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M50 Hardware Design

M50_HD_V2.0

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3.8. 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 super-cap can be used to backup power supply for RTC.

The following figures show various sample circuits for RTC backup.

Module

RTC Core

1.5K

VRTC

Non-chargeable

Backup Battery

Figure 14:

RTC supply from non-chargeable battery

VRTC

Rechargeable

Backup 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

Quecctel

Confidential

Summary of Contents for M50

Page 1: ...M50Hardware Design M50_HD_V2 0 1 M50 Quectel Cellular Engine Hardware Design M50_HD_V2 0 ...

Page 2: ...ion 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 this document distribution to others and communication of the conte...

Page 3: ... module 30 3 3 2 Decrease supply voltage drop 30 3 3 3 Reference design for power supply 31 3 3 4 Monitor power supply 32 3 4 Power on and down scenarios 32 3 4 1 Power on 32 3 4 2 Power down 34 3 4 3 Restart 36 3 5 Charge interface 38 3 6 Power saving 38 3 6 1 Minimum functionality mode 38 3 6 2 SLEEP mode 39 3 6 3 Wake up module from SLEEP mode 39 3 7 Summary of state transition 39 3 8 RTC backu...

Page 4: ...us indication 69 4 Antenna interface 71 4 1 RF reference design 71 4 2 RF output power 72 4 3 RF receiving sensitivity 72 4 4 Operating frequencies 72 4 5 RF cable soldering 73 5 Electrical reliability and radio characteristics 74 5 1 Absolute maximum ratings 74 5 2 Operating temperature 74 5 3 Power supply ratings 75 5 4 Current consumption 76 5 5 Electro static discharge 78 6 Mechanical dimensio...

Page 5: ...PTION OF MOLEX SIM CARD HOLDER 59 TABLE 19 PIN DEFINITION OF THE SD CARD INTERFACE 60 TABLE 20 PIN NAME OF THE SD CARD AND MICRO SD CARD 61 TABLE 21 PIN DEFINITION OF PCM INTERFACE 62 TABLE 22 CONFIGURATION 62 TABLE 23 QPCMON COMMAND DESCRIPTION 65 TABLE 24 QPCMVOL COMMAND DESCRIPTION 65 TABLE 25 PIN DEFINITION OF THE ADC 66 TABLE 26 CHARACTERISTICS OF THE ADC 66 TABLE 27 BEHAVIORS OF THE RI 66 TA...

Page 6: ...GN FOR UART PORT 44 FIGURE 20 REFERENCE DESIGN FOR UART PORTWITH HARDWARE FLOW CONTROL 45 FIGURE 21 REFERENCE DESIGN FOR FIRMWARE UPGRADE 45 FIGURE 22 REFERENCE DESIGN FOR DEBUG PORT 46 FIGURE 23 REFERENCE DESIGN FOR AUXILIARY UART PORT 47 FIGURE 24 LEVEL MATCH DESIGN FOR 3 3V SYSTEM 47 FIGURE 25 LEVEL MATCH DESIGN FOR 5V SYSTEM 48 FIGURE 26 LEVEL MATCH DESIGN FOR RS 232 49 FIGURE 27 REFERENCE DES...

Page 7: ...E DESIGN FOR STATUS 70 FIGURE 49 REFERENCE DESIGN FOR RF 71 FIGURE 50 RF SOLDERING SAMPLE 73 FIGURE 51 M50 TOP AND SIDE DIMENSIONS 79 FIGURE 52 M50 BOTTOM DIMENSIONS 80 FIGURE 53 RECOMMENDED FOOTPRINT WITHOUT BOTTOM CENTRE PADS 81 FIGURE 55 TOP VIEW OF THE MODULE 82 FIGURE 56 BOTTOM VIEW OF THE MODULE 83 FIGURE 57 PASTE APPLICATION 85 FIGURE 58 RAMP SOAK SPIKE REFLOW PROFILE 86 FIGURE 59 MODULE TR...

Page 8: ...12 07 20 Baly BAO 1 Deleted the USB interface 2 Deleted the camera interface 1 3 2012 10 22 Mountain ZHOU 1 Updated functional diagram 2 Updated reference design circuit 3 Updated audio characteristics 4 Updated VRTC DC characteristics 5 Updated SLEEP current consumption 6 Updated internet service protocols 7 Updated SIM pins name 8 Modified PCM function 9 Deleted FAX function 2 0 2012 06 16 Ray X...

