Quectel M85 User Manual
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Quectel M85 User Manual

Gsm/gprs module series
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M85
Hardware Design
GSM/GPRS Module Series
Rev. M85_Hardware_Design_V3.0
Date: 2015-10-22
www.quectel.com

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Summary of Contents for Quectel M85

  • Page 1 Hardware Design GSM/GPRS Module Series Rev. M85_Hardware_Design_V3.0 Date: 2015-10-22 www.quectel.com...
  • Page 2 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.

  • Page 3: About The Document

    GSM/GPRS Module Series M85 Hardware Design About the Document History Revision Date Author Description 2012-07-15 Winter CHEN Initial 2013-11-04 Felix YIN Optimized the parameters of VBAT ripple in Table 33 Updated module key features in Table 1 Modified pin assignment in Figure 2 Updated DC characteristics of module’s pins in...

  • Page 4: Table Of Contents

    GSM/GPRS Module Series M85 Hardware Design Contents About the Document ........................... 2 Contents ............................... 3 Table Index ..............................6 Figure Index ..............................7 Introduction ............................9 1.1. Safety Information ......................... 10 Product Concept ..........................11 2.1. General Description ....................... 11 2.2.
  • Page 5 GSM/GPRS Module Series M85 Hardware Design 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.
  • Page 6 GSM/GPRS Module Series M85 Hardware Design 6.4. Bottom View of the Module ....................77 Storage and Manufacturing ......................78 7.1. Storage ..........................78 7.2. Soldering ..........................79 7.3. Packaging ..........................80 Appendix A Reference ........................82 Appendix B GPRS Coding Scheme ....................87 10 Appendix C GPRS Multi-slot Class ....................
  • Page 7 GSM/GPRS Module Series M85 Hardware Design 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 ....................
  • Page 8 GSM/GPRS Module Series M85 Hardware Design 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 ..........
  • Page 9 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) ................

  • Page 10: Introduction

    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.

  • Page 11: Safety Information

    If not so, Quectel does not take on any liability for customer failure to comply with these precautions.

  • Page 12: Product Concept

    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.

  • Page 13: Fcc Radiation Exposure Statement

    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.
  • Page 14 GSM/GPRS Module Series M85 Hardware Design  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 ...

  • Page 15: Functional Diagram

    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...

  • Page 16: Evaluation Board

    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.

  • Page 17: Application Interface

    GSM/GPRS Module Series M85 Hardware Design 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   Serial interfaces ...

  • Page 18: Pin Of Module

    GSM/GPRS Module Series M85 Hardware Design 3.1. Pin of Module 3.1.1. Pin Assignment RESERVED SIM1_VDD ADC0 SIM1_CLK Top view RESERVED SIM1_DATA NETLIGHT SIM1_RST SPK2P SIM_GND AGND RESERVED MIC2P MIC2N RESERVED MIC1P RESERVED MIC1N SPK1N RESERVED SPK1P RESERVED LOUDSPKN RESERVED DBG_RXD...

  • Page 19: Pin Description

    GSM/GPRS Module Series M85 Hardware Design 3.1.2. Pin Description Table 3: Pin Description Power Supply PIN NAME PIN NO. DESCRIPTION COMMENT CHARACTERISTICS Make sure that supply sufficient Main power supply of Vmax=4.6V 67, 68, 69, current in a VBAT module: Vmin=3.3V...
  • Page 20 GSM/GPRS Module Series M85 Hardware Design PIN NAME PIN NO. DESCRIPTION COMMENT CHARACTERISTICS Emergency off. Pulled Open down for at least 40ms, drain/collector which will turn off the driver required in VILmax=0.45V EMERG_ module in case of cellular device VIHmin=1.35V emergency.
  • Page 21 GSM/GPRS Module Series M85 Hardware Design ringtone output. Network Status Indicator PIN NAME PIN NO. DESCRIPTION COMMENT CHARACTERISTICS VOHmin= Network status 0.85×VDD_EXT If unused, keep NETLIGHT indication VOLmax= this pin open. 0.15×VDD_EXT UART Port PIN NAME PIN NO. DESCRIPTION COMMENT...
  • Page 22 GSM/GPRS Module Series M85 Hardware Design The voltage can be SIM1_VDD Power supply for SIM selected by software card automatically. Either SIM2_VDD 1.8V or 3V. VOLmax= SIM1_CLK All signals of SIM 0.15×SIM_VDD SIM clock interface should be VOHmin= protected against SIM2_CLK 0.85×SIM_VDD...
  • Page 23 GSM/GPRS Module Series M85 Hardware Design VIHmin= PCM_OUT PCM data output 0.75×VDD_EXT VIHmax= VDD_EXT+0.2 If unused, keep VOHmin= these pins open. PCM frame PCM_SYNC 21 0.85×VDD_EXT synchronization VOLmax= 0.15×VDD_EXT SD Card PIN NAME PIN NO. DESCRIPTION COMMENT CHARACTERISTICS VILmin=0V VILmax=...

