Quectel Wireless Solutions 201511M85 User Manual

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M85 Hardware Design

GSM/GPRS Module Series

Rev. M85_Hardware_Design_V3.0

Date: 2015-10-22

www.quectel.com

GSM/GPRS Module Series

M85 Hardware Design

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: +86 21 5108 6236

Mail: info@quectel.com

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

Or Email: Support@quectel.com

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.

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About the Document

History

 

Revision

 

 

Date

 

Author

 

 

Description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.0

 

2012-07-15

 

Winter CHEN

Initial

 

 

 

 

 

 

1.1

 

2013-11-04

 

Felix YIN

Optimized the parameters of VBAT ripple in Table 33

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.

Updated module key features in Table 1

 

 

 

 

 

 

 

 

2.

Modified pin assignment in Figure 2

 

 

 

 

 

 

 

 

3.

Updated DC characteristics of module’s pins in

 

 

 

 

 

 

 

 

 

 

Table 4

 

 

 

 

 

 

 

 

4.

Updated reference circuit for power supply in

3.0

 

2015-03-13

 

Stone YU/

 

 

Figure 5

 

 

Hollis WANG

5.

Modified over-voltage or under-voltage automatic

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

shutdown in Section 3.4.2.3

 

 

 

 

 

 

 

 

6.

Modified RTC backup in Section 3.6

 

 

 

 

 

 

 

 

7.

Modified UART application in Section 3.7.4

 

 

 

 

 

 

 

 

8.

Deleted the data call mode in Section 3.13

 

 

 

 

 

 

 

 

9.

Added antenna requirement in Section 4.5

 

 

 

 

 

 

 

 

 

 

 

 

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Contents

About the Document...................................................................................................................................

 

2

Contents .......................................................................................................................................................

 

 

3

Table Index...................................................................................................................................................

 

 

6

Figure Index .................................................................................................................................................

 

 

7

1

Introduction

..........................................................................................................................................

 

9

 

1.1.

Safety Information .................................................................................................................

10

2

Product Concept ................................................................................................................................

 

11

 

2.1.

General Description...............................................................................................................

11

 

2.2.

Directives and Standards ......................................................................................................

11

 

 

2.2.1.

FCC Statement...............................................................................................................

11

 

 

2.2.2.

FCC Radiation Exposure Statement..............................................................................

12

 

2.3.

Key Features

.........................................................................................................................

12

 

2.4.

Functional Diagram ...............................................................................................................

14

 

2.5.

Evaluation Board ...................................................................................................................

15

3

Application Interface

.........................................................................................................................

16

 

3.1.

Pin of Module.........................................................................................................................

17

 

 

3.1.1.

Pin Assignment ..............................................................................................................

17

 

 

3.1.2.

Pin Description ...............................................................................................................

18

 

3.2.

Operating Modes ...................................................................................................................

23

 

3.3.

Power Supply ........................................................................................................................

24

 

 

3.3.1. Power Features of Module.............................................................................................

24

 

 

3.3.2. Decrease Supply Voltage Drop......................................................................................

24

 

 

3.3.3. Reference Design For Power Supply ............................................................................

25

 

 

3.3.4.

Monitor Power Supply ....................................................................................................

26

 

3.4.

Power On and Down Scenarios ............................................................................................

26

 

 

3.4.1.

Power On .......................................................................................................................

26

 

 

3.4.2.

Power Down ...................................................................................................................

28

 

 

3.4.2.1.

Power Down Module Using the PWRKEY Pin ................................................

28

 

 

3.4.2.2.

Power Down Module Using AT Command ......................................................

29

 

 

3.4.2.3.

Over-voltage or Under-voltage Automatic Shutdown......................................

29

 

 

3.4.2.4.

Emergency Shutdown Using EMERG_OFF Pin .............................................

30

 

 

3.4.3.

Restart ............................................................................................................................

 

31

 

3.5.

Power Saving ........................................................................................................................

32

 

 

3.5.1.

Minimum Functionality Mode .........................................................................................

32

 

 

3.5.2.

SLEEP Mode..................................................................................................................

33

 

 

3.5.3. Wake up Module from SLEEP Mode .............................................................................

33

 

 

3.5.4.

Summary of State Transition..........................................................................................

33

 

3.6.

RTC Backup ..........................................................................................................................

 

34

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3.7.

 

Serial Interfaces.....................................................................................................................

36

 

3.7.1.

UART Port ......................................................................................................................

38

 

 

 

3.7.1.1.

The Features of UART Port .............................................................................

38

 

 

 

3.7.1.2.

The Connection of UART Port .........................................................................

39

 

 

 

3.7.1.3.

Firmware Upgrade ...........................................................................................

40

 

3.7.2.

Debug Port .....................................................................................................................

41

 

3.7.3.

Auxiliary UART Port .......................................................................................................

42

 

3.7.4.

UART Application ...........................................................................................................

42

 

3.8.

 

Audio Interfaces.....................................................................................................................

44

 

 

3.8.1. Decrease TDD Noise and Other Noise..........................................................................

45

 

3.8.2.

Microphone Interfaces Design .......................................................................................

