M26 Hardware Design GSM/GPRS Module Series Rev. M26_Hardware_Design_V1.1 Date: 2014-11-24 www.quectel.
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GSM/GPRS Module Series M26 Hardware Design About the Document History Revision Date Author Description 1.0 2014-08-07 Felix YIN Initial Felix YIN 1. Modified output power of Bluetooth 2. Modified the timing of the RFTXMON signal 3. Updated Figure 5: Reference circuit for power supply 4. Modified description of RTC and SIM card interface 5. Modified description of UART Application 6. Deleted the over-voltage automatic shutdown function 7. Modified the antenna gain in the Table 24 8.
GSM/GPRS Module Series M26 Hardware Design Contents About the Document ................................................................................................................................... 2 Contents ....................................................................................................................................................... 3 Table Index ...................................................................................................................................
GSM/GPRS Module Series M26 Hardware Design 3.7.1.3. Firmware Upgrade ............................................................................................. 36 3.7.2. Debug Port ..................................................................................................................... 37 3.7.3. Auxiliary UART Port ....................................................................................................... 38 3.7.4. UART Application ................................................
GSM/GPRS Module Series M26 Hardware Design 7.3. Packaging ................................................................................................................................ 71 7.3.1. Tape and Reel Packaging .............................................................................................. 72 8 Appendix A Reference....................................................................................................................... 73 9 Appendix B GPRS Coding Scheme ..........
GSM/GPRS Module Series M26 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 ...............................................
GSM/GPRS Module Series M26 Hardware Design Figure Index FIGURE 1: MODULE FUNCTIONAL DIAGRAM ............................................................................................... 14 FIGURE 2: PIN ASSIGNMENT ......................................................................................................................... 16 FIGURE 3: VOLTAGE RIPPLE DURING TRANSMITTING ..............................................................................
GSM/GPRS Module Series M26 Hardware Design FIGURE 42: REFERENCE DESIGN FOR BLUETOOTH ANTENNA ............................................................... 60 FIGURE 43: M26 MODULE TOP AND SIDE DIMENSIONS (UNIT: MM) ......................................................... 66 FIGURE 44: M26 MODULE BOTTOM DIMENSIONS (UNIT: MM) ................................................................... 67 FIGURE 45: RECOMMENDED FOOTPRINT (UNIT: MM) ...................................................................
GSM/GPRS Module Series M26 Hardware Design 1 Introduction This document defines the M26 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 note and user guide, you can use M26 module to design and set up mobile applications easily.
GSM/GPRS Module Series M26 Hardware Design 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 M26 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.
GSM/GPRS Module Series M26 Hardware Design 2 Product Concept 2.1. General Description M26 is a Quad-band GSM/GPRS engine that works at frequencies of GSM850MHz, EGSM900MHz, DCS1800MHz and PCS1900MHz. The M26 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 15.8mm × 17.7mm × 2.
GSM/GPRS Module Series M26 Hardware Design 2.2. Key Features The following table describes the detailed features of M26 module. Table 1: Module Key Features Feature Implementation Power Supply Single supply voltage: 3.3V ~ 4.6V Typical supply voltage: 4V Power Saving Typical power consumption in SLEEP mode: 1.3 mA @DRX=5 1.
GSM/GPRS Module Series M26 Hardware Design Enhanced Full Rate (ETS 06.50/06.60/06.
GSM/GPRS Module Series M26 Hardware Design 2.3. Functional Diagram The following figure shows a block diagram of M26 and illustrates the major functional parts.
GSM/GPRS Module Series M26 Hardware Design 3 Application Interface The module adopts LCC package and has 44 pins. The following chapters provide detailed descriptions about these pins.
GSM/GPRS Module Series M26 Hardware Design 3.1. Pin of Module VRTC VBAT VBAT GND GND DBG_TXD DBG_RXD GND GND 44 43 42 41 40 39 38 37 36 3.1.1.