  • Page 24: Operating Modes

    GSM/GPRS Module Series M85 Hardware Design 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...

  • Page 25: Power Supply

    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.

  • Page 26: Reference Design For Power Supply

    GSM/GPRS Module Series M85 Hardware Design VBAT 100uF 100nF 10pF 33pF 0603 0603 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.

  • Page 27: Monitor Power Supply

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

  • Page 28: Figure 7: Turn On The Module With A Button

    GSM/GPRS Module Series M85 Hardware Design configurations, the URC RDY would be received from the UART Port of the module every time when the module is powered on. For more details, refer to the section AT+IPR in document [1]. AT command response indicates module is turned on successfully, or else the module fails to be turned on.

  • Page 29: Power Down

    GSM/GPRS Module Series M85 Hardware Design NOTES 1. Make sure that VBAT is stable before pulling down PWRKEY pin. The time of T is recommended as 100ms. 2. EMERG_OFF should be floated when it is unused. 3. For more details about the application of STATUS pin, please refer to the Chapter 3.15.

  • Page 30: Power Down Module Using At Command

    GSM/GPRS Module Series M85 Hardware Design Before the completion of the power down procedure, module sends out the result code shown as below: NORMAL POWER DOWN After that moment, no further AT commands can be executed. Then the module enters the power down mode, only the RTC is still active.

  • Page 31: Emergency Shutdown Using Emerg_Off Pin

    GSM/GPRS Module Series M85 Hardware Design The normal input voltage range is from 3.3V to 4.6V. If the voltage is >4.6V or <3.3V, the module would automatically shut down itself. If the voltage is <3.3V, the following URC will be presented: UNDER_VOLTAGE POWER DOWN If the voltage is >4.6V, the following URC will be presented:...

  • Page 32: Restart

    GSM/GPRS Module Series M85 Hardware Design EMERG_OFF TVS2 Close to K2 Figure 11: Reference Circuit for EMERG_OFF by Using Button Be cautious to use the pin EMERG_OFF. It should only be used under emergent situation. For instance, if the module is unresponsive or abnormal, the pin EMERG_OFF could be used to shut down the system.

  • Page 33: Power Saving

    GSM/GPRS Module Series M85 Hardware Design The module can also be restarted by the PWRKEY after emergency shutdown. Pulldown >40ms Delay >500ms EMERG_OFF (INPUT) STATUS (OUTPUT) PWRKEY (INPUT) Figure 13: Timing of Restarting System after Emergency Shutdown NOTE For more details about the application of STATUS pin, please refer to the Chapter 3.15.

  • Page 34: Sleep Mode

    GSM/GPRS Module Series M85 Hardware Design If the module has been set by the command with AT+CFUN=4, the RF function will be disabled, but the UART port is still active. In this case, all AT commands related with RF function will be not available.

  • Page 35: Rtc Backup

    GSM/GPRS Module Series M85 Hardware Design Use AT command AT+QPOWD, use PWRKEY Normal Mode AT+QSCLK=1 and pull up pin, or use EMERG_OFF pin Pull DTR down or Use PWRKEY pin, or use incoming voice call or SLEEP Mode EMERG_OFF pin...