46

 

 

3.8.3. Receiver and Speaker Interface Design ........................................................................

46

 

3.8.4.

Earphone Interface Design ............................................................................................

48

 

 

3.8.5. Loud Speaker Interface Design......................................................................................

49

 

3.8.6.

Audio Characteristics .....................................................................................................

49

 

3.9.

 

SIM Card Interfaces ..............................................................................................................

50

 

3.10.

SD Card Interface..................................................................................................................

53

 

3.11.

PCM Interface........................................................................................................................

55

 

3.11.1.

Configuration ..................................................................................................................

56

 

3.11.2.

Timing

.............................................................................................................................

56

 

3.11.3.

Reference Design ..........................................................................................................

58

 

3.11.4.

AT Command .................................................................................................................

58

 

3.12.

ADC .......................................................................................................................................

 

59

 

3.13.

Behaviors Of ..............................................................................................................The RI

60

 

3.14.

Network Status ......................................................................................................Indication

62

 

3.15.

Operating Status ...................................................................................................Indication

62

4

Antenna Interface...............................................................................................................................

 

64

 

4.1.

 

Reference Design..................................................................................................................

64

 

4.2.

 

RF Output Power...................................................................................................................

65

 

4.3.

 

RF Receiving ........................................................................................................Sensitivity

65

 

4.4.

 

Operating Frequencies..........................................................................................................

66

 

4.5.

 

Antenna Requirement ...........................................................................................................

66

 

4.6.

 

RF Cable Soldering ...............................................................................................................

67

5 Electrical, Reliability ............................................................................and Radio Characteristics

68

 

5.1.

 

Absolute Maximum ...................................................................................................Ratings

68

 

5.2.

 

Operating Temperature .........................................................................................................

69

 

5.3.

 

Power Supply ...........................................................................................................Ratings

69

 

5.4.

 

Current Consumption ............................................................................................................

70

 

5.5.

 

Electro-static ........................................................................................................Discharge

72

6

Mechanical Dimensions ....................................................................................................................

74

 

6.1.

 

Mechanical .......................................................................................Dimensions of Module

74

 

6.2.

 

Recommended .......................................................................................................Footprint

76

 

6.3.

 

Top View of .........................................................................................................the Module

77

 

 

 

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6.4.

Bottom View of the Module ...................................................................................................

77

7

Storage and Manufacturing ..............................................................................................................

78

 

7.1.

Storage ..................................................................................................................................

78

 

7.2.

Soldering ...............................................................................................................................

79

 

7.3.

Packaging..............................................................................................................................

80

8

Appendix A Reference.......................................................................................................................

82

9

Appendix B GPRS Coding Scheme .................................................................................................

87

10

Appendix C GPRS Multi-slot Class..................................................................................................

89

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Table Index

 

TABLE 1: MODULE KEY FEATURES ...............................................................................................................

12

TABLE 2: CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE ........................

14

TABLE 3: PIN DESCRIPTION ...........................................................................................................................

18

TABLE 4: OVERVIEW OF OPERATING MODES .............................................................................................

23

TABLE 5: SUMMARY OF STATE TRANSITION ...............................................................................................

33

TABLE 6: LOGIC LEVELS OF THE UART INTERFACE ..................................................................................

37

TABLE 7: PIN DEFINITION OF THE UART INTERFACES ..............................................................................

37

TABLE 8: PIN DEFINITION OF AUDIO INTERFACE .......................................................................................

44

TABLE 9: AOUT3 OUTPUT CHARACTERISTICS............................................................................................

45

TABLE 10: TYPICAL ELECTRET MICROPHONE CHARACTERISTICS.........................................................

49

TABLE 11: TYPICAL SPEAKER CHARACTERISTICS.....................................................................................

49

TABLE 12: PIN DEFINITION OF THE SIM INTERFACE ..................................................................................

50

TABLE 13: PIN DEFINITION OF THE SD CARD INTERFACE ........................................................................

54

TABLE 14: PIN DEFINITION OF THE SD CARD INTERFACE ........................................................................

54

TABLE 15: PIN DEFINITION OF PCM INTERFACE.........................................................................................

55

TABLE 16: CONFIGURATION...........................................................................................................................

56

TABLE 17: QPCMON COMMAND DESCRIPTION ..........................................................................................

59

TABLE 18: QPCMVOL COMMAND DESCRIPTION.........................................................................................

59

TABLE 19: PIN DEFINITION OF THE ADC ......................................................................................................

60

TABLE 20: CHARACTERISTICS OF THE ADC................................................................................................

60

TABLE 21: BEHAVIORS OF THE RI .................................................................................................................

60

TABLE 22: WORKING STATE OF THE NETLIGHT..........................................................................................

62

TABLE 23: PIN DEFINITION OF THE STATUS ................................................................................................

63

TABLE 24: PIN DEFINITION OF THE RF_ANT ................................................................................................

64

TABLE 25: THE MODULE CONDUCTED RF OUTPUT POWER ....................................................................

65

TABLE 26: THE MODULE CONDUCTED RF RECEIVING SENSITIVITY .......................................................

