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M12 Hardware Design

M12_Hardware_Design_V3.3

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3.3. Power supply

3.3.1. Power features of module

The power supply is one of the key issues in the designing GSM terminals. Due to the 577us radio

burst emission 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 M12 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.

Vdrop

4.615ms

577us

IBAT

VBAT

Burst:1.6A

Figure 3: Voltage ripple during transmitting

3.3.2. Decrease supply voltage drop

The power supply rang 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 capacitors 100nF, 33pF and 10 pF 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

occurring 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.

Quectel

Confidential

Summary of Contents for M12

Page 1: ...M12 Quectel Cellular Engine Hardware Design M12_Hardware_Design_V3 3 ...

Page 2: ...ustomer s possession Furthermore system validation of this product designed by Quectel within a larger electronic system remains the responsibility of the customer or the customer s system integrator All specifications supplied herein are subject to change Copyright This document contains proprietary technical information of Quectel Co Ltd Copying of this document distribution to others and commun...

Page 3: ...ign for power supply 26 3 3 4 Monitor power supply 27 3 4 Power up and power down scenarios 27 3 4 1 Power on module using PWRKEY pin 27 3 4 2 Power down 29 3 4 3 Restart module using PWRKEY pin 32 3 5 Power saving 33 3 5 1 Minimum functionality mode 34 3 5 2 SLEEP mode slow clock mode 34 3 5 3 Wake up module from SLEEP mode 34 c3 6 Summary of state transitions 35 3 7 RTC backup 35 3 8 Serial inte...

Page 4: ...t power 62 4 3 RF receiving sensitivity 62 4 4 Operating frequencies 62 4 5 Recommendation of RF pad welding 62 5 Electrical reliability and radio characteristics 64 5 1 Absolute maximum ratings 64 5 2 Operating temperature 64 5 3 Power supply ratings 65 5 4 Current consumption 66 5 5 Electro static discharge 67 6 Mechanical dimensions 68 6 1 Mechanical dimensions of the module 68 6 2 Footprint of...

Page 5: ...N OF MOLEX SIM CARD HOLDER 54 TABLE 16 PIN DEFINITION OF THE ADC 55 TABLE 17 CHARACTERISTICS OF THE ADC 55 TABLE 18 BEHAVIORS OF THE RI 55 TABLE 19 WORKING STATE OF THE NETLIGHT 57 TABLE 20 PIN DEFINITION OF THE STATUS 58 TABLE 21 PIN DEFINITION OF THE GPIO INTERFACE 58 TABLE 22 PIN DEFINITION OF THE SD CARD INTERFACE 59 TABLE 23 PIN NAME OF THE SD CARD AND T FLASH MICRO SD CARD 60 TABLE 24 PIN DE...

Page 6: ...NCTIONAL UART PORT 40 FIGURE 19 CONNECTION OF THREE LINES UART PORT 40 FIGURE 20 CONNECTION OF UART PORT WITH HARDWARE FLOW CONTROL 41 FIGURE 21 CONNECTION OF FIRMWARE UPGRADE 41 FIGURE 22 CONNECTION OF DEBUG PORT 42 FIGURE 23 CONNECTION OF UART3 PORT 43 FIGURE 24 3 3V LEVEL MATCH CIRCUIT 43 FIGURE 25 5V LEVEL MATCH CIRCUIT 44 FIGURE 26 RS232 LEVEL MATCH CIRCUIT 45 FIGURE 27 MICROPHONE REFERENCE D...

Page 7: ...ION OF RF PAD WELDING 63 FIGURE 46 M12 TOP AND SIDE DIMENSIONS UNIT MM 68 FIGURE 47 M12 BOTTOM DIMENSIONS UNIT MM 69 FIGURE 48 PAD BOTTOM DIMENSIONS UNIT MM 69 FIGURE 49 FOOTPRINT OF RECOMMENDATION UNIT MM 71 FIGURE 50 TOP VIEW OF THE MODULE 72 FIGURE 51 BOTTOM VIEW OF THE MODULE 72 FIGURE 52 RADIO BLOCK STRUCTURE OF CS 1 CS 2 AND CS 3 73 FIGURE 53 RADIO BLOCK STRUCTURE OF CS 4 73 Quectel Confiden...

