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Quectel M66 Hardware Design

Gsm/gprs module
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M66
Hardware Design
GSM/GPRS Module Series
Rev. M66_Hardware_Design_V1.1
Date: 2014-11-24
www.quectel.com

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Summary of Contents for Quectel M66

  • Page 1 Hardware Design GSM/GPRS Module Series Rev. M66_Hardware_Design_V1.1 Date: 2014-11-24 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 M66 Hardware Design About the Document History Revision Date Author Description 2014-08-07 Felix YIN Initial 1. Modified output power of Bluetooth 2. Modified the timing of the RFTXMON signal 3. Updated Figure 5: Reference circuit for power supply 4.

  • Page 4: Table Of Contents

    GSM/GPRS Module Series M66 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 M66 Hardware Design 3.7.3. Auxiliary UART Port ....................... 38 3.7.4. UART Application ......................38 3.8. Audio Interfaces ........................40 3.8.1. Decrease TDD Noise and other Noise ................41 3.8.2. Microphone Interfaces Design ..................41 3.8.3. Receiver and Speaker Interface Design ................ 42 3.8.4.
  • Page 6 GSM/GPRS Module Series M66 Hardware Design Appendix A Reference ........................73 Appendix B GPRS Coding Scheme ....................78 10 Appendix C GPRS Multi-slot Class ....................80 M66_Hardware_Design Confidential / Released 5 / 80...
  • Page 7 GSM/GPRS Module Series M66 Hardware Design Table Index TABLE 1: MODULE KEY FEATURES ....................... 12 TABLE 2: CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE ......13 TABLE 3: IO PARAMETERS DEFINITION ......................17 TABLE 4: PIN DESCRIPTION ........................... 17 TABLE 5: OVERVIEW OF OPERATING MODES .....................
  • Page 8 GSM/GPRS Module Series M66 Hardware Design Figure Index FIGURE 1: MODULE FUNCTIONAL DIAGRAM ....................14 FIGURE 2: PIN ASSIGNMENT ......................... 16 FIGURE 3: VOLTAGE RIPPLE DURING TRANSMITTING ................22 FIGURE 4: REFERENCE CIRCUIT FOR THE VBAT INPUT ................23 FIGURE 5: REFERENCE CIRCUIT FOR POWER SUPPLY ................24 FIGURE 6: TURN ON THE MODULE WITH AN OPEN-COLLECTOR DRIVER ..........
  • Page 9 M66 Hardware Design FIGURE 42: REFERENCE DESIGN FOR BLUETOOTH ANTENNA ............... 60 FIGURE 43: M66 MODULE TOP AND SIDE DIMENSIONS (UNIT: MM) ............66 FIGURE 44: M66 MODULE BOTTOM DIMENSIONS (UNIT: MM) ..............67 FIGURE 45: RECOMMENDED FOOTPRINT (UNIT: MM) ................68 FIGURE 46: TOP VIEW OF THE MODULE ......................

  • Page 10: Introduction

    This document can help you quickly understand module interface specifications, electrical and mechanical details. Associated with application note and user guide, you can use M66 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

    M66 is an SMD type module with LCC package, which can be easily embedded into applications. It provides abundant hardware interfaces like PCM Interface. Designed with power saving technique, the current consumption of M66 is as low as 1.3 mA in SLEEP mode when DRX is 5.

  • Page 13: Key Features

    GSM/GPRS Module Series M66 Hardware Design 2.2. Key Features The following table describes the detailed features of M66 module. Table 1: Module Key Features Feature Implementation Single supply voltage: 3.3V ~ 4.6V Power Supply Typical supply voltage: 4V Typical power consumption in SLEEP mode: 1.3 mA @DRX=5 Power Saving 1.2 mA @DRX=9...
  • Page 14 GSM/GPRS Module Series M66 Hardware Design  Enhanced Full Rate (ETS 06.50/06.60/06.80)  Adaptive Multi-Rate (AMR)  Echo Suppression  Noise Reduction UART Port:  Seven lines on UART port interface  Used for AT command, GPRS data  Multiplexing function ...