65

TABLE 27: THE MODULE OPERATING FREQUENCIES................................................................................

66

TABLE 28: ANTENNA CABLE REQUIREMENTS.............................................................................................

66

TABLE 29: ANTENNA REQUIREMENTS..........................................................................................................

66

TABLE 30: ABSOLUTE MAXIMUM RATINGS ..................................................................................................

68

TABLE 31: OPERATING TEMPERATURE........................................................................................................

69

TABLE 32: THE MODULE POWER SUPPLY RATINGS ..................................................................................

69

TABLE 33: THE MODULE CURRENT CONSUMPTION ..................................................................................

70

TABLE 34: THE ESD ENDURANCE (TEMPERATURE: 25ºC, HUMIDITY: 45%) ............................................

73

TABLE 35: REEL PACKING ..............................................................................................................................

81

TABLE 36: RELATED DOCUMENTS ................................................................................................................

82

TABLE 37: TERMS AND ABBREVIATIONS ......................................................................................................

83

TABLE 38: DESCRIPTION OF DIFFERENT CODING SCHEMES ..................................................................

87

TABLE 39: GPRS MULTI-SLOT CLASSES ......................................................................................................

89

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Figure Index

 

 

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

15

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

 

17

FIGURE 3: VOLTAGE RIPPLE DURING TRANSMITTING ..............................................................................

24

FIGURE 4: REFERENCE CIRCUIT FOR THE VBAT INPUT ...........................................................................

25

FIGURE 5: REFERENCE CIRCUIT FOR POWER SUPPLY ............................................................................

25

FIGURE 6: TURN ON THE MODULE WITH AN OPEN-COLLECTOR DRIVER..............................................

26

FIGURE 7: TURN ON THE MODULE WITH A BUTTON ..................................................................................

27

FIGURE 8: TURN-ON TIMING ..........................................................................................................................

 

27

FIGURE 9: TURN-OFF TIMING ........................................................................................................................

 

28

FIGURE 10: AN OPEN-COLLECTOR DRIVER FOR EMERG_OFF ................................................................

30

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

31

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

31

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

32

FIGURE 14: VRTC IS SUPPLIED BY A NON-CHARGEABLE BATTERY........................................................

35

FIGURE 15: VRTC IS SUPPLIED BY A RECHARGEABLE BATTERY ............................................................

35

FIGURE 16: VRTC IS SUPPLIED BY A CAPACITOR ......................................................................................

36

FIGURE 17: REFERENCE DESIGN FOR FULL-FUNCTION UART................................................................

39

FIGURE 18: REFERENCE DESIGN FOR UART PORT...................................................................................

40

FIGURE 19: REFERENCE DESIGN FOR UART PORT WITH HARDWARE FLOW CONTROL ....................

40

FIGURE 20: REFERENCE DESIGN FOR FIRMWARE UPGRADE.................................................................

41

FIGURE 21: REFERENCE DESIGN FOR DEBUG PORT ...............................................................................

41

FIGURE 22: REFERENCE DESIGN FOR AUXILIARY UART PORT ...............................................................

42

FIGURE 23: LEVEL MATCH DESIGN FOR 3.3V SYSTEM..............................................................................

42

FIGURE 24: SKETCH MAP FOR RS-232 INTERFACE MATCH......................................................................

43

FIGURE 25: REFERENCE DESIGN FOR AIN1&AIN2 .....................................................................................

46

FIGURE 26: HANDSET INTERFACE DESIGN FOR AOUT1 ...........................................................................

46

FIGURE 27: SPEAKER INTERFACE DESIGN WITH AN AMPLIFIER FOR AOUT1 .......................................

47

FIGURE 28: HANDSET INTERFACE DESIGN FOR AOUT2 ...........................................................................

47

FIGURE 29: SPEAKER INTERFACE DESIGN WITH AN AMPLIFIER FOR AOUT2 .......................................

48

FIGURE 30: EARPHONE INTERFACE DESIGN..............................................................................................

48

FIGURE 31: LOUD SPEAKER INTERFACE DESIGN......................................................................................

49

FIGURE 32: REFERENCE CIRCUIT FOR SIM1 INTERFACE WITH 8-PIN SIM CARD HOLDER .................

51

FIGURE 33: REFERENCE CIRCUIT FOR SIM1 INTERFACE WITH THE 6-PIN SIM CARD HOLDER .........

52

FIGURE 34: REFERENCE CIRCUIT FOR SIM2 INTERFACE WITH THE 6-PIN SIM CARD HOLDER .........

52

FIGURE 35: REFERENCE CIRCUIT FOR SD CARD ......................................................................................

54

FIGURE 36: LONG SYNCHRONIZATION & SIGN EXTENSION DIAGRAM ...................................................

57

FIGURE 37: LONG SYNCHRONIZATION & ZERO PADDING DIAGRAM.......................................................

57

FIGURE 38: SHORT SYNCHRONIZATION & SIGN EXTENSION DIAGRAM.................................................

57

FIGURE 39: SHORT SYNCHRONIZATION & ZERO PADDING DIAGRAM ....................................................

58

FIGURE 40: REFERENCE DESIGN FOR PCM ...............................................................................................