Page 8: ...munication mode 3 Disabled the module hardware flow control status by default 3 2 2012 04 16 Layne YE 1 Deleted the alarm function and relevant AT Commands 2 Deleted the function content of keyboard pins 3 Deleted the function content of Light_MOS pin 4 Deleted the FAX function 5 Deleted the echo cancellation function 6 Modified the keyboard pins as RESERVED 7 Modified the name of GPIO1_KBC5 pin t...

Page 9: ...exing protocol 5 GSM 07 05 Digital cellular telecommunications Phase 2 Use of Data Terminal Equipment Data Circuit terminating Equipment DTE DCE interface for Short Message Service SMS and Cell Broadcast Service CBS 6 GSM 11 14 Digital cellular telecommunications Phase 2 Specification of the SIM Application Toolkit for the Subscriber Identity module Mobile Equipment SIM ME interface 7 GSM 11 11 Di...

Page 10: ...tal Signal Processor DCE Data Communications Equipment typically module DTE Data Terminal Equipment typically computer external controller DTR Data Terminal Ready DTX Discontinuous Transmission EFR Enhanced Full Rate EGSM Enhanced GSM EMC Electromagnetic Compatibility ESD Electrostatic Discharge ETS European Telecommunication Standard FCC Federal Communications Commission U S FDMA Frequency Divisi...

Page 11: ...nsmitter URC Unsolicited Result Code USSD Unstructured Supplementary Service Data VSWR Voltage Standing Wave Ratio Vmax Maximum Voltage Value Vnorm Normal Voltage Value Vmin Minimum Voltage Value VIHmax Maximum Input High Level Voltage Value VIHmin Minimum Input High Level Voltage Value VILmax Maximum Input Low Level Voltage Value VILmin Minimum Input Low Level Voltage Value VImax Absolute Maximum...

Page 12: ...the cellular terminal or mobile before boarding an aircraft Make sure it switched off The operation of wireless appliances in an aircraft is forbidden to prevent interference with communication systems Forget to think much of these instructions may lead to the flight safety or offend against local legal action or both Do not operate the cellular terminal or mobile in the presence of flammable gas ...

Page 13: ...er using emergency call In order to make or receive call the cellular terminal or mobile must be switched on and in a service area with adequate cellular signal strength Some networks do not allow for emergency call if certain network services or phone features are in use e g lock functions fixed dialing etc You may have to deactivate those features before you can make an emergency call Also some ...

Page 14: ...ing technique the current consumption of M12 is as low as 1 3 mA in SLEEP mode when DRX is 5 M12 is integrated with Internet service protocols which are TCP UDP FTP and HTTP Extended AT commands have been developed for customer to use these Internet service protocols easily The modules are fully RoHS compliant to EU regulation 2 1 Key features Table 3 Module key features Feature Implementation Pow...

Page 15: ...Audio features Speech codec modes Half Rate ETS 06 20 Full Rate ETS 06 10 Enhanced Full Rate ETS 06 50 06 60 06 80 Adaptive Multi Rate AMR Echo Suppression Noise Reduction Serial interface Serial Port Seven lines on serial port interface Used for AT command GPRS data and CSD data Multiplexing function Support autobauding from 4800 bps to 115200 bps Debug Port Two lines on second serial port interf...

Page 16: ...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 2 Functional diagram The following figure shows a block diagram of M12 and illustrates the major functional parts Power management Baseband Serial Flash The GSM radio frequency part The Peripheral interface Power supply Turn on off interface UART interface Audio interface SIM interfa...

Page 17: ... GPIO Status Netlight UART Audio Reset ESD PMU Figure 1 Module functional diagram 2 3 Evaluation board In order to help customer on the application of M12 Quectel supplies an Evaluation Board EVB that hosts the module directly with appropriate power supply SIM card holder RS 232 serial interface handset RJ11 port earphone port antenna and other peripherals to control or test the module For more de...

Page 18: ...d in detail in the following chapters Power supply refer to Section 3 3 Serial interfaces refer to Section 3 8 Audio interfaces refer to Section 3 9 SIM interface refer to Section 3 10 SD interface refer to Section 3 16 Electrical and mechanical characteristics of the SMT pad are specified in Chapter 5 Chapter6 3 1 Pins of module 3 1 1 Pin assignment The following figure shows pin name and assignm...

Page 19: ... description Table 5 Pin description Power supply PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT VBAT 50 51 52 I Module main power supply VBAT 3 3V 4 6V Vmax 4 6V Vmin 3 3V Vnorm 4 0V It must be able to provide sufficient current in a transmitting burst which typically Quectel Confidential ...