GSM/GPRS Module Series M26 Hardware Design 3.1.2. Pin Description Table 3: IO Parameters Definition Type Description IO Bidirectional input/output DI Digital input DO Digital output PI Power input PO Power output AI Analog input AO Analog output Table 4: Pin Description Power Supply PIN Name VBAT VRTC VDD_ EXT PIN No. 42,43 44 24 I/O PI IO PO M26_Hardware_Design Description DC Characteristics Comment VImax=4.6V VImin=3.3V VInorm=4.
GSM/GPRS Module Series M26 Hardware Design 2.2~4.7uF bypass capacitor, when using this pin for power supply. GND 27,34 36,37 40,41 Ground Turn on/off PIN Name PWRKEY PIN No. 7 I/O Description DC Characteristics DI Power on/off key. PWRKEY should be pulled down for a moment to turn on or turn off the system. VILmax= 0.1×VBAT VIHmin= 0.6×VBAT VIHmax=3.1V Comment Audio Interface PIN Name PIN No.
GSM/GPRS Module Series M26 Hardware Design If only use TXD, RXD and GND to communicate, recommended to keep other pins open. Request to send VILmin=0V VILmax= 0.25×VDD_EXT VIHmin= 0.75×VDD_EXT VIHmax= VDD_EXT+0.2 VOHmin= 0.85×VDD_EXT VOLmax= 0.15×VDD_EXT I/O Description DC Characteristics Comment DO Transmit data Same as above If unused, keep these pins open. DC Characteristics Comment Same as above If unused, keep these pins open.
GSM/GPRS Module Series M26 Hardware Design SIM_ RST 12 SIM_ GND 10 DO VOLmax= 0.15×SIM_VDD VOHmin= 0.85×SIM_VDD SIM reset SIM ground ADC PIN Name I/O Description DC Characteristics Comment PO Reference voltage of ADC circuit VOmax=2.9V VOmin=2.7V VOnorm=2.8V If unused, keep this pin open. 9 AI General purpose analog to digital converter. Voltage range: 0V to 2.8V If unused, keep this pin open. PIN Name PIN No.
GSM/GPRS Module Series M26 Hardware Design 0.15×VDD_EXT Other Interface PIN Name PIN No. RESERVED 15 I/O Description DC Characteristics Comment Keep these pins open. 3.2. Operating Modes The table below briefly summarizes the various operating modes in the following chapters.
GSM/GPRS Module Series M26 Hardware Design POWER DOWN Normal shutdown by sending the AT+QPOWD=1 command or using the PWRKEY pin. The power management ASIC disconnects the power supply from the base band part of the module, and only the power supply for the RTC is remained. Software is not active. The UART interfaces are not accessible. Operating voltage (connected to VBAT) remains applied.
GSM/GPRS Module Series M26 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. 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.
GSM/GPRS Module Series M26 Hardware Design MIC29302WU U1 DC_IN VBAT 470uF 5 ADJ R1 51K 3 GND C2 OUT 4 EN C1 1 2 IN R2 124K R4 R3 56K 100nF 470R C3 470uF C4 D1 100nF 5.1V R5 4.7K MCU_POWER_ON/OFF R6 47K 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. Power switch circuit like P-channel MOSFET switch circuit can also be used to control VBAT.
GSM/GPRS Module Series M26 Hardware Design PWRKEY 4.7K Turn on pulse 47K Figure 6: Turn on the Module with an Open-collector Driver NOTE 1. M26 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.
GSM/GPRS Module Series M26 Hardware Design The turn-on timing is illustrated as the following figure. T1 VBAT >1s VIH > 0.6*VBAT PWRKEY (INPUT) VIL<0.1*VBAT 54ms VDD_EXT (OUTPUT) MODULE STATUS OFF BOOTING RUNNING Figure 8: Turn-on Timing NOTE Make sure that VBAT is stable before pulling down PWRKEY pin. The time of T1 is recommended to be 100ms. 3.4.2.