58

FIGURE 41: RI BEHAVIOR OF VOICE CALLING AS A RECEIVER ................................................................

61

FIGURE 42: RI BEHAVIOR AS A CALLER .......................................................................................................

 

61

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FIGURE 43: RI BEHAVIOR OF URC OR SMS RECEIVED .............................................................................

61

FIGURE 44: REFERENCE DESIGN FOR NETLIGHT .....................................................................................

62

FIGURE 45: REFERENCE DESIGN FOR STATUS..........................................................................................

63

FIGURE 46: REFERENCE DESIGN FOR RF ..................................................................................................

64

FIGURE 47: RF SOLDERING SAMPLE ...........................................................................................................

67

FIGURE 48: M85 MODULE TOP AND SIDE DIMENSIONS (UNIT: MM) .........................................................

74

FIGURE 49: M85 MODULE BOTTOM DIMENSIONS (UNIT: MM)...................................................................

75

FIGURE 50: THE PAD DIMENSIONS (UNIT: MM) ...........................................................................................

75

FIGURE 51: RECOMMENDED FOOTPRINT (UNIT: MM)................................................................................

76

FIGURE 52: TOP VIEW OF THE MODULE ......................................................................................................

77

FIGURE 53: BOTTOM VIEW OF THE MODULE..............................................................................................

77

FIGURE 54: RAMP-SOAK-SPIKE REFLOW PROFILE....................................................................................

79

FIGURE 55: TAPE AND REEL INFORMATION ................................................................................................

81

FIGURE 56: RADIO BLOCK STRUCTURE OF CS-1, CS-2 AND CS-3...........................................................

87

FIGURE 57: RADIO BLOCK STRUCTURE OF CS-4.......................................................................................

88

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1 Introduction

This document defines the M85 module and describes its hardware interface which are connected with the customer 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 M85 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 M85 module. Manufacturers of the cellular terminal should send the following safety information to users and operating personnel and to incorporate these guidelines into all manuals supplied with the product. If not so, Quectel does not take on any liability for customer failure to comply with these precautions.

Full attention must be given to driving at all times in order to reduce the risk of an accident. Using a 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

M85 is a Quad-band GSM/GPRS engine that works at frequencies of GSM850MHz, EGSM900MHz, DCS1800MHz and PCS1900MHz. The M85 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 24.5mm × 25.3mm × 2.6mm, 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.

M85 is an SMD type module with LCC package, which can be easily embedded into applications. It provides abundant hardware interfaces like PCM and SD Card Interface.

Designed with power saving technique, the current consumption of M85 is as low as 1.3 mA in SLEEP mode when DRX is 5.

M85 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 M85 module is designed to comply with the FCC statements. FCC ID: XMR201511M85

The Host system using M85 should have label ―contains FCC ID: XMR201511M85‖.

2.2.1. FCC Statement

Changes or modifications not expressly approved by the party responsible for compliance could void the

user’s authority to operate the equipment.

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2.2.2. 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 module usage. This module should NOT be installed and operating simultaneously with other radio. The manual of the host system, which uses M85, must include RF exposure warning statement to advice user should keep minimum 20cm from the radio antenna of M85 module depending on the Mobile status. Note: If a portable device (such as PDA) uses M85 module, the device needs to do permissive change and SAR testing.

The following list indicates the performance of antenna gain in certificate testing.

Part

Frequency Range (MHz)

Peak Gain

Average

VS

Impedanc

Number

(XZ-V)

Gain(XZ-V)

WR

e

 

 

 

 

 

 

 

 

GSM850:824 894MHz

 

 

 

 

3R007

EGSM900:880 960MHz

1 dBi typ.

1 dBi typ.

2 max

50Ω

DCS1800:1710 1880MHz

 

 

 

 

 

 

PCS1900: 1850 1990MHz

 

 

 

 

2.3. Key Features

The following table describes the detailed features of M85 module.

Table 1: Module Key Features

 

 

Feature

 

Implementation

 

 

 

 

 

 

 

 

 

 

 

Power Supply

 

Single supply voltage: 3.3V~4.6V

 

 

 

 

 

Typical supply voltage: 4.0V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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GPRS multi-slot class 12 (default)

 

GPRS Connectivity

GPRS multi-slot class 1~12 (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:

 

 

 

 

Seven lines on UART port interface

 

 

 

 

Used for AT command, GPRS data

 

 

 

 

Multiplexing function

 

UART Interfaces

Support autobauding from 4800bps to 115200bps

 

Debug Port:

 

 

 

 

 

 

 

 

Two lines on debug port interface DBG_TXD and DBG_RXD

 

 

 

 

Use for software debugging and log output

 

 

 

 

Auxiliary Port:

 

 

 

 

Used for AT command

 

 

Phonebook Management

Support phonebook types: SM, ME, ON, MC, RC, DC, LD, LA

 

 

 

 

 

SIM Application Toolkit

Support SAT class 3, GSM 11.14 Release 99

 

 

 

 

 

Real Time Clock

Supported

 

 

 

 

 

 

 

M85_Hardware_Design

Confidential / Released

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GSM/GPRS Module Series

 

 

 

 

M85 Hardware Design

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Physical Characteristics

Size: 25.3±0.15 × 24.5±0.15 × 2.6±0.2mm

 

Weight: Approx. 3.3g

 

 

 

 

 

 

 

 

 

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 M85 and illustrates the major functional parts.