  • Page 36: Figure 14: Vrtc Is Supplied By A Non-Chargeable Battery

    GSM/GPRS Module Series M85 Hardware Design Module Core Power Supply VBAT LDO/DCDC 1.5K VRTC Non-chargeable Backup Battery Figure 14: VRTC is Supplied by a Non-chargeable Battery Module Core Power Supply VBAT LDO/DCDC 1.5K VRTC Rechargeable Backup Battery Figure 15: VRTC is Supplied by a Rechargeable Battery...

  • Page 37: Serial Interfaces

    GSM/GPRS Module Series M85 Hardware Design Module Core Power Supply VBAT LDO/DCDC 1.5K VRTC Large Capacitance Capacitor Figure 16: VRTC is Supplied by a Capacitor For the choice of a rechargeable or non-chargeable coin-cell battery, please visit http://www.sii.co.jp/en/. NOTE If you want to keep an accurate real time, please keep the main power supply VBAT alive.

  • Page 38: Table 6: Logic Levels Of The Uart Interface

    GSM/GPRS Module Series M85 Hardware Design NOTE Hardware flow control is disabled by default. When hardware flow control is required, RTS and CTS should be connected to the host. AT command AT+IFC=2,2 is used to enable hardware flow control. AT command AT+IFC=0,0 is used to disable the hardware flow control.

  • Page 39: Uart Port

    GSM/GPRS Module Series M85 Hardware Design Data terminal ready Clear to send Transmit data Receive data Request to send TXD_AUX Transmit data Auxiliary UART Port RXD_AUX Receive data 3.7.1. UART Port 3.7.1.1. The Features of UART Port  Contain data lines TXD and RXD, hardware flow control lines RTS and CTS, other control lines DTR, DCD and RI.

  • Page 40: The Connection Of Uart Port

    GSM/GPRS Module Series M85 Hardware Design If the host controller needs URC in the mode of autobauding, it must be synchronized firstly. Otherwise the URC will be discarded. 2. Restrictions on autobauding operation  The UART port has to be operated at 8 data bits, no parity and 1 stop bit (factory setting).

  • Page 41: Firmware Upgrade

    GSM/GPRS Module Series M85 Hardware Design Three-line connection is shown as below. Module (DCE) Host (DTE) Controller UART port Figure 18: Reference Design for UART Port UART Port with hardware flow control is shown as below. This connection will enhance the reliability of the mass data communication.

  • Page 42: Debug Port

    GSM/GPRS Module Series M85 Hardware Design Module (DCE) IO Connector UART port PWRKEY PWRKEY Figure 20: Reference Design for Firmware Upgrade NOTE The firmware of module might need to be upgraded due to certain reasons. It is recommended to reserve these pins in the host board for firmware upgrade.

  • Page 43: Auxiliary Uart Port

    GSM/GPRS Module Series M85 Hardware Design 3.7.3. Auxiliary UART Port  Two data lines: TXD_AUX and RXD_AUX.  Auxiliary UART port is used for AT command only and does not support GPRS data, multiplexing function etc.  Auxiliary UART port supports the communication baud rates as the following: 1200, 2400, 4800, 9600, 14400, 19200, 28800, 38400, 57600, 115200bps.

  • Page 44: Figure 24: Sketch Map For Rs-232 Interface Match

    GSM/GPRS Module Series M85 Hardware Design NOTE It is highly recommended to add the resistor divider circuit on the UART signal lines when the host’s level is 3V or 3.3V. For the higher voltage level system, a level shifter IC could be used between the host and the module.

  • Page 45: Audio Interfaces

    GSM/GPRS Module Series M85 Hardware Design 3.8. Audio Interfaces The module provides two analogy input channels and three analogy output channels. Table 8: Pin Definition of Audio Interface Interface Pin Name Pin No. Description MIC1P Channel 1 Microphone positive input...