GSM/GPRS Module Series M26 Hardware Design VBAT PWRKEY (INPUT) 0.7s
GSM/GPRS Module Series M26 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 URC will be presented: UNDER_VOLTAGE WARNING The normal input voltage range is from 3.3V to 4.6V. If the voltage is <3.3V, the module would automatically shut down itself. If the voltage is <3.
GSM/GPRS Module Series M26 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. 3.5.1. Minimum Functionality Mode Minimum functionality mode reduces the functionality of the module to a minimum level.
GSM/GPRS Module Series M26 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. Receive a voice or data call from network wakes up module. Receive an SMS from network wakes up module.
GSM/GPRS Module Series M26 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. Use VBAT and VRTC as the RTC power source.
GSM/GPRS Module Series M26 Hardware Design Module RTC Core Power Supply LDO/DCDC VBAT VRTC LDO 1.5K 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/. NOTE If you want to keep an accurate real time, please keep the main power supply VBAT alive. 3.7.
GSM/GPRS Module Series M26 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. For more details, please refer to the document [1]. The Debug Port: DBG_TXD: Send data to the COM port of computer. DBG_RXD: Receive data from the COM port of computer.
GSM/GPRS Module Series M26 Hardware Design DCD 21 Data carrier detection CTS 22 Clear to send RTS 23 Request to send DBG_RXD 38 Receive data DBG_TXD 39 Transmit data RXD_AUX 28 Receive data TXD_AUX 29 Transmit data Debug Port Auxiliary UART Port 3.7.1. UART Port 3.7.1.1. The Feature of UART Port Seven lines on UART interface Contain data lines TXD and RXD, hardware flow control lines RTS and CTS, other control lines DTR, DCD and RI. Used for AT command, GPRS data, etc.
GSM/GPRS Module Series M26 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). The ―At‖ and ―aT‖ commands cannot be used. Only the strings ―AT‖ or ―at‖ can be detected (neither ―At‖ nor ―aT‖).
GSM/GPRS Module Series M26 Hardware Design Three-line connection is shown as below. Module (DCE) UART port Host (DTE) Controller TXD TXD RXD RXD GND GND 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. Module (DCE) Host (DTE) Controller TXD TXD RXD RXD RTS RTS CTS CTS GND GND Figure 16: Reference Design for UART Port with Hardware Flow Control 3.7.1.3.
GSM/GPRS Module Series M26 Hardware Design Module (DCE) IO Connector UART port TXD TXD RXD RXD GND PWRKEY GND 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. 3.7.2. Debug Port Two lines: DBG_TXD and DBG_RXD. It outputs log information automatically.
GSM/GPRS Module Series M26 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. Auxiliary UART port could be used when you send AT+QEAUART=1 string on the UART port.
GSM/GPRS Module Series M26 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. For more details about UART circuit design, please refer to document [13]. The following figure shows a sketch map between module and standard RS-232 interface. Since the electrical level of module is 2.
GSM/GPRS Module Series M26 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.
GSM/GPRS Module Series M26 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. However, the resonant frequency point of a capacitor largely depends on the material and production technique.
GSM/GPRS Module Series M26 Hardware Design 3.8.3.
GSM/GPRS Module Series M26 Hardware Design Close to Speaker GND Differential layout SPK2P Module 33pF 0603 10pF 0603 ESD 22uF AGND Figure 25: Handset Interface Design for AOUT2 Close to Speaker GND Differential layout Amplifier circuit 10pF 0603 33pF 0603 10pF 0603 33pF 0603 ESD C1 SPK2P Module AGND C2 ESD GND Figure 26: 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.
GSM/GPRS Module Series M26 Hardware Design 3.8.4. Earphone Interface Design Close to Module GND Module Close to Socket MICN 10pF 0603 33pF 0603 MICP 10pF 0603 33pF 0603 10pF 0603 33pF 0603 Differential layout GND 4.7uF 10pF 0603 33pF 0603 GND SPK2P 3 AGND 4 2 1 33pF 0603 10pF 0603 22uF AGND AGND GND Figure 27: Earphone Interface Design 3.8.5. Audio Characteristics Table 10: Typical Electret Microphone Characteristics Parameter Min. Typ. Max. Unit Working Voltage 1.2 1.