Radio frequency part

Serial Flash

Power management

The Peripheral interface

—Power supply

—Turn-on/off interface

—UART interfaces

—Audio interfaces

—SIM interfaces

—SD interface

—PCM interface

—ADC interface

—RTC interface

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GSM/GPRS Module Series

M85 Hardware Design

—RF interface

RF_ANT

 

 

 

 

 

 

ESD

RF

PAM

 

 

 

 

 

 

VBAT

 

 

 

 

 

PWRKEY

PMU

RF Transceiver

26MHz

 

 

 

 

 

EMERG_OFF

Reset

 

 

 

 

VRTC

RTC

 

 

ADC

ADC

 

 

 

 

SIM Interfaces

SIM

BB&RF

PCM

PCM

 

Interface

 

 

Interface

 

 

 

 

GPIO&

 

 

 

SD

SD

Status&

GPIO&PWM

 

 

 

 

Interface

 

Netlight

 

 

 

 

 

 

 

 

 

UART

Serial Interface

MEMORY

Audio

Audio

 

 

Serial Flash

 

 

Figure 1: Module Functional Diagram

2.5. Evaluation Board

In order to help customer to develop applications with M85, 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].

M85_Hardware_Design

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GSM/GPRS Module Series

M85 Hardware Design

3 Application Interface

The module adopts LCC package and has 83 pins. The following chapters provide detailed descriptions about these pins below.

Power supply

Power on/down

Power saving

RTC

Serial interfaces

Audio interfaces

SIM interfaces

SD interface

PCM interface

ADC

RI

NETLIGHT

Status

M85_Hardware_Design

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Quectel Wireless Solutions 201511M85 User Manual

GSM/GPRS Module Series

M85 Hardware Design

3.1. Pin of Module

3.1.1. Pin Assignment

 

 

SIM2 RST

 

SIM2 DATA

 

SIM2 CLK

SIM2 VDD

 

VBAT

 

VBAT

 

VBAT

 

VBAT

 

GND

 

GND

 

GND

RF ANT

 

GND

GND

 

VDD EXT

VRTC

 

RESERVED

 

SIM1 PRESENCE

74

73

72

71

70

69

68

67

66 65

64

63

62

61

60

59

58

57

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RESERVED 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ADC0 2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RESERVED 3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Top view

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NETLIGHT 4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SPK2P 5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AGND 6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MIC2P 7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RESERVED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MIC2N 8

 

 

 

 

 

 

 

 

 

 

 

 

RESERVED 75

 

 

82

 

 

 

81 GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MIC1P 9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MIC1N 10

 

 

 

 

 

 

 

 

 

 

 

 

RESERVED 76

 

 

83

 

 

 

80 GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SPK1N 11

 

 

 

 

 

 

 

 

 

 

 

 

RESERVED 77

 

 

78

 

 

 

79 GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SPK1P 12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LOUDSPKN 13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RESERVED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LOUDSPKP 14

PWRKEY 15

STATUS 16

EMERG_OFF 17

PCM_IN 18

PCM_CLK 19

20

21

22

23

24

25

26

27 28

29 30

31

32

33

34

 

35

36

37

 

PCM OUT

PCM SYNC

RESERVED

RESERVED

RESERVED

RESERVED

RESERVED

RESERVED

RESERVED

RESERVED

RESERVED

RESERVED

RESERVED

RESERVED

SD CMD

SD CLK

SD DATA0

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VBAT

 

SIM2

 

 

GND

 

RF

 

 

 

UART

 

Audio

 

ADC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power

 

 

 

 

 

 

Other

 

 

 

 

 

 

 

 

SIM1

RESERVED

SD

 

 

 

 

PCM

 

 

 

 

Figure 2: Pin Assignment

NOTE

56 SIM1_VDD

55 SIM1_CLK

54 SIM1_DATA

53 SIM1_RST

52 SIM_GND

51 RTS

50 RXD

49 TXD

48 CTS

47 DTR

46 RI

45 DCD

44 RESERVED

43 DBG_RXD

42 DBG_TXD

41 RXD_AUX

40 TXD_AUX

39 RESERVED

38 RESERVED

Keep all reserved pins open.

 

 

 

 

 

 

 

 

 

 

 

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GSM/GPRS Module Series

M85 Hardware Design

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

 

 

 

67, 68, 69,

 

current in a

 

 

VBAT

I

module:

Vmin=3.3V

 

 

70

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

 

 

 

 

 

 

 

VInorm=2.8V

 

 

 

 

 

 

 

Charging for backup

 

 

 

 

 

 

 

VOmax=3V

If unused, keep

 

 

VRTC

59

I/O

battery or golden

 

 

VOmin=2V

this pin open.

 

 

 

 

 

capacitor when the

 

 

 

 

 

VOnorm=2.8V

 

 

 

 

 

 

 

VBAT is applied.