  • Page 46: Decrease Tdd Noise And Other Noise

    GSM/GPRS Module Series M85 Hardware Design Use AT command AT+QAUDCH to select audio channel:  0--AIN1/AOUT1, the default value is 0.  1--AIN2/AOUT2  2--AIN2/AOUT3 For each channel, you can use AT+QMIC to adjust the input gain level of microphone. Customer can also use AT+CLVL to adjust the output gain level of receiver and speaker.

  • Page 47: Microphone Interfaces Design

    GSM/GPRS Module Series M85 Hardware Design 3.8.2. Microphone Interfaces Design AIN1 and AIN2 channels come with internal bias supply for external electret microphone. A reference circuit is shown in the following figure. Close to Microphone Differential layout 10pF 33pF 0603...

  • Page 48: Figure 27: Speaker Interface Design With An Amplifier For Aout1

    GSM/GPRS Module Series M85 Hardware Design Close to speaker 10pF 33pF Differential 0603 0603 layout Amplifier circuit SPK1P 33pF 10pF Module 0603 0603 SPK1N 10pF 33pF 0603 0603 Figure 27: Speaker Interface Design with an Amplifier for AOUT1 Close to Speaker...

  • Page 49: Earphone Interface Design

    GSM/GPRS Module Series M85 Hardware Design Close to Speaker Differential layout Amplifier 10pF 33pF 0603 0603 circuit SPK2P Module AGND 10pF 33pF 0603 0603 Figure 29: Speaker Interface Design with an Amplifier for AOUT2 The suitable differential audio amplifier can be chosen from the Texas Instrument’s website (http://www.ti.com/).

  • Page 50: Loud Speaker Interface Design

    GSM/GPRS Module Series M85 Hardware Design 3.8.5. Loud Speaker Interface Design Close to Speaker Differential layout 10pF 33pF 0603 0603 LOUDSPKP Module 100pF LOUDSPKN 10pF 33pF 0603 0603 Figure 31: Loud Speaker Interface Design 3.8.6. Audio Characteristics Table 10: Typical Electret Microphone Characteristics Parameter Min.

  • Page 51: Sim Card Interfaces

    GSM/GPRS Module Series M85 Hardware Design Load resistance AOUT2 Single-ended Output Ref level Load resistance AOUT3 Differential Output Ref level 2×VBAT 3.9. SIM Card Interfaces The module contains two SIM interfaces to allow module access the two SIM cards. Only one SIM card can work at a time.

  • Page 52: Figure 32: Reference Circuit For Sim1 Interface With 8-Pin Sim Card Holder

    GSM/GPRS Module Series M85 Hardware Design SIM1_PRESENCE SIM1 card detection SIM_GND SIM card ground The following figure is the reference design for SIM interface, and here an 8-pin SIM card holder is used. The pin SIM1_PRESENCE is used to detect whether the tray of the Molex SIM socket, which is used for holding SIM card, is present in the card socket.

  • Page 53: Figure 33: Reference Circuit For Sim1 Interface With The 6-Pin Sim Card Holder

    GSM/GPRS Module Series M85 Hardware Design If the SIM1 card detection function is not used, keep SIM1_PRESENCE pin open. The reference circuit for a 6-pin SIM card socket is illustrated as the following figure. SIM_GND 100nF SIM_Holder SIM1_VDD SIM1_RST Module...

  • Page 54: Sd Card Interface

    GSM/GPRS Module Series M85 Hardware Design In order to enhance the reliability and availability of the SIM card in application. Please follow the below criteria in the SIM circuit design:  Keep layout of SIM card as close as possible to the module. Assure the length of the trace as less than 200mm as possible.

  • Page 55: Table 13: Pin Definition Of The Sd Card Interface

    GSM/GPRS Module Series M85 Hardware Design Table 13: Pin Definition of the SD Card Interface Pin Name Pin No. Description SD_CMD Command signal of SD card output SD_CLK Clock signal of SD card output SD_DATA0 Data output and input signal of SD card...

  • Page 56: Pcm Interface

    The SD_CLK and SD_DATA0 line must be shielded by ground in order to improve EMI. 3.11. PCM Interface M85 supports PCM interface. It is used for digital audio transmission between the module and the device. This interface is composed of PCM_CLK, PCM_SYNC, PCM_IN and PCM_OUT signal lines.