Page 9: ...10 Support GSM 07 10 multiplexing 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...

Page 10: ...mmunications 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 Division Multiple Access FR Full Rate ...

Page 11: ...a 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 Input Voltage Value VImin Absolute Minimum Input Voltage Value VOHmax Maximum O...

Page 12: ... 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 or fume Switch off the cellular terminal when you are near petrol sta...

Page 13: ...t 1 4 2 FCC Radiation exposure statement This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment This equipment should be installed and operated with minimum distance 20cm between the radiator and your body as well as kept minimum 20cm from radio antenna depending on the Mobile status of this module usage GSM cellular terminals or mobiles operate over r...

Page 14: ...tenna gain Type Maximum Gain 850Hz 900Hz Maximum Gain 1800Hz 1900Hz Impedance External Antenna Monopole 0 5dBi 2dBi 50Ω Vehicular antenna 0 5dBi 2dBi 50Ω Internal Antenna Monopole 0 5dBi 2dBi 50Ω PIFA 0 5dBi 2dBi 50Ω FPC 0 5dBi 2dBi 50Ω PCB 0 5dBi 2dBi 50Ω This radio module must not be installed to co locate and operate simu ltaneously with other radios in host system additional testing and equipm...

Page 15: ...ed with power saving technique the current consumption of M50 is as low as 1 3 mA in SLEEP mode when DRX is 5 M50 is integrated with Internet service protocols such as TCP UDP FTP and PPP Extended AT commands have been developed for customer to use these Internet service protocols easily The module fully complies with the RoHS directive of the European Union 2 1 Key features Table 3 Module key fea...

Page 16: ...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 Echo Cancellation Noise Reduction Embedded one amplifier of class AB with maximum driving power up to 800mW UART interfaces UART Port Seven lines on UART port interface Used for AT command GPRS data and CSD data Multiplexing function Support au...

Page 17: ...me 1 Timeslot 2 Timeslot 4 Timeslot CS 1 9 05kbps 18 1kbps 36 2kbps CS 2 13 4kbps 26 8kbps 53 6kbps CS 3 15 6kbps 31 2kbps 62 4kbps CS 4 21 4kbps 42 8kbps 85 6kbps 2 2 Functional diagram The following figure shows a block diagram of the M50 module and illustrates the major functional parts Power management Baseband Serial Flash The radio frequency part The peripheral interface Charge interface PCM...

Page 18: ...C STATUS NETLIGHT UART SIM Interface Audio SD Interface PCM Inteface Reset ESD PMU Charge Interface Charge Figure 1 Module functional diagram 2 3 Evaluation board In order to help customer to develop applications with M50 Quectel supplies an evaluation board EVB RS 232 to USB cable power adapter earphone antenna and other peripherals to control or test the module For details please refer to the do...

Page 19: ...3 pin SMT pads and it adopts LCC package Detailed descriptions on Sub interfaces included in these pads are given in the following chapters Power supply Power on down Charge interface RTC Serial interfaces Audio interfaces SIM interface SD interface PCM interface ADC Quecctel Confidential ...

Page 20: ...ESERVED RESERVED RESERVED RESERVED ADC1 ADC0 RESERVED NETLIGHT SPK2P AGND MIC2P MIC2N MIC1P MIC1N SPK1N SPK1P LOUDSPKN LOUDSPKP STATUS PWRKEY EMERG_OFF PCM_IN PCM_CLK RESERVED RESERVED TXD_AUX RXD_AUX DBG_TXD DBG_RXD RESERVED DCD RI DTR CTS RTS RXD TXD SIM1_GND SIM1_RST SIM1_CLK SIM1_DATA SIM1_VDD VBAT GND PCM RF UART Power SIM Reserved Audio ADC Other SD PCM_OUT PCM_SYNC RESERVED RESERVED RESERVE...

Page 21: ...VED 25 RESERVED 26 RESERVED 27 RESERVED 28 RESERVED 29 RESERVED 30 RESERVED 31 RESERVED 32 RESERVED 33 RESERVED 34 SD_CMD O 35 SD_CLK O 36 SD_DATA0 I O 37 GND 38 RESERVED 39 RESERVED 40 TXD_AUX O 41 RXD_AUX I 42 DBG_TXD O 43 DBG_RXD I 44 RESERVED 45 DCD O 46 RI O 47 DTR I 48 CTS O 49 RTS I 50 RXD I 51 TXD O 52 SIM_GND 53 SIM_RST O 54 SIM_CLK O 55 SIM_DATA I O 56 SIM_VDD O 57 SIM_PRESENCE I 58 RESE...