 

 

 

 

 

 

 

Iout(max)=2mA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Iin≈10uA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1. If unused, keep

 

 

 

 

 

 

 

this pin open.

 

 

 

 

 

 

Vmax=2.9V

2. Recommend to

 

 

VDD_EXT

60

O

Supply 2.8V voltage for

Vmin=2.7V

add a 2.2~4.7uF

 

 

external circuit.

Vnorm=2.8V

bypass capacitor,

 

 

 

 

 

 

 

 

 

 

 

Imax=20mA

when using this

 

 

 

 

 

 

 

pin for power

 

 

 

 

 

 

 

supply.

 

 

 

 

 

 

 

 

 

 

 

 

37, 61, 62,

 

 

 

 

 

 

 

GND

64~66,

 

Ground

 

 

 

 

 

 

79~82,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

15

I

VIHmin=

 

 

 

 

down for a moment to turn

 

 

 

 

 

 

 

0.6×VBAT

 

 

 

 

 

 

 

on or turn off the system.

 

 

 

 

 

 

 

VIHmax=3.1V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Emergency Shutdown

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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GSM/GPRS Module Series

 

 

 

 

 

 

 

 

M85 Hardware Design

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

17

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

16

O

high level when module

0.85×VDD_EXT

If unused, keep

 

 

turns on, while output low

VOLmax=

this pin open.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

level when module turns

0.15×VDD_EXT

 

 

 

 

 

 

 

 

 

off.

 

 

 

 

 

 

 

 

 

 

 

 

 

Audio Interface

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PIN NAME

PIN NO.

I/O

DESCRIPTION

DC

COMMENT

 

 

CHARACTERISTICS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MIC1P

9, 10

I

Channel 1 positive and

 

 

 

 

 

MIC1N

negative voice input

 

If unused, keep

 

 

 

 

 

 

 

 

 

 

 

 

 

 

these pins open.

 

 

MIC2P

7, 8

I

Channel 2 positive and

 

 

 

MIC2N

negative voice input

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SPK1P

12, 11

O

Channel 1 positive and

 

1. If unused, keep

 

 

SPK1N

negative voice output

 

these pins open.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2. Support both

 

 

 

 

 

 

 

 

 

 

 

SPK2P

5

 

O

Channel 2 voice output

 

voice and

 

 

 

 

 

 

 

 

 

ringtone output.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Analog ground. Separate

 

If unused, keep

 

 

AGND

6

 

 

ground connection for

Refer to Section 3.8

 

 

 

 

this pin open.

 

 

 

 

 

 

 

external audio circuits.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1. If unused, keep

 

 

 

 

 

 

 

 

 

these pins open.

 

 

 

 

 

 

 

 

 

2. Integrate a

 

 

LOUDSPKN

13, 14

O

Channel 3 positive and

 

ClassAB

 

 

LOUDSPKP

negative voice output

 

amplifier

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

internally.

 

 

 

 

 

 

 

 

 

3. Support both

 

 

 

 

 

 

 

 

 

voice and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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M85 Hardware Design

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ringtone output.

 

 

 

 

 

 

 

 

 

 

 

Network Status Indicator

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PIN NAME

PIN NO.

I/O

DESCRIPTION

DC

COMMENT

 

 

CHARACTERISTICS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VOHmin=

 

 

 

 

NETLIGHT

4

 

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

47

I

Data terminal ready

VILmin=0V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VILmax=

If only use TXD,

 

 

RXD

50

I

Receive data

 

 

0.25×VDD_EXT

RXD and GND to

 

 

 

 

 

 

 

 

 

 

 

TXD

49

O

Transmit data

VIHmin=

communicate,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.75×VDD_EXT

recommended

 

 

 

 

 

 

 

 

 

 

 

RTS

51

I

Request to send

VIHmax=

connecting RTS

 

 

 

 

 

 

 

 

 

VDD_EXT+0.2

to GND via 0R

 

 

CTS

48

O

Clear to send

 

 

VOHmin=

resistor and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.85×VDD_EXT

keeping other

 

 

RI

46

O

Ring indication

 

 

VOLmax=

pins open.

 

 

 

 

 

 

 

 

 

 

 

DCD

45

O

Data carrier detection

0.15×VDD_EXT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Debug Port

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PIN NAME

PIN NO.

I/O

DESCRIPTION

DC

COMMENT

 

 

CHARACTERISTICS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DBG_TXD

42

O

Transmit data

 

If unused, keep

 

 

 

 

 

 

 

 

 

Same as above

 

 

 

 

 

 

 

 

 

these pins open.

 

 

DBG_RXD

43

I

Receive data

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Auxiliary Port

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PIN NAME

PIN NO.

I/O

DESCRIPTION

DC

COMMENT

 

 

CHARACTERISTICS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TXD_AUX

40

O

Transmit data

 

If unused, keep

 

 

 

 

 

 

 

 

 

Same as above

 

 

 

 

 

 

 

 

 

these pins open.

 

 

RXD_AUX

41

I

Receive data

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SIM Interface

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PIN NAME

PIN NO.