  • Page 57: Configuration

    3.11.1. Configuration M85 module supports 13-bit line code PCM format. The sample rate is 8 KHz, and the clock source is 256 KHz, and the module can only act as master mode. The PCM interface supports both long and short synchronization simultaneously.

  • Page 58: Figure 36: Long Synchronization & Sign Extension Diagram

    GSM/GPRS Module Series M85 Hardware Design PCM_CLK PCM_SYNC Sign 12 11 10 PCM_OUT extension Sign PCM_IN 12 11 10 9 extension Figure 36: Long Synchronization & Sign Extension Diagram PCM_CLK PCM_SYNC PCM_OUT 12 11 10 9 Zero padding PCM_IN 12 11 10 9 Zero padding Figure 37: Long Synchronization &...

  • Page 59: Reference Design

    PCM_IN 12 11 10 Zero padding Figure 39: Short Synchronization & Zero Padding Diagram 3.11.3. Reference Design M85 can only work as a master, providing synchronization and clock source. The reference design is shown as below. Peripheral Module (Slave) (Master)

  • Page 60: Adc

    GSM/GPRS Module Series M85 Hardware Design Table 17: QPCMON Command Description Parameter Scope Description 0: Close PCM Mode 1: Open PCM 2: Open PCM when audio talk is set up 0: Short synchronization Sync_Type 1: Long synchronization Sync_Length Programmed from one bit to eight bit...

  • Page 61: Behaviors Of The Ri

    GSM/GPRS Module Series M85 Hardware Design Table 19: Pin Definition of the ADC Pin Name Pin No. Description ADC0 Analog to digital converter. Table 20: Characteristics of the ADC Item Min. Typ. Max. Units Voltage Range ADC Resolution bits ADC Accuracy 3.13.

  • Page 62: Figure 41: Ri Behavior Of Voice Calling As A Receiver

    GSM/GPRS Module Series M85 Hardware Design If the module is used as a caller, the RI would maintain high except the URC or SMS is received. On the other hand, when it is used as a receiver, the timing of the RI is shown as below.

  • Page 63: Network Status Indication

    GSM/GPRS Module Series M85 Hardware Design 3.14. Network Status Indication The NETLIGHT signal can be used to drive a network status indicator LED. The working state of this pin is listed in the following table. Table 22: Working State of the NETLIGHT...

  • Page 64: Table 23: Pin Definition Of The Status

    GSM/GPRS Module Series M85 Hardware Design Table 23: Pin Definition of the STATUS Pin Name Pin No. Description STATUS Indicate module operating status VBAT 300R Module 4.7K STATUS Figure 45: Reference Design for STATUS M85_Hardware_Design Confidential / Released 63 / 88...

  • Page 65: Antenna Interface

    GSM/GPRS Module Series M85 Hardware Design Antenna Interface The Pin 63 is the RF antenna pad. The RF interface has an impedance of 50Ω. Table 24: Pin Definition of the RF_ANT Pin Name Pin No. Description Ground Ground RF_ANT RF antenna pad...

  • Page 66: Rf Output Power

    RF antenna pad should be coplanar waveguide line or microstrip line, whose characteristic impedance should be close to 50Ω. M85 comes with grounding pads which are next to the antenna pad in order to give a better grounding. Besides, a π type match circuit is suggested to be used to adjust the RF performance.

  • Page 67: Operating Frequencies

    GSM/GPRS Module Series M85 Hardware Design 4.4. Operating Frequencies Table 27: The Module Operating Frequencies Frequency Receive Transmit ARFCH GSM850 869~894MHz 824~849MHz 128~251 EGSM900 925~960MHz 880~915MHz 0~124, 975~1023 DCS1800 1805~1880MHz 1710~1785MHz 512~885 PCS1900 1930~1990MHz 1850~1910MHz 512~810 4.5. Antenna Requirement The following table shows the requirement on GSM antenna.