GSM/GPRS Module Series M26 Hardware Design AOUT2 Output Load resistance Load Resistance 32 Single-ended Reference level 0 2.4 Vpp 3.9. PCM Interface M26 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. Pulse-code modulation (PCM) is a converter that changes the consecutive analog audio signal to discrete digital signal.
GSM/GPRS Module Series M26 Hardware Design Sample Rate 8KHz PCM Clock/Synchronization Source PCM master mode: clock and synchronization is generated by module PCM Synchronization Rate 8KHz PCM Clock Rate PCM master mode: 256 KHz (line) PCM Synchronization Format Long/short synchronization PCM Data Ordering MSB first Zero Padding Yes Sign Extension Yes 3.9.2.
GSM/GPRS Module Series M26 Hardware Design PCM_CLK PCM_SYNC MSB PCM_OUT 12 11 10 9 8 7 6 5 4 3 2 1 0 Zero padding 8 7 6 5 4 3 2 1 0 Zero padding MSB PCM_IN 12 11 10 9 Figure 29: Long Synchronization & Zero Padding Diagram PCM_CLK PCM_SYNC MSB PCM_OUT Sign extension 12 11 10 9 8 7 6 5 4 3 2 1 0 12 11 10 9 8 7 6 5 4 3 2 1 0 MSB PCM_IN Sign extension Figure 30: Short Synchronization & Sign Extension Diagram PCM_CLK PCM_SYNC MSB PCM_OUT 12 11 10 9 8 7
GSM/GPRS Module Series M26 Hardware Design 3.9.3. Reference Design M26 can only work as a master, providing synchronization and clock source. The reference design is shown as below. Peripheral (Slave) Module (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. AT Command There are two AT commands about the configuration of PCM, listed as below. AT+QPCMON can configure operating mode of PCM.
GSM/GPRS Module Series M26 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 vol_pcm_out 0~32767 Set the output volume The voice may be distorted when this value exceeds 16384. 3.10.
GSM/GPRS Module Series M26 Hardware Design The reference circuit for a 6-pin SIM card socket is illustrated as the following figure. SIM_GND Module 100nF SIM_VDD SIM_RST SIM_CLK SIM_Holder VCC RST CLK 22R 22R GND VPP IO 22R SIM_DATA 33pF33pF 33pF 33pF TVS GND GND Figure 33: Reference Circuit for SIM Interface with the 6-pin SIM Card Holder For more information http://www.molex.com . of SIM card holder, you can visit http://www.amphenol.
GSM/GPRS Module Series M26 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]. In order to improve the accuracy of ADC, the layout of ADC should be surrounded by ground. Table 17: Pin Definition of the ADC Pin Name Pin No.
GSM/GPRS Module Series M26 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] URC 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.
GSM/GPRS Module Series M26 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 State Module Function Off The module is not running. 64ms On/800ms Off The module is not synchronized with network. 64ms On/2000ms Off The module is synchronized with network.
GSM/GPRS Module Series M26 Hardware Design 3.14. RF Transmitting Signal Indication The M26 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.
GSM/GPRS Module Series M26 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.
GSM/GPRS Module Series M26 Hardware Design 4 Antenna Interface M26 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. 4.1. GSM Antenna Interface There is a GSM antenna pad named RF_ANT for M26. Table 22: Pin Definition of the RF_ANT Pin Name Pin No. Description GND 34 Ground RF_ANT 35 GSM antenna pad GND 36 Ground GND 37 Ground 4.1.1.
GSM/GPRS Module Series M26 Hardware Design M26 provides an RF antenna pad for antenna connection. The RF trace in host PCB connected to the module RF antenna pad should be coplanar waveguide line or microstrip line, whose characteristic impedance should be close to 50Ω. M26 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.