I/O

DESCRIPTION

DC

COMMENT

 

 

CHARACTERISTICS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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M85 Hardware Design

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SIM1_VDD

56

 

 

The voltage can be

 

 

 

 

 

Power supply for SIM

selected by software

 

 

 

 

 

 

 

 

O

 

 

 

 

 

 

 

 

card

automatically. Either

 

 

 

 

SIM2_VDD

71

 

 

 

 

 

 

 

1.8V or 3V.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SIM1_CLK

55

 

 

VOLmax=

All signals of SIM

 

 

 

 

 

 

 

 

0.15×SIM_VDD

 

 

 

 

 

 

O

SIM clock

interface should be

 

 

 

 

 

 

VOHmin=

 

 

 

 

 

 

 

 

protected against

 

 

SIM2_CLK

72

 

 

0.85×SIM_VDD

 

 

 

 

 

 

 

 

ESD with a TVS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VILmax=

diode array.

 

 

 

 

 

 

 

 

0.25×SIM_VDD

Maximum trace

 

 

SIM1_ DATA

54

 

 

VIHmin=

 

 

 

 

length is 200mm

 

 

 

 

 

 

 

 

0.75×SIM_VDD

 

 

 

 

 

 

I/O

SIM data

from the module

 

 

 

 

 

 

VOLmax=

 

 

 

 

 

 

 

 

0.15×SIM_VDD

pad to SIM card

 

 

SIM2_DATA

73

 

 

VOHmin=

holder.

 

 

 

 

 

 

 

 

0.85×SIM_VDD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SIM1_RST

53

 

 

VOLmax=

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

O

SIM reset

0.15×SIM_VDD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VOHmin=

 

 

 

 

SIM2_RST

74

 

 

 

 

 

 

 

 

0.85×SIM_VDD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VILmin=0V

 

 

 

 

 

 

 

 

 

 

VILmax=

 

 

 

 

SIM1_

 

 

 

 

0.25×VDD_EXT

If unused, keep

 

 

57

I

SIM card detection

VIHmin=

 

 

PRESENCE

these pins open.

 

 

 

 

 

 

0.75×VDD_EXT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VIHmax=

 

 

 

 

 

 

 

 

 

 

VDD_EXT+0.2

 

 

 

 

 

 

 

 

 

 

 

 

 

SIM_GND

52

 

SIM ground

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ADC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PIN NAME

PIN NO.

I/O

DESCRIPTION

DC

COMMENT

 

 

CHARACTERISTICS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

General purpose

Voltage range:

If unused, keep

 

 

ADC0

2

 

I

analog to digital

 

 

 

0V to 2.8V

this pin open.

 

 

 

 

 

 

 

converter.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PCM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PIN NAME

PIN NO.

I/O

DESCRIPTION

DC

COMMENT

 

 

CHARACTERISTICS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PCM_CLK

19

O

PCM clock

 

 

 

 

 

 

 

 

 

 

 

VILmin= 0V

If unused, keep

 

 

 

 

 

 

 

 

 

 

PCM_IN

18

I

PCM data input

VILmax=

these pins open.

 

 

 

 

 

0.25×VDD_EXT

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VIHmin=

 

 

PCM_OUT

20

O

PCM data output

0.75×VDD_EXT

 

 

 

 

 

 

 

 

 

 

 

 

VIHmax=

 

 

 

 

 

 

VDD_EXT+0.2

If unused, keep

 

 

 

 

PCM frame

VOHmin=

these pins open.

 

PCM_SYNC

21

O

0.85×VDD_EXT

 

 

synchronization

 

 

 

 

 

VOLmax=

 

 

 

 

 

 

 

 

 

 

 

 

0.15×VDD_EXT

 

 

 

 

 

 

 

 

 

SD Card

 

 

 

 

 

 

 

 

 

 

 

 

 

PIN NAME

PIN NO.

I/O

DESCRIPTION

DC

COMMENT

 

CHARACTERISTICS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VILmin=0V

 

 

SD_CMD

34

O

SD command

VILmax=

 

 

 

 

 

 

 

 

 

0.25×VDD_EXT

 

 

 

 

 

 

VIHmin=

 

 

 

 

 

 

 

 

 

 

 

 

0.75×VDD_EXT

If unused, keep

 

SD_CLK

35

O

SD clock

VIHmax=

 

these pins open.

 

 

 

 

 

VDD_EXT+0.2

 

 

 

 

 

 

 

 

 

 

 

VOHmin=

 

 

 

 

 

 

 

 

 

 

 

 

0.85×VDD_EXT

 

 

SD_DATA0

36

I/O

SD data

VOLmax=

 

 

 

 

 

 

 

 

 

 

 

 

0.15×VDD_EXT

 

 

 

 

 

 

 

 

Antenna Interface

 

 

 

 

 

 

 

 

 

 

 

 

PIN NAME

PIN NO.

I/O

DESCRIPTION

DC

COMMENT

 

CHARACTERISTICS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RF_ANT

63

I/O

RF antenna pad

Impedance of 50Ω

 

 

 

 

 

 

 

 

Other Interface

 

 

 

 

 

 

 

 

 

 

 

 

PIN NAME

PIN NO.