  • Page 68: Rf Cable Soldering

    GSM/GPRS Module Series M85 Hardware Design 4.6. RF Cable Soldering Soldering the RF cable to RF pad of module correctly will reduce the loss on the path of RF, please refer to the following example of RF soldering. Figure 47: RF Soldering Sample...

  • Page 69: Electrical, Reliability And Radio Characteristics

    GSM/GPRS Module Series M85 Hardware Design Electrical, Reliability and Radio Characteristics 5.1. Absolute Maximum Ratings Absolute maximum ratings for power supply and voltage on digital and analog pins of module are listed in the following table: Table 30: Absolute Maximum Ratings Parameter Min.

  • Page 70: Operating Temperature

    GSM/GPRS Module Series M85 Hardware Design 5.2. Operating Temperature The operating temperature is listed in the following table: Table 31: Operating Temperature Parameter Min. Typ. Max. Unit ℃ Normal Temperature ℃ Restricted Operation -40 ~ -35 +80 ~ +85 ℃...

  • Page 71: Current Consumption

    GSM/GPRS Module Series M85 Hardware Design AT+CFUN=4 IDLE mode SLEEP mode TALK mode GSM850/EGSM900 223/219 DCS1800/PCS1900 153/151 DATA mode, GPRS (3Rx,2Tx) GSM850/EGSM900 363/393 DCS1800/PCS1900 268/257 DATA mode, GPRS (2Rx,3Tx) GSM850/EGSM900 506/546 DCS1800/PCS1900 366/349 DATA mode, GPRS (4Rx,1Tx) GSM850/EGSM900 217/234 DCS1800/PCS1900...
  • Page 72 GSM/GPRS Module Series M85 Hardware Design @power level #12, Typical 83mA @power level #19, Typical 62mA @power level #5 <300mA, Typical 219mA EGSM900 @power level #12, Typical 83mA @power level #19, Typical 63mA @power level #0 <250mA, Typical 153mA DCS1800...

  • Page 73: Electro-Static Discharge

    GSM/GPRS Module Series M85 Hardware Design @power level #5 <350mA, Typical 216mA GSM850 @power level #12, Typical 103mA @power level #19, Typical 83mA @power level #5 <350mA, Typical 233mA EGSM900 @power level #12, Typical 104mA @power level #19, Typical 84mA @power level #0 <300mA, Typical 171mA...

  • Page 74: Table 34: The Esd Endurance (Temperature: 25º C, Humidity: 45%)

    GSM/GPRS Module Series M85 Hardware Design The measured ESD values of module are shown as the following table: Table 34: The ESD Endurance (Temperature: 25º C, Humidity: 45%) Tested Point Contact Discharge Air Discharge VBAT, GND ± 5KV ± 10KV RF_ANT ±...

  • Page 75: Mechanical Dimensions

    GSM/GPRS Module Series M85 Hardware Design Mechanical Dimensions This chapter describes the mechanical dimensions of the module. 6.1. Mechanical Dimensions of Module Figure 48: M85 Module Top and Side Dimensions (Unit: mm) M85_Hardware_Design Confidential / Released 74 / 88...

  • Page 76: Figure 49: M85 Module Bottom Dimensions (Unit: Mm)

    GSM/GPRS Module Series M85 Hardware Design Figure 49: M85 Module Bottom Dimensions (Unit: mm) Figure 50: The PAD Dimensions (Unit: mm) M85_Hardware_Design Confidential / Released 75 / 88...

  • Page 77: Recommended Footprint

    GSM/GPRS Module Series M85 Hardware Design 6.2. Recommended Footprint Figure 51: Recommended Footprint (Unit: mm) NOTE The module should keep about 3mm away from other components in the host PCB. M85_Hardware_Design Confidential / Released 76 / 88...

  • Page 78: Top View Of The Module

    GSM/GPRS Module Series M85 Hardware Design 6.3. Top View of the Module Figure 52: Top View of the Module 6.4. Bottom View of the Module Figure 53: Bottom View of the Module M85_Hardware_Design Confidential / Released 77 / 88...

