin

3.1.1. Pin assignment

3.1.2. Pin description