Page 20: ...r when using for power supply GND 8 42 44 49 Digital ground Turn on off PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT PWRKEY 18 I Power on off key PWRKEY should be pulled down for a moment to turn on or off the system VILmax 0 1 VBAT VIHmin 0 6 VBAT VImax VBAT Pulled up to VBAT internally Emergency shutdown PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT EMERG_ OFF 17 I Eme...

Page 21: ...cs refer to Chapter 3 9 If unused keep these pins open MIC2P MIC2N 25 26 I Auxiliary positive and negative voice band input SPK1P SPK1N 22 21 O Positive and negative voice band output SPK2P 20 O Auxiliary positive voice band output AGND 19 Analog ground Separate ground connection for external audio circuits General purpose input output PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT GPI...

Page 22: ...a carrier detection Debug port DBG_TXD 10 O Serial interface for debugging only Same as above If unused keep these pins open DBG_RXD 9 I UART3 TXD3 62 O Transmit data Same as above If unused keep these pins open RXD3 63 I Receive data SD card interface PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT SD_DATA 1 I O SD serial data VILmin 0 3V VILmax 0 25 VDD_EXT VIHmin 0 75 VDD_EXT VIHmax ...

Page 23: ...lder SIM_DATA 13 I O SIM data SIM_VDD 3V VILmax 0 4V VIHmin SIM_VDD 0 4 VOLmax 0 4V VOHmin SIM_VDD 0 4 SIM_VDD 1 8V VILmax 0 15 SIM_VDD VIHmin SIM_VDD 0 4 VOLmax 0 15 SIM_VDD VOHmin SIM_VDD 0 4 SIM_CLK 14 O SIM clock SIM_VDD 3V VILmax 0 4V VIHmin 0 9 SIM_VDD VOLmax 0 4V VOHmin 0 9 SIM_VDD SIM_VDD 1 8V VILmax 0 12 SIM_VDD VIHmin 0 9 SIM_VDD VOLmax 0 12 SIM_VDD VOHmin 0 9 SIM_VDD SIM_RST 15 O SIM re...

Page 24: ... COMMENT ADC0 41 I General purpose analog to digital converter Voltage range 0V 2 8V If unused keep this pin open ADC1 40 I RF interface PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT RF_ANT 43 I O RF antenna pad Impedance of 50Ω Refer to Chapter 4 Other interfaces PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT RESERVED 4 5 27 37 39 53 Keep these pins open 3 2 Operating mod...

Page 25: ...ADY The PDP context is active but no data transfer is ongoing The module is ready to receive or send GPRS data The SGSN knows the cell where the module is located at GPRS DATA There is GPRS data in transfer In this mode power consumption is decided by the PCL working RF band and GPRS multi slot configuration POWER DOWN1 Normal shutdown by sending the AT QPOWD 1 command using the PWRKEY or the EMER...

Page 26: ...nsmit burst does not exceed 400mV Vdrop 4 615ms 577us IBAT VBAT Burst 1 6A Figure 3 Voltage ripple during transmitting 3 3 2 Decrease supply voltage drop The power supply rang 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 performanc...

Page 27: ... If there is a big voltage difference between the input source and the desired output VBAT a switcher power converter is preferred to use as a power supply The following figure shows a reference design for 5V input power source The designed output for the power supply is 4 16V and the maximum load current is 3A In addition in order to get a stable output voltage a zener diode is placed close to th...

Page 28: ...Y pin can be released Customer can monitor the level of the STATUS pin to judge whether the module is power on or not Note The module is set to autobauding mode AT IPR 0 in default configuration In the autobauding mode the URC RDY is not sent to host controller after powering on AT command can be sent to the module 2 3 seconds after the module is powered on Host controller should firstly send an A...

Page 29: ...using a button directly A TVS component is indispensable to be placed nearby the button for ESD protection When pressing the key electrostatic strike may generate from finger A reference circuit is showed in Figure 7 PWRKEY S1 Close to S1 TVS Figure 7 Turn on the module using keystroke The power on scenarios is illustrated as the following figure Quectel Confidential ...

Page 30: ...he STATUS pin to judge whether the module is turned on After the STATUS pin goes to high level PWRKEY could be released If the STATUS pin is ignored pull the PWRKEY pin to low level for more than 2 seconds to turn on the module 3 4 2 Power down The following procedures can be used to turn off the module Normal power down procedure Turn off module using the PWRKEY pin Normal power down procedure Tu...