  • Page 79: Storage And Manufacturing

    Storage and Manufacturing 7.1. Storage M85 module is distributed in a vacuum-sealed bag. The restriction for storage is shown as below. Shelf life in the vacuum-sealed bag: 12 months at environments of <40º C temperature and < 90%RH. After the vacuum-sealed bag is opened, devices that need to be mounted directly must be: ...

  • Page 80: Soldering

    To ensure the module soldering quality, the thickness of stencil at the hole of the module pads should be 0.2 mm for M85. For more details, please refer to document [13]. It is suggested that peak reflow temperature is from 235º C to 245º C (for SnAg3.0Cu0.5 alloy). Absolute max reflow temperature is 260º...

  • Page 81: Packaging

    GSM/GPRS Module Series M85 Hardware Design 7.3. Packaging M85 modules are shipped in tape and reel form. The reel is 330mm in diameter and each reel contains 250pcs modules. This is especially suitable for the M85 according to SMT assembly processes requirements.

  • Page 82: Table 35: Reel Packing

    GSM/GPRS Module Series M85 Hardware Design DETAIL:A DC 圆盘44 DETAIL:A Figure 55: Tape and Reel Information Table 35: Reel Packing Model Name MOQ for MP Minimum Package: 250pcs Minimum Package×4=1000pcs Size: 370 × 350 × 56mm Size: 380 × 250 × 365mm 250pcs N.W: 0.78kg...

  • Page 83: Appendix A Reference

    GSM/GPRS Module Series M85 Hardware Design Appendix A Reference Table 36: Related Documents Document Name Remark Quectel_M85_AT_Commands_Manual AT commands manual Serial asynchronous automatic dialing and ITU-T Draft new recommendation V.25ter control Digital cellular telecommunications (Phase GSM 07.07 2+); AT command set for GSM Mobile Equipment (ME) GSM 07.10...

  • Page 84: Table 37: Terms And Abbreviations

    GSM/GPRS Module Series M85 Hardware Design [12] Quectel_GSM_EVB_User_Guide GSM EVB user guide [13] Quectel_Module_Secondary_SMT_User_Guide Module secondary SMT user guide Table 37: Terms and Abbreviations Abbreviation Description Analog-to-Digital Converter Adaptive Multi-Rate Antenna Reference Point ASIC Application Specific Integrated Circuit Bit Error Rate...
  • Page 85 GSM/GPRS Module Series M85 Hardware Design Electromagnetic Compatibility Electrostatic Discharge European Telecommunication Standard Federal Communications Commission (U.S.) FDMA Frequency Division Multiple Access Full Rate GMSK Gaussian Minimum Shift Keying GPRS General Packet Radio Service Global System for Mobile Communications Gross Weight...
  • Page 86 GSM/GPRS Module Series M85 Hardware Design Password Authentication Protocol PBCCH Packet Switched Broadcast Control Channel Printed Circuit Board Protocol Data Unit Point-to-Point Protocol Radio Frequency Root Mean Square (value) Real Time Clock Receive Direction Subscriber Identification Module Short Message Service...
  • Page 87 GSM/GPRS Module Series M85 Hardware Design 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...

  • Page 88: Appendix B Gprs Coding Scheme

    GSM/GPRS Module Series M85 Hardware Design Appendix B GPRS Coding Scheme Four coding schemes are used in GPRS protocol. The differences between them are shown in the following table. Table 38: Description of Different Coding Schemes Radio Data Code Pre-coded...

  • Page 89: Figure 57: Radio Block Structure Of Cs-4

    GSM/GPRS Module Series M85 Hardware Design Radio block structure of CS-4 is shown as the following figure. Radio Block Block No coding Code 456 bits Figure 57: Radio Block Structure of CS-4 M85_Hardware_Design Confidential / Released 88 / 88...

  • Page 90: Appendix C Gprs Multi-Slot Class

    GSM/GPRS Module Series M85 Hardware Design Appendix C GPRS Multi-slot Class Twenty-nine classes of GPRS multi-slot modes are defined for MS in GPRS specification. Multi-slot classes are product dependant, and determine the maximum achievable data rates in both the uplink and downlink directions.

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