GSM/GPRS Module Series M26 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. 4.1.3. RF Receiving Sensitivity Table 26: The Module Conducted RF Receiving Sensitivity Frequency Receive Sensitivity GSM850 < -109dBm EGSM900 < -109dBm DCS1800 < -109dBm PCS1900 < -109dBm 4.1.4.
GSM/GPRS Module Series M26 Hardware Design 4.1.5. 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 41: RF Soldering Sample 4.2. Bluetooth Antenna Interface M26 supports Bluetooth interface. Bluetooth is a wireless technology that allows devices to communicate, or transmit data or voice, wirelessly over a short distance.
GSM/GPRS Module Series M26 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: 0R BT_ANT Module NM NM Figure 42: Reference Design for Bluetooth Antenna There are some suggestions for placing components and RF trace lying for Bluetooth RF traces: Antenna matching circuit should be closed to the antenna; Keep the RF traces as 50Ω; The RF traces should be kept far
GSM/GPRS Module Series M26 Hardware Design 5 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. Max. Unit VBAT -0.3 +4.73 V Peak Current of Power Supply 0 2 A RMS Current of Power Supply (during one TDMA- frame) 0 0.7 A Voltage at Digital Pins -0.3 3.08 V Voltage at Analog Pins -0.
GSM/GPRS Module Series M26 Hardware Design Restricted Operation1) -40 ~ -35 +80 ~ +85 ℃ Storage Temperature -45 +90 ℃ NOTE 1) 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. 5.3. Power Supply Ratings Table 31: The Module Power Supply Ratings Parameter VBAT Description Conditions Min. Typ. Max.
GSM/GPRS Module Series M26 Hardware Design Peak supply current (during transmission slot) DATA mode, GPRS (4 Rx, 1Tx) GSM850/EGSM9001) DCS1800/PCS19002) 217/234 172/170 mA mA DATA mode, GPRS (1Rx, 4Tx) GSM850/EGSM9001) DCS1800/PCS19002) 458/4853) 462/439 mA mA Maximum power control level on GSM850 and EGSM900. 1.6 2 A NOTE 1. 2. 3. 1) Power control level PCL 5. Power control level PCL 0. 3) Under the GSM850 and EGSM900 spectrum, the power of 1Rx and 4Tx has been reduced. 2) 5.4.
GSM/GPRS Module Series M26 Hardware Design DATA Mode, GPRS ( 3 Rx, 2Tx ) CLASS 12 GSM850 @power level #5 <550mA, Typical 363mA @power level #12, Typical 131mA @power level #19, Typical 91mA EGSM900 @power level #5 <550mA, Typical 393mA @power level #12, Typical 132mA @power level #19, Typical 92mA DCS1800 @power level #0 <450mA, Typical 268mA @power level #7, Typical 112mA @power level #15, Typical 88mA PCS1900 @power level #0 <450mA, Typical 257mA @power level #7, Typical 119mA @power level #15, T
GSM/GPRS Module Series M26 Hardware Design GSM850 @power level #5 <660mA, Typical 457mA @power level #12, Typical 182mA @power level #19, Typical 106mA EGSM900 @power level #5 <660mA, Typical 484mA @power level #12, Typical 187mA @power level #19, Typical 109mA DCS1800 @power level #0 <530mA, Typical 461mA @power level #7, Typical 149mA @power level #15, Typical 97mA PCS1900 @power level #0 <530mA, Typical 439mA @power level #7, Typical 159mA @power level #15, Typical 99mA NOTE GPRS Class 12 is the
GSM/GPRS Module Series M26 Hardware Design 6 Mechanical Dimensions This chapter describes the mechanical dimensions of the module. 6.1.
GSM/GPRS Module Series M26 Hardware Design Figure 44: M26 Module Bottom Dimensions (Unit: mm) M26_Hardware_Design Confidential / Released 67 / 80
GSM/GPRS Module Series M26 Hardware Design 6.2. Recommended Footprint 36 1 23 14 Figure 45: Recommended Footprint (Unit: mm) NOTE 1. 2. 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. (―keepout‖ means do not pour copper on the mother board).