Page 31: ...ctive and DTE and DCE are not correctly synchronized after start up The module is recommended to set a fixed baud rate After this moment no other AT commands can be executed And then the module enters the POWER DOWN mode only the RTC is still active The POWER DOWN mode can also be indicated by the STATUS pin which is a low level voltage in this mode VBAT PWRKEY INPUT STATUS OUTPUT EMERG_OFF INPUT ...

Page 32: ...G 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 shutdown 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 OVER_VOLTAGE POWER DOWN Note These result codes do not appear when autobauding is active and DTE and DCE are not correctly sy...

Page 33: ...r instance if the module is unresponsive or abnormal the pin EMERG_OFF could be used to shutdown the system Although turning off the module by EMERG_OFF is fully tested and nothing wrong is detected this operation is still a big risk as it could cause destroying of the code or data area of the NOR flash memory in the module Therefore it is recommended that PWRKEY or AT command should always be the...

Page 34: ...of restarting system The module can also be restarted by the PWRKEY after emergency shutdown The restart scenario is illustrated as the following figure EMERG_OFF INPUT STATUS OUTPUT Delay 2s 6us Pulldown 20ms PWRKEY INPUT Figure 13 Timing of restarting system after emergency shutdown 3 5 Power saving Upon system requirement there are several actions to drive the module to enter low current consum...

Page 35: ...set by AT CFUN 0 or AT CFUN 4 it can return to full functionality by AT CFUN 1 For detailed information about AT CFUN please refer to document 1 3 5 2 SLEEP mode slow clock mode The SLEEP mode is disabled in default software configuration Customer s application can enable this mode by AT QSCLK 1 On the other hand the default setting is AT QSCLK 0 and in this mode the module can not enter SLEEP mod...

Page 36: ... pin Use AT command AT QSCLK 1 and pull DTR up Sleep mode Use PWRKEY pin or use EMERG_OFF pin Pull DTR down or incoming call or SMS or GPRS data transmission 3 7 RTC backup The RTC Real Time Clock can be supplied by an external capacitor or battery rechargeable or non chargeable through the pin VRTC A 1 5K resistor has been integrated in the module for current limiting A coin cell battery or a sup...

Page 37: ...ackup Battery Module RTC Core 1 5K Figure 15 RTC supply from rechargeable battery VRTC Large Capacitance Capacitor Module RTC Core 1 5K Figure 16 RTC supply from capacitor Coin type rechargeable capacitor such as XH414H IV01E from Seiko can be used Quectel Confidential ...

Page 38: ...from TXD of DTE RTS Requests to send CTS Clear to send DTR DTE is ready and inform DCE this pin can wake the module up RI Ring indicator when the call SMS data of the module are coming the module will output signal to inform DTE DCD Data carrier detection The validity of this pin demonstrates the communication link is set up Note The module disables hardware flow control by default When hardware f...

Page 39: ...t DBG_TXD 10 Transmit data of the debug port UART Port RI 55 Ring indicator RTS 58 Request to send CTS 57 Clear to send RXD 61 Receive data of the serial port TXD 60 Transmit data of the serial port DTR 59 Data terminal ready DCD 56 Data carrier detection UART3 Port TXD3 62 Transmit data of UART3 RXD3 63 Receive data of UART3 3 8 1 UART Port 3 8 1 1 The features of UART Port Seven lines on UART in...

Page 40: ...enabled it is recommended to wait 2 to 3 seconds before sending the first AT string After receiving the OK response DTE and DCE are correctly synchronized 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 factor...

Page 41: ...odulation TXD RXD RTS CTS DTR DCD RI TXD RXD RTS CTS DTR DCD RING Module DCE Serial port Serial Port GND GND PC DTE Figure 18 Connection of all functional UART port Three lines connection is shown as below TXD RXD GND UART PORT RTS 0R TXD RXD GND Module DCE Host DTE Controller Figure 19 Connection of three lines UART port UART Port with hardware flow control is shown as below This connection will ...

Page 42: ...rmware The PWRKEY pin must be pulled down before the firmware upgrade Please refer to the following figure for firmware upgrade IO Connector TXD RXD GND PWRKEY Module DCE UART port TXD RXD GND PWRKEY Figure 21 Connection of firmware upgrade 3 8 2 Debug Port Debug Port Two lines DBG_TXD and DBG_RXD It outputs log information automatically Debug Port is only used for software debugging and its baud ...