I/O

DESCRIPTION

DC

COMMENT

 

CHARACTERISTICS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1, 3,

 

 

 

 

 

 

22~33,

 

 

 

 

 

RESERVD

38, 39,

 

 

 

Keep these pins

 

44, 58,

 

 

 

open.

 

 

 

 

 

 

 

75~78,

 

 

 

 

 

 

83

 

 

 

 

 

 

 

 

 

 

 

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3.2. Operating Modes

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

Table 4: Overview of Operating Modes

Mode

 

Function

 

 

 

 

 

 

 

 

After enabling sleep mode by AT+QSCLK=1, the module will

 

 

 

automatically go into Sleep Mode if DTR is set to high level and

 

 

GSM/GPRS

there is no interrupt (such as GPIO interrupt or data on UART

 

 

Sleep

port). In this case, the current consumption of module will reduce

 

 

 

to the minimal level. During Sleep Mode, the module can still

 

 

 

receive paging message and SMS from the system normally.

 

 

 

 

 

 

GSM IDLE

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

 

 

GSM TALK

consumption is decided by the configuration of Power Control

Normal

 

 

Level (PCL), dynamic DTX control and the working RF band.

Operation

 

GPRS IDLE

The module is not registered to GPRS network. The module is

 

 

not reachable through GPRS channel.

 

 

 

 

 

 

 

 

 

GPRS

The module is registered to GPRS network, but no GPRS PDP

 

 

context is active. The SGSN knows the Routing Area where the

 

 

STANDBY

 

 

module is located at.

 

 

 

 

 

 

 

 

 

 

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

 

 

GPRS READY

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

 

 

GPRS DATA

is decided by the PCL, working RF band and GPRS multi-slot

 

 

 

configuration.

 

 

 

 

 

Normal shutdown by sending the AT+QPOWD=1 command or using the PWRKEY

 

 

or the EMERG_OFF1) pin. The power management ASIC disconnects the power

POWER DOWN

 

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

 

AT+CFUN command can set the module to a minimum functionality mode without

Functionality

 

removing the power supply. In this case, the RF part of the module will not work or

Mode (without

 

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

removing power

 

but the UART port is still accessible. The power consumption in this case is very

supply)

 

low.

 

 

 

 

 

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NOTE

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.

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 the M85 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.

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VBAT

+

 

 

 

 

 

 

 

 

 

 

 

C1

 

C2

 

C3

 

C4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100uF 100nF 10pF 33pF

0603 0603

GND

Figure 4: Reference Circuit for the VBAT Input

3.3.3. Reference Design For Power Supply

The power design for the module is very important, since the performance of power supply for the module largely depends on the power source. The power supply is capable of providing the sufficient current up to 2A at least. If the voltage drop between the input and output is not too high, it is suggested to use a LDO as module’s power supply. If there is a big voltage difference between the input source and the desired output (VBAT), a switcher power converter is recommended to use as a power supply.

Figure 5 shows a reference design for +5V input power source. The designed output for the power supply is 4.0V and the maximum load current is 3A. In addition, in order to get a stable output voltage, a zener diode is placed close to the pins of VBAT. As to the zener diode, it is suggested to use a zener diode whose reverse zener voltage is 5.1V and dissipation power is more than 1 Watt.

MIC29302WU U1

DC_IN

2 IN

C1

 

 

C2

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

470uF

 

 

100nF

 

 

 

 

 

51K

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4.7K

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MCU_POWER_ON/OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

47K

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VBAT

 

 

OUT 4

 

 

 

 

 

 

 

 

R2

 

 

 

 

EN

3 GND

5 ADJ

124K

 

C3

C4

 

 

R4

D1

 

 

 

 

 

 

 

R3

470R

470uF

100nF

5.1V

 

 

 

56K

 

 

 

 

 

 

 

Figure 5: Reference Circuit for Power Supply

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NOTE

It is suggested to control the module’s main power supply (VBAT) via LDO enable pin to restart the module when the module has become abnormal. Power switch circuit like P-channel MOSFET switch circuit can also be used to control VBAT.

3.3.4. Monitor Power Supply

The command AT+CBC can be used to monitor the supply voltage of the module. The unit of the displayed voltage is mV.

For details, please refer to the document [1].

3.4. Power On and Down Scenarios

3.4.1. Power On

The module can be turned on by driving the pin PWRKEY to a low level voltage. An open collector driver circuit is suggested to control the PWRKEY. A simple reference circuit is illustrated as below.

PWRKEY

4.7K

Turn on pulse

47K

Figure 6: Turn on the Module with an Open-collector Driver

NOTES

1.M85 module is set to autobauding mode (AT+IPR=0) by default. In the autobauding mode, URC

―RDY‖ is not reported to the host controller after module is powered on. When the module is powered on after a delay of 4 or 5 seconds, it can receive AT command. Host controller should first send an AT string in order that the module can detect baud rate of host controller, and it should continue to send the next AT string until receiving OK string from the module. Then enter AT+IPR=x;&W to set a fixed baud rate for the module and save the configuration to flash memory of the module. After these

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