Page 22: ...ply sufficient current in a transmitting burst which typically rises to 1 6A VRTC 59 I O Power supply for RTC when VBAT is not supplied for the system Charging for backup battery or golden capacitor when the VBAT is supplied VImax 3 3V VImin 1 5V VInorm 2 8V VOmax 2 85V VOmin 2 6V VOnorm 2 8V Iout max 1mA Iin 2 6 5 uA If unused keep this pin open VDD_EXT 60 O Supply 2 8V voltage for external circu...

Page 23: ...Use it only when normal shutdown through PWRKEY or AT command cannot perform well VILmax 0 4V VIHmin 2 2V Vopenmax 2 8V Open drain collector driver required in cellular device application If unused keep this pin open Module indicator PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT STATUS 16 O Indicate module operating status High level indicates module is power on and low level indicate...

Page 24: ...of class AB internally 3 Support both voice and ringtone output Net status indicator PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT NETLIGHT 4 O Network status indication VOHmin 0 85 VDD_EXT VOLmax 0 15 VDD_EXT If unused keep this pin open UART Port PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT DTR 47 I Data terminal ready VILmin 0V VILmax 0 25 VDD_EXT VIHmin 0 75 VDD_EXT ...

Page 25: ...40 O Transmit data VILmin 0V VILmax 0 25 VDD_EXT VIHmin 0 75 VDD_EXT VIHmax VDD_EXT 0 3 VOHmin 0 85 VDD_EXT VOLmax 0 15 VDD_EXT If unused keep these pins open RXD_AUX 41 I Receive data SIM interface PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT SIM_VDD 56 O Power supply for SIM card The voltage can be selected by firmware automatically Either 1 8V or 3V All signals of SIM interface sh...

Page 26: ...Lmin 0V VILmax 0 25 VDD_EXT VIHmin 0 75 VDD_EXT VIHmax VDD_EXT 0 3 If unused keep this pin open ADC PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT ADC0 2 I General purpose analog to digital converter Voltage range 0V to 2 8V Please give priority to the use of ADC0 If unused keep these pins open ADC1 1 I General purpose analog to digital converter Voltage range 0V to 2 8V PCM PIN NAME P...

Page 27: ...x 0 25 VDD_EXT VIHmin 0 75 VDD_EXT VIHmax VDD_EXT 0 3 VOHmin 0 85 VDD_EXT VOLmax 0 15 VDD_EXT SD_CLK 35 O SD clock SD_DATA0 36 I O SD data RF interface PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT RF_ANT 63 I O RF antenna pad Impedance of 50Ω Other interface PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT DOWNLOAD 3 I VILmin 0V VILmax 0 25 VDD_EXT VIHmin 0 75 VDD_EXT VIHma...

Page 28: ...M50 Hardware Design M50_HD_V2 0 28 71 75 Quecctel Confidential ...

Page 29: ... to GPRS network but no GPRS PDP context is active The SGSN knows the Routing Area where the module is located at GPRS READY 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...

Page 30: ...he module it is recommended that the max voltage drop during the transmit burst does not exceed 400mV Vdrop 4 615ms 577us IVBAT 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 3...

Page 31: ...pply If there is a big voltage difference between the input source and the desired output VBAT a switcher power converter is prefer to use as a power supply Figure 5 shows a reference design for 5V input power source The designed output for the power supply is 4 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 the pins of V...

Page 32: ... is power on or not An open collector driver circuit is suggested to control the PWRKEY A simple reference circuit is illustrated as below Turn on pulse PWRKEY 4 7K 47K Figure 6 Turn on the module using driving circuit Note The module is set to autobauding mode AT IPR 0 in default configuration In the autobauding mode the URC RDY after powering on is not sent to host controller When the module rec...

Page 33: ...ing figure S1 PWRKEY TVS1 Close to S1 Figure 7 Turn on the module using keystroke The power on scenarios is illustrated as the following figure EMERG_OFF INPUT VDD_EXT OUTPUT VIL 0 1 VBAT VIH 0 6 VBAT VBAT PWRKEY INPUT 54ms STATUS OUTPUT 800ms 1s OFF BOOTING MODULE STATUS RUNNING 2 1 Figure 8 Timing of turning on system Make sure that VBAT is stable before pulling down PWRKEY pin The time between ...