Page 43: ...T command only and does not support GPRS data CSD Multiplexing function etc UART3 supports the communication baud rates as the following 4800 9600 14400 19200 28800 38400 57600 115200 The default baud rate setting is 115200bps and autobauding is not supported The baud rate can be modified by AT QSEDCB command For more details please refer to document 1 Host DTE Controller TXD RXD GND Module DCE TX...

Page 44: ...TS DTR RI RTS CTS GPIO EINT GPIO DCD Module 1K 1K Voltage level 3 3V 5 6K 5 6K 5 6K 1K 1K 1K 1K GND GND Figure 24 3 3V level match circuit The reference design of 5V level match is shown as below The construction of dotted line can refer to the construction of solid line Please pay attention to direction of connection Input dotted line of the module should refer to input solid line of the module O...

Page 45: ...DCD Module GPIO EINT VCC_MCU Voltage level 5V 4 7K GND Figure 25 5V level match circuit The following picture is an example of connection between module and PC A RS232 level shifter IC or circuit must be inserted between module and PC since these three UART ports do not support the RS232 level while support the CMOS level only Quectel Confidential ...

Page 46: ...CD Figure 26 RS232 level match circuit 3 9 Audio interfaces The module provides two analogy input channels and two analogy output channels Table 10 Pin definition of Audio interface Interface Name Pin Function AIN1 AOUT1 MIC1P 23 Microphone1 input MIC1N 24 Microphone1 input SPK1P 22 Audio1 output SPK1N 21 Audio1 output AIN2 AOUT2 MIC2P 25 Microphone2 input MIC2N 26 Microphone2 input SPK2P 20 Audio...

Page 47: ...ransmitting at GSM900MHz TDD noise could be heard without this capacitor 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 Therefore customer would have to discuss with its capacitor vendor to choose the most suitable capacitor for filtering out GSM900MHz and DCS...

Page 48: ...3pF 0603 33pF 0603 GND 10pF 0603 10pF 0603 ESD ESD 10pF 0603 33pF 0603 Figure 27 Microphone reference design for AIN1 AIN2 3 9 3 Receiver and speaker interface configuration SPK1P SPK1N Differential layout Module 10pF 0603 Close to speaker GND ESD 33pF 0603 33pF 0603 GND 10pF 0603 ESD 10pF 0603 33pF 0603 Figure 28 Reference design for AOUT1 Quectel Confidential ...

Page 49: ...3 ESD 10pF 0603 33pF 0603 Figure 29 Reference design with an amplifier for AOUT1 Texas Instruments TPA6205A1 is recommended for a suitable differential audio amplifier There are plenty of excellent audio amplifiers in the market SPK2P AGND Differential layout Module 22uF Close to speaker GND ESD 33pF 0603 10pF 0603 Figure 30 Reference design for AOUT2 Quectel Confidential ...

Page 50: ...mpedance of audio amplifier 3 9 4 Earphone interface configuration Amphenol 9001 8905 050 1 2 4 3 SPK2P MIC2N MIC2P 22uF 68R AGND Close to Socket Differential layout AGND AGND Module 4 7uF ESD GND 33pF 0603 10pF 0603 33pF 0603 GND 10pF 0603 ESD Figure 32 Reference design for an earphone Table 11 Typical electret microphone characteristic Parameter Min Typ Max Unit Working Voltage 1 2 1 5 2 0 V Wor...

Page 51: ...is powered from an internal regulator in the module Both 1 8V and 3 0V SIM Cards are supported Table 13 Pin definition of the SIM interface Figure 33 is the reference circuit for SIM interface and here an 8 pin SIM card holder is used The pin SIM_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 When the tray is ins...

Page 52: ...is inserted into SIM socket again and the module finishes re initialization SIM card the following URC will be presented Call Ready Module SIM_VDD SIM_RST SIM_CLK SIM_DATA SIM_PRESENCE 22R 22R 22R VDD_EXT 10K 100nF SIM_Holder GND GND ESDA6V8V6 33pF 33pF 33pF 33pF VCC RST CLK IO VPP GND GND GND Figure 33 Reference circuit of the 8 pins SIM card Note Please do not use AT QSIMDET 1 1 which causes to ...