  • Page 15: Functional Diagram

    Figure 1: Module Functional Diagram 2.4. Evaluation Board In order to help you to develop applications with M66, 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 16: Application Interface

    GSM/GPRS Module Series M66 Hardware Design Application Interface The module adopts LCC package and has 44 pins. The following chapters provide detailed descriptions about these pins.  Pin of module  Operating modes  Power supply  Power on/down ...

  • Page 17: Pin Of Module

    GSM/GPRS Module Series M66 Hardware Design 3.1. Pin of Module 3.1.1. Pin Assignment AGND RF_ANT SPK2P PCM_OUT MICP MICN PCM_IN SPK1P PCM_SYNC Top View SPK1N PCM_CLK PWRKEY TXD_AUX AVDD RXD_AUX ADC0 SIM_GND BT_ANT SIM_DATA RFTXMON VDD_EXT SIM_RST SIM_CLK POWER GND...

  • Page 18: Pin Description

    GSM/GPRS Module Series M66 Hardware Design 3.1.2. Pin Description Table 3: IO Parameters Definition Type Description Bidirectional input/output Digital input Digital output Power input Power output Analog input Analog output Table 4: Pin Description Power Supply PIN Name PIN No.
  • Page 19 GSM/GPRS Module Series M66 Hardware Design 2.2~4.7uF bypass capacitor, when using this pin for power supply. 27,34 36,37 Ground 40,41 Turn on/off PIN Name PIN No. Description DC Characteristics Comment max= Power on/off key. PWRKEY 0.1×VBAT should be pulled down for a...
  • Page 20 GSM/GPRS Module Series M66 Hardware Design min=0V Transmit data max= Receive data 0.25×VDD_EXT If only use min= TXD, RXD and Data terminal ready 0.75×VDD_EXT GND to Ring indication max= communicate, VDD_EXT+0.2 recommended Data carrier detection min= to keep other 0.85×VDD_EXT pins open.
  • Page 21 GSM/GPRS Module Series M66 Hardware Design max= 0.15×SIM_VDD SIM_ RST SIM reset min= 0.85×SIM_VDD SIM_ SIM ground PIN Name PIN No. Description DC Characteristics Comment max=2.9V If unused, Reference voltage of AVDD min=2.7V keep this pin ADC circuit norm=2.8V open.

  • Page 22: Operating Modes

    GSM/GPRS Module Series M66 Hardware Design 0.15×VDD_EXT Other Interface PIN Name PIN No. Description DC Characteristics Comment Keep these RESERVED pins open. 3.2. Operating Modes The table below briefly summarizes the various operating modes in the following chapters. Table 5: Overview of Operating Modes...

  • Page 23: Power Supply

    For the M66 module, the max current consumption could reach to 1.6A during a burst transmission. 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 burst transmission does not exceed 400mV.

  • Page 24: Decrease Supply Voltage Drop

    GSM/GPRS Module Series M66 Hardware Design 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 burst transmission. If the power voltage drops below 3.3V, the module could turn off automatically.

  • Page 25: Monitor Power Supply

    GSM/GPRS Module Series M66 Hardware Design MIC29302WU U1 DC_IN VBAT 124K 470uF 5.1V 470uF 100nF 100nF 470R 4.7K MCU_POWER_ON/OFF Figure 5: Reference Circuit for Power Supply 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.
  • Page 26 Figure 6: Turn on the Module with an Open-collector Driver NOTE 1. M66 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 27: Power Down

    GSM/GPRS Module Series M66 Hardware Design The turn-on timing is illustrated as the following figure. VBAT >1s > 0.6*VBAT PWRKEY <0.1*VBAT (INPUT) 54ms VDD_EXT (OUTPUT) MODULE RUNNING BOOTING STATUS Figure 8: Turn-on Timing NOTE Make sure that VBAT is stable before pulling down PWRKEY pin. The time of T is recommended to be 100ms.