GSM/GPRS Module Series M26 Hardware Design 6.3. Top View of the Module Figure 46: Top View of the Module 6.4.
GSM/GPRS Module Series M26 Hardware Design 7 Storage and Manufacturing 7.1. Storage M26 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 <40ºC temperature and <90%RH. After the vacuum-sealed bag is opened, devices that need to be mounted directly must be: Mounted within 72 hours at the factory environment of ≤30ºC temperature and <60% RH. Stored at <10% RH.
GSM/GPRS Module Series M26 Hardware Design 7.2. Soldering The squeegee should push the paste on the surface of the stencil that makes the paste fill the stencil openings and penetrate to the PCB. The force on the squeegee should be adjusted so as to produce a clean stencil surface on a single pass. To ensure the module soldering quality, the thickness of stencil at the hole of the module pads should be 0.2 mm for M26.
GSM/GPRS Module Series M26 Hardware Design 7.3.1. Tape and Reel Packaging The reel is 330mm in diameter and each reel contains 250 modules.
GSM/GPRS Module Series M26 Hardware Design 8 Appendix A Reference Table 34: Related Documents SN Document Name Remark [1] Quectel_M26_AT_Commands_Manual AT commands manual [2] ITU-T Draft new recommendation V.25ter Serial asynchronous automatic dialing and control [3] GSM 07.07 Digital cellular telecommunications (Phase 2+); AT command set for GSM Mobile Equipment (ME) [4] GSM 07.10 Support GSM 07.10 multiplexing protocol GSM 07.
GSM/GPRS Module Series M26 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 [13] Quectel_GSM_Module_Digital_IO_Application_Note GSM Module Digital IO Application Note Table 35: Terms and Abbreviations Abbreviation Description ADC Analog-to-Digital Converter AMR Adaptive Multi-Rate ARP Antenna Reference Point ASIC Application Specific Integrated Circui
GSM/GPRS Module Series M26 Hardware Design DTX Discontinuous Transmission EFR Enhanced Full Rate EGSM Enhanced GSM EMC Electromagnetic Compatibility ESD Electrostatic Discharge ETS European Telecommunication Standard FCC Federal Communications Commission (U.S.) FDMA Frequency Division Multiple Access FR Full Rate GMSK Gaussian Minimum Shift Keying GPRS General Packet Radio Service GSM Global System for Mobile Communications G.
GSM/GPRS Module Series M26 Hardware Design MT Mobile Terminated N.
GSM/GPRS Module Series M26 Hardware Design VILmax Maximum Input Low Level Voltage Value VILmin Minimum Input Low Level Voltage Value VImax Absolute Maximum Input Voltage Value VInorm Absolute Normal Input Voltage Value VImin Absolute Minimum Input Voltage Value VOHmax Maximum Output High Level Voltage Value VOHmin Minimum Output High Level Voltage Value VOLmax Maximum Output Low Level Voltage Value VOLmin Minimum Output Low Level Voltage Value Phonebook Abbreviations LD SIM Last Dialing
GSM/GPRS Module Series M26 Hardware Design 9 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 USF Pre-coded USF Radio Block excl.USF and BCS BCS 1/2 3 3 181 CS-2 2/3 3 6 CS-3 3/4 3 CS-4 1 3 Scheme Code Rate CS-1 Tail Coded Bits Punctured Bits Data Rate Kb/s 40 4 456 0 9.05 268 16 4 588 132 13.4 6 312 16 4 676 220 15.
GSM/GPRS Module Series M26 Hardware Design Radio block structure of CS-4 is shown as the following figure.
GSM/GPRS Module Series M26 Hardware Design 10 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. Written as 3+1 or 2+2, the first number indicates the amount of downlink timeslots, while the second number indicates the amount of uplink timeslots.
GSM/GPRS Module Series M26 Hardware Design 11 FCC Warning Any Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