Page 53: ...cross talk from the SIM_CLK signal to the SIM_DATA signal be careful that both lines are not placed closely next to each other So each of SIM_DATA and SIM_CLK line should be shield by ground For good performance the SIM_RST line also should be protected by the ground In order to ensure good ESD protection it is recommended to add TVS such as WILL http www willsemi com ESDA6V8AV6 The capacitance of...

Page 54: ...f Amphenol SIM card holder Name Pin Function SIM_VDD C1 SIM Card Power supply SIM_RST C2 SIM Card Reset SIM_CLK C3 SIM Card Clock GND C5 Ground VPP C6 Not Connect SIM_DATA C7 SIM Card data I O For 8 pin SIM card holder it is recommended to use Molex 91228 Please visit http www molex com for more information Quectel Confidential ...

Page 55: ...d SIM_DATA C7 SIM Card Data I O SIM_DETECT C8 Pulled down GND with external circuit When the tray is present C4 is connected to C8 3 11 ADC The module provides two auxiliary ADC interfaces to measure the values of two analog inputs AT command AT QADC reads the voltage value present on the ADC0 pin AT command AT QEADC reads the voltage value present on the ADC1 pin It is suggested that ADC0 channel...

Page 56: ...RIER as an URC then changes to HIGH again 4 Changed to HIGH when SMS is received Data calling Changed to LOW then 1 Changed to HIGH when data connection is established 2 Use ATH to hang up the data calling RI changes to HIGH 3 Calling part hangs up RI changes to HIGH first and changes to LOW for 120ms indicating NO CARRIER as an URC then changes to HIGH again 4 Changed to HIGH when SMS is received...

Page 57: ...eceived HIGH LOW Figure 37 RI behaviour of voice calling as a receiver RI Idle Ring Data calling establish SMS received HIGH LOW On hook by ATH Figure 38 RI behaviour of data calling as a receiver RI Idle Calling On hook Talking HIGH LOW Idle Figure 39 RI behaviour as a caller Quectel Confidential ...

Page 58: ...ing state of this pin is listed in Table 19 Table 19 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 64ms On 600ms Off GPRS data transmission is ongoing A reference circuit is shown in the following figure Module NETLIGHT 4 7K 47K 300R VBAT Figu...

Page 59: ...K 47K 300R VBAT Figure 42 Reference circuit of the STATUS 3 15 General purpose input output GPIO The module provides a limited number of General Purpose Input Output signal pins The driving capability of these pins is 4mA Every GPIO can be configured as input or output by AT command For details please refer to document 1 Table 21 Pin definition of the GPIO interface Name Pin Function STATUS 54 Ind...

Page 60: ...shown in figure 43 the users can easily design the SD card application circuit to enhance the memory capacity of the module The users can store some high capacity files to external memory card Such as in the automotive application system the module can record and store the audio file to the SD card and also can play the audio files in SD card Table 22 Pin definition of the SD card interface Module...

Page 61: ...m The SD_CLK and SD_DATA and SD_CMD trace should be routed together Keep trace difference of SD_DATA SD_CMD and SD_CLK to be less than 10mm In order to ensure good ESD protection it is recommended to add TVS on signal pins with the capacitance less than 15pF Reserve external pull up resistor for other data lines except the DATA0 signal The SD_CLK and SD_DATA line must be shielded by ground in orde...

Page 62: ...vides an RF antenna PAD for customer s antenna connection The RF trace in host PCB connected to the module s RF antenna pad should be coplanar waveguide line or microstrip line which characteristic impedance should be close to 50Ω M12 comes with two grounding pads which are next to the antenna pad in order to give a better grounding Table 24 Pin definition of the RF_ANT To minimize the loss on the...

Page 63: ...tivity Table 26 The module conducted RF receiving sensitivity Frequency Receiving sensitivity EGSM900 108 5dBm DCS1800 108 5dBm 4 4 Operating frequencies Table 27 The module operating frequencies Frequency Receive Transmit ARFCH EGSM900 925 960MHz 880 915MHz 0 124 975 1023 DCS1800 1805 1880MHz 1710 1785MHz 512 885 4 5 Recommendation of RF pad welding If external antenna is connected with RF cable ...

Page 64: ...M12 Hardware Design M12_Hardware_Design_V3 3 63 Figure 45 Recommendation of RF pad welding Quectel Confidential ...