  • Page 28: Power Down Module Using At Command

    GSM/GPRS Module Series M66 Hardware Design VBAT 0.7s<Pulldown<1s Logout net about 2s to 12s PWRKEY (INPUT) VDD_EXT (OUTPUT) Figure 9: Turn-off Timing The power down procedure causes the module to log off from the network and allows the firmware to save important data before completely disconnecting the power supply.

  • Page 29: Under-Voltage Automatic Shutdown

    GSM/GPRS Module Series M66 Hardware Design Please refer to the document [1] for details about the AT command AT+QPOWD. 3.4.2.3. Under-voltage Automatic Shutdown The module will constantly monitor the voltage applied on the VBAT, if the voltage is ≤3.5V, the following...

  • Page 30: Power Saving

    GSM/GPRS Module Series M66 Hardware Design 3.5. Power Saving Based on system requirements, there are several actions to drive the module to enter low current consumption status. For example, AT+CFUN can be used to set module into minimum functionality mode and DTR hardware interface signal can be used to lead system to SLEEP mode.

  • Page 31: Wake Up Module From Sleep Mode

    GSM/GPRS Module Series M66 Hardware Design 3.5.3. Wake Up Module From SLEEP Mode When the module is in the SLEEP mode, the following methods can wake up the module.  If the DTR Pin is set low, it would wake up the module from the SLEEP mode. The UART port will be active within 20ms after DTR is changed to low level.
  • Page 32 GSM/GPRS Module Series M66 Hardware Design  Use VRTC as the RTC power source. If the main power supply (VBAT) is removed after the module is turned off, a backup supply such as a coin-cell battery (rechargeable or non-chargeable) or a super-cap can be used to supply the VRTC pin to keep the real time clock active.

  • Page 33: Serial Interfaces

    GSM/GPRS Module Series M66 Hardware Design Module Core Power Supply VBAT LDO/DCDC 1.5K VRTC Large Capacitance Capacitor Figure 13: VRTC is Supplied by a Capacitor A rechargeable or non-chargeable coin-cell battery can also be used here, for more information, please visit http://www.sii.co.jp/en/.
  • Page 34 GSM/GPRS Module Series M66 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 35: Uart Port

    GSM/GPRS Module Series M66 Hardware Design Data carrier detection Clear to send Request to send DBG_RXD Receive data Debug Port DBG_TXD Transmit data RXD_AUX Receive data Auxiliary UART Port TXD_AUX Transmit data 3.7.1. UART Port 3.7.1.1. The Feature of UART Port ...

  • Page 36: The Connection Of Uart

    GSM/GPRS Module Series M66 Hardware Design If the host controller needs URC in the mode of autobauding, it must be synchronized firstly. Otherwise the URC will be discarded. Restrictions on autobauding operation:  The UART port has to be operated at 8 data bits, no parity and 1 stop bit (factory setting).

  • Page 37: Firmware Upgrade

    GSM/GPRS Module Series M66 Hardware Design Three-line connection is shown as below. Module (DCE) Host (DTE) Controller UART port Figure 15: 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 38: Debug Port

    GSM/GPRS Module Series M66 Hardware Design Module (DCE) IO Connector UART port PWRKEY PWRKEY Figure 17: 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 39: Auxiliary Uart Port

    GSM/GPRS Module Series M66 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, 115200.
  • Page 40 GSM/GPRS Module Series M66 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 41: Audio Interfaces

    GSM/GPRS Module Series M66 Hardware Design 3.8. Audio Interfaces The module provides one analog input channels and two analog output channels. Table 9: Pin Definition of Audio Interface Interface Pin Name Pin No. Description MICP Microphone positive input MICN Microphone negative input...

  • Page 42: Decrease Tdd Noise And Other Noise

    GSM/GPRS Module Series M66 Hardware Design 3.8.1. Decrease TDD Noise and other Noise The 33pF capacitor is applied for filtering out 900MHz RF interference when the module is transmitting at EGSM900MHz. Without placing this capacitor, TDD noise could be heard. Moreover, the 10pF capacitor here is for filtering out 1800MHz RF interference.

  • Page 43: Receiver And Speaker Interface Design

    GSM/GPRS Module Series M66 Hardware Design 3.8.3. Receiver and Speaker Interface Design Close to speaker 10pF 33pF Differential layout 0603 0603 Module SPK1P 33pF 10pF 0603 0603 SPK1N 10pF 33pF 0603 0603 Figure 23: Handset Interface Design for AOUT1 Close to speaker...
  • Page 44 GSM/GPRS Module Series M66 Hardware Design Close to Speaker Differential layout 10pF 33pF 0603 0603 22uF SPK2P Module AGND Figure 25: Handset Interface Design for AOUT2 Close to Speaker Differential layout Amplifier 10pF 33pF 0603 0603 circuit SPK2P Module AGND...

  • Page 45: Earphone Interface Design

    GSM/GPRS Module Series M66 Hardware Design 3.8.4. Earphone Interface Design Close to Module Close to Socket Differential 33pF 10pF 4.7uF layout Module 0603 0603 MICN 10pF 33pF 10pF 33pF 0603 0603 0603 0603 MICP 33pF 10pF 0603 0603 SPK2P AGND...

  • Page 46: Pcm Interface

    3.9.1. Configuration M66 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 47: Timing

    The sample rate of the PCM interface is 8 KHz and the clock source is 256 KHz, so every frame contains 32 bits data, since M66 supports 16 bits line code PCM format, the left 16 bits are invalid. The following diagram shows the timing of different combinations.
  • Page 48 GSM/GPRS Module Series M66 Hardware Design PCM_CLK PCM_SYNC PCM_OUT 12 11 10 9 Zero padding PCM_IN 12 11 10 9 Zero padding Figure 29: Long Synchronization & Zero Padding Diagram PCM_CLK PCM_SYNC PCM_OUT 12 11 10 Sign extension PCM_IN 12 11 10 Sign extension Figure 30: Short Synchronization &...

  • Page 49: Reference Design

    GSM/GPRS Module Series M66 Hardware Design 3.9.3. Reference Design M66 can only work as a master, providing synchronization and clock source. The reference design is shown as below. Peripheral Module (Slave) (Master) PCM_CLK PCM_CLK PCM_SYNC PCM_SYNC PCM_OUT PCM_IN PCM_OUT PCM_IN Figure 32: Reference Design for PCM 3.9.4.

  • Page 50: Sim Card Interface

    GSM/GPRS Module Series M66 Hardware Design AT+QPCMVOL can configure the volume of input and output. AT+QPCMVOL=vol_pcm_in, vol_pcm_out Table 15: QPCMVOL Command Description Parameter Scope Description vol_pcm_in 0~32767 Set the input volume Set the output volume vol_pcm_out 0~32767 The voice may be distorted when this value exceeds 16384.
  • Page 51 GSM/GPRS Module Series M66 Hardware Design The reference circuit for a 6-pin SIM card socket is illustrated as the following figure. SIM_GND 100nF SIM_Holder SIM_VDD SIM_RST Module SIM_CLK SIM_DATA 33pF33pF 33pF 33pF Figure 33: Reference Circuit for SIM Interface with the 6-pin SIM Card Holder...

  • Page 52: Adc

    GSM/GPRS Module Series M66 Hardware Design 3.11. ADC The module provides an ADC channel to measure the value of voltage. Please give priority to the use of ADC0 channel. The command AT+QADC can read the voltage value applied on ADC0 pin. For details of this AT command, please refer to the document [1].
  • Page 53 GSM/GPRS Module Series M66 Hardware Design 120ms, then changes to HIGH. Certain URCs can trigger 120ms low level on RI. For more details, please refer to the document [1] 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 below.