Page 65: ...ply during one TDMA frame 0 0 7 A Voltage at digital pins 0 3 3 3 V Voltage at analog pins 0 3 3 0 V Voltage at digital analog pins in POWER DOWN mode 0 25 0 25 V 5 2 Operating temperature The operating temperature is listed in the following table Table 29 Operating temperature Parameter Min Typ Max Unit Normal temperature 35 25 75 Restricted operation1 40 to 35 75 to 80 Storage temperature 45 85 ...

Page 66: ...e ripple Maximum power control level on GSM850 and GSM900 f 200kHz f 200kHz 50 2 mV mV IVBAT Average supply current POWER DOWN mode SLEEP mode DRX 5 29 1 3 uA mA Minimum functionality mode AT CFUN 0 IDLE mode SLEEP mode AT CFUN 4 IDLE mode SLEEP mode 13 0 98 13 1 0 mA mA mA mA IDLE mode EGSM900 DCS1800 13 13 mA mA TALK mode EGSM9001 DCS18002 220 197 mA mA DATA mode GPRS 3 Rx 2Tx EGSM9001 DCS18002 ...

Page 67: ...Typical 73mA DCS1800 power level 0 230mA Typical 197mA power level 7 Typical 94mA power level 15 Typical 70mA GPRS Data DATA mode GPRS 1 Rx 1 Tx CLASS 12 EGSM 900 power level 5 350mA Typical 193mA power level 12 Typical 84mA power level 19 Typical 63mA DCS 1800 power level 0 300mA Typical 185mA power level 7 Typical 82mA power level 15 Typical 60mA DATA mode GPRS 3 Rx 2 Tx CLASS 12 EGSM 900 power ...

Page 68: ...A Note GPRS Class 12 is the default setting The module can be configured from GPRS Class 1 to Class 12 by AT QGPCLASS Setting to lower GPRS class would make it easier to design the power supply for the module 5 5 Electro static discharge Although the GSM engine is generally protected against Electrostatic Discharge ESD precautions about ESD protection should still be emphasized Proper ESD handling...

Page 69: ...M12_Hardware_Design_V3 2 68 6 Mechanical dimensions This chapter describes the mechanical dimensions of the module 6 1 Mechanical dimensions of the module Figure 46 M12 top and side dimensions Unit mm Quectel Confidential ...

Page 70: ...M12 Hardware Design M12_Hardware_Design_V3 2 69 test point Figure 47 M12 bottom dimensions Unit mm Figure 48 Pad bottom dimensions Unit mm Quectel Confidential ...

Page 71: ...M12 Hardware Design M12_Hardware_Design_V3 2 70 6 2 Footprint of recommendation single pad Quectel Confidential ...

Page 72: ...elow the test point in the host PCB Place solder mask Note2 In order to maintain the module keep about 3mm between the module and other components in host PCB Note3 Keep out area in above figure in which is forbid to pour ground copper Since the RF test point in this area avoid generating parasitic capacitance between RF test point and ground Quectel Confidential ...

Page 73: ...M12 Hardware Design M12_Hardware_Design_V3 2 72 6 3 Top view of the module Figure 50 Top view of the module 6 4 Bottom view of the module Figure 51 Bottom view of the module Quectel Confidential ...

Page 74: ...unctured Bits Data Rate Kb s CS 1 1 2 3 3 181 40 4 456 0 9 05 CS 2 2 3 3 6 268 16 4 588 132 13 4 CS 3 3 4 3 6 312 16 4 676 220 15 6 CS 4 1 3 12 428 16 456 21 4 Radio block structure of CS 1 CS 2 and CS 3 is shown as Figure 52 Figure 52 Radio block structure of CS 1 CS 2 and CS 3 Radio block structure of CS 4 is shown as Figure 53 Figure 53 Radio block structure of CS 4 Rate 1 2 Convolutional Codin...

Page 75: ...icates the amount of downlink timeslots while the second number indicates the amount of uplink timeslots The active slots determine the total number of slots the GPRS device can use simultaneously for both uplink and downlink communications The description of different multi slot classes of the M12 module support is shown in Table 34 Table 34 GPRS multi slot classes Multislot Class Downlink Slots ...

Page 76: ...M12 Hardware Design M12_Hardware_Design_V3 2 75 Shanghai Quectel Wireless Solutions Co Ltd Room 501 Building 13 No 99 Tianzhou Road Shanghai China 200233 Tel 86 21 5108 6236 Mail info quectel com ...

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