  • Page 54: Network Status Indication

    GSM/GPRS Module Series M66 Hardware Design 3.13. 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 20: Working State of the NETLIGHT...

  • Page 55: Rf Transmitting Signal Indication

    GSM/GPRS Module Series M66 Hardware Design 3.14. RF Transmitting Signal Indication The M66 provides a RFTXMON pins which will rise when the transmitter is active and fall after the transmitter activity is completed. Table 21: Pin Definition of the RFTXMON Pin Name Pin No.
  • Page 56 GSM/GPRS Module Series M66 Hardware Design 2) Active during the Call RFTXMON will be HIGH during a call and the pin will become LOW after being hanged up. You can execute AT+QCFG=“RFTXburst”, 2 to enable the function. The timing of the RFTXMON signal is shown below.

  • Page 57: Antenna Interface

    Antenna Interface M66 has two antenna interfaces, GSM antenna and BT antenna. The Pin 26 is the Bluetooth antenna pad. The Pin 35 is the GSM antenna pad. The RF interface of the two antenna pad has an impedance of 50Ω.

  • Page 58: Rf Output Power

    RF antenna pad should be coplanar waveguide line or microstrip line, whose characteristic impedance should be close to 50Ω. M66 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 59: Rf Receiving Sensitivity

    GSM/GPRS Module Series M66 Hardware Design PCS1900 30dBm± 2dB 0dBm± 5dB NOTE In GPRS 4 slots TX mode, the max output power is reduced by 2.5dB. This design conforms to the GSM specification as described in section 13.16 of 3GPP TS 51.010-1.

  • Page 60: Rf Cable Soldering

    Bluetooth is standardized as IEEE802.15 and operates in the 2.4 GHz range using RF technology. Its data rates of up to 3Mbps. M66 is fully compliant with Bluetooth specification 3.0. M66 supports profile including SPP and OPP. The module provides a Bluetooth antenna pad named BT_ANT.
  • Page 61 GSM/GPRS Module Series M66 Hardware Design The external antenna must be matched properly to achieve best performance, so the matching circuit is necessary, the connection is recommended as in the following figure: BT_ANT Module Figure 42: Reference Design for Bluetooth Antenna There are some suggestions for placing components and RF trace lying for Bluetooth RF traces: ...

  • Page 62: Electrical, Reliability And Radio Characteristics

    GSM/GPRS Module Series M66 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 29: Absolute Maximum Ratings Parameter Min.

  • Page 63: Power Supply Ratings

    GSM/GPRS Module Series M66 Hardware Design Restricted Operation -40 ~ -35 +80 ~ +85 ℃ Storage Temperature ℃ NOTE When the module works within this temperature range, the deviation from the GSM specification may occur. For example, the frequency error or the phase error will be increased.

  • Page 64: Current Consumption

    GSM/GPRS Module Series M66 Hardware Design DATA mode, GPRS (4 Rx, 1Tx) GSM850/EGSM900 217/234 DCS1800/PCS1900 172/170 DATA mode, GPRS (1Rx, 4Tx) GSM850/EGSM900 458/485 DCS1800/PCS1900 462/439 Peak supply current (during Maximum power control level transmission on GSM850 and EGSM900. slot) NOTE Power control level PCL 5.
  • Page 65 GSM/GPRS Module Series M66 Hardware Design DATA Mode, GPRS ( 3 Rx, 2Tx ) CLASS 12 @power level #5 <550mA, Typical 363mA GSM850 @power level #12, Typical 131mA @power level #19, Typical 91mA @power level #5 <550mA, Typical 393mA EGSM900...

  • Page 66: Electro-Static Discharge

    GSM/GPRS Module Series M66 Hardware Design @power level #5 <660mA, Typical 457mA GSM850 @power level #12, Typical 182mA @power level #19, Typical 106mA @power level #5 <660mA, Typical 484mA EGSM900 @power level #12, Typical 187mA @power level #19, Typical 109mA @power level #0 <530mA, Typical 461mA...

  • Page 67: Mechanical Dimensions

    GSM/GPRS Module Series M66 Hardware Design Mechanical Dimensions This chapter describes the mechanical dimensions of the module. 6.1. Mechanical Dimensions of Module Figure 43: M66 Module Top and Side Dimensions (Unit: mm) M66_Hardware_Design Confidential / Released 66 / 80...
  • Page 68 GSM/GPRS Module Series M66 Hardware Design Figure 44: M66 Module Bottom Dimensions (Unit: mm) M66_Hardware_Design Confidential / Released 67 / 80...

  • Page 69: Recommended Footprint

    GSM/GPRS Module Series M66 Hardware Design 6.2. Recommended Footprint Figure 45: Recommended Footprint (Unit: mm) NOTE The module should be kept about 3mm away from other components in the host PCB. The circular test points with a radius of 1.75mm in the above recommended footprint should be treated as keepout areas.

  • Page 70: Top View Of The Module

    GSM/GPRS Module Series M66 Hardware Design 6.3. Top View of the Module Figure 46: Top View of the Module 6.4. Bottom View of the Module Figure 47: Bottom View of the Module M66_Hardware_Design Confidential / Released 69 / 80...

  • Page 71: Storage And Manufacturing

    Storage and Manufacturing 7.1. Storage M66 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 72: Soldering

    To ensure the module soldering quality, the thickness of stencil at the hole of the module pads should be 0.2 mm for M66.For more details, please refer to document [12] 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 73: Tape And Reel Packaging

    GSM/GPRS Module Series M66 Hardware Design 7.3.1. Tape and Reel Packaging The reel is 330mm in diameter and each reel contains 250 modules. Figure 49: Tape and Reel Specification Figure 50: Dimensions of Reel M66_Hardware_Design Confidential / Released 72 / 80...
  • Page 74 GSM/GPRS Module Series M66 Hardware Design Appendix A Reference Table 34: Related Documents Document Name Remark Quectel_M66_AT_Commands_Manual AT commands manual Serial asynchronous automatic dialing ITU-T Draft new recommendation V.25ter and control Digital cellular telecommunications GSM 07.07 (Phase 2+); AT command set for GSM Mobile Equipment (ME) Support GSM 07.10 multiplexing...
  • Page 75 GSM/GPRS Module Series M66 Hardware Design [10] GSM_UART_Application_Note UART port application note [11] GSM_EVB_User_Guide GSM EVB user guide [12] Module_Secondary_SMT_User_Guide Module secondary SMT user guide GSM Module Digital IO Application [13] Quectel_GSM_Module_Digital_IO_Application_Note Note Table 35: Terms and Abbreviations Abbreviation Description...
  • Page 76 GSM/GPRS Module Series M66 Hardware Design Discontinuous Transmission Enhanced Full Rate EGSM Enhanced GSM 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...
  • Page 77 GSM/GPRS Module Series M66 Hardware Design Mobile Terminated Net Weight 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...
  • Page 78 GSM/GPRS Module Series M66 Hardware Design Maximum Input Low Level Voltage Value Minimum Input Low Level Voltage Value Absolute Maximum Input Voltage Value norm Absolute Normal Input Voltage Value Absolute Minimum Input Voltage Value Maximum Output High Level Voltage Value...
  • Page 79 GSM/GPRS Module Series M66 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 36: Description of Different Coding Schemes Radio Block Data Code...
  • Page 80 GSM/GPRS Module Series M66 Hardware Design Radio block structure of CS-4 is shown as the following figure. Radio Block Block No coding Code 456 bits Figure 52: Radio Block Structure of CS-4 M66_Hardware_Design Confidential / Released 79 / 80...
  • Page 81 GSM/GPRS Module Series M66 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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