Page 34: ...re 9 VBAT PWRKEY INPUT STATUS OUTPUT EMERG_OFF INPUT Logout net about 2s to 12s 0 6s Pulldown 1s 160us Figure 9 Timing of turning off the module 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 thus it is a safe way Before the completion of the power down procedure the module sends...

Page 35: ...mode can also be indicated by STATUS pin which is a low level voltage in this mode Please refer to the document 1 for details about the AT command AT QPOWD 3 4 2 3 Over voltage or 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 If the voltage is 4 5V the following UR...

Page 36: ... down by driving the pin EMERG_OFF to a low level voltage over 20ms and then releasing it The EMERG_OFF line can be driven by an open drain collector driver or a button The circuit is illustrated as the following figures Emergency shutdown pulse EMERG_OFF 4 7K 47K Figure 10 Reference circuit for EMERG_OFF by using driving circuit S2 EMERG_OFF TVS2 Close to S2 Figure 11 Reference circuit for EMERG_...

Page 37: ... PWRKEY INPUT STATUS OUTPUT Delay 0 5s Turn off Restart Pull down the PWRKEY to turn on the module Figure 12 Timing of restarting system The module can also be restarted by the PWRKEY after emergency shutdown EMERG_OFF INPUT STATUS OUTPUT Delay 2s 6us Pulldown 20ms PWRKEY INPUT Figure 13 Timing of restarting system after emergency shutdown Quecctel Confidential ...

Page 38: ...1 Minimum functionality mode Minimum functionality mode reduces the functionality of the module to a minimum level thus minimize the current consumption when the slow clocking mode is activated at the same time This mode is set with the AT CFUN command which provides the choice of the functionality levels fun 0 1 4 0 minimum functionality 1 full functionality default 4 disable both transmitting an...

Page 39: ...ive voice SMS or GPRS paging from network but the UART port is not accessible 3 6 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 mod...

Page 40: ...n cell battery or a super cap can be used to backup power supply for RTC The following figures show various sample circuits for RTC backup Module RTC Core 1 5K VRTC Non chargeable Backup Battery Figure 14 RTC supply from non chargeable battery VRTC Rechargeable Backup Battery Module RTC Core 1 5K Figure 15 RTC supply from rechargeable battery VRTC Large Capacitance Capacitor Module RTC Core 1 5K F...

Page 41: ...to RXD of DTE RXD Receive data from TXD of DTE RTS Request 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 cont...

Page 42: ...ion of the UART interfaces Interface Name Pin Description Debug Port DBG_RXD 43 Receive data of the debug port DBG_TXD 42 Transmit data of the debug port UART Port RI 46 Ring indicator RTS 51 Request to send CTS 48 Clear to send RXD 50 Receive data of the UART port TXD 49 Transmit data of the UART port DTR 47 Data terminal ready DCD 45 Data carrier detection Auxiliary UART Port RXD_AUX 41 Receive ...

Page 43: ...ommended to wait 2 to 3 seconds before sending the first AT character 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 factory setting The ...

Page 44: ...unction UART connection is shown as below when it is applied in modulation demodulation TXD RXD RTS CTS DTR DCD RI TXD RXD RTS CTS DTR DCD RING Module DCE Serial port UART port GND GND PC DTE Figure 18 Reference design for Full Function UART Three line connection is shown as below TXD RXD GND UART port RTS 0R TXD RXD GND Module DCE Host DTE Controller Figure 19 Reference design for UART Port Quecc...

Page 45: ... upgrade The TXD RXD can be used to upgrade firmware 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 Reference design for Firmware upgrade Note The firmware of module might need to be upgraded due to certain reasons it is recommended to reserve ...

Page 46: ...r Debug Port 3 9 3 Auxiliary UART Port 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 CSD FAX Multiplexing function etc Auxiliary UART port supports the communication baud rates as the following 4800 9600 14400 19200 28800 38400 57600 115200 The default baud rate setting is 115200bps and does not support autobau...

Page 47: ...3 9 4 UART application The reference design of 3 3V level match is shown as below If the host is a 3V system please change the 5 6K resistor to 15K MCU ARM TXD RXD 1K TXD RXD RTS CTS 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 Level match design for 3 3V system Quecctel Confidential ...

Page 48: ...ed to input solid line of the module Output dotted line of module should be referred to output solid line of the module As to the circuit below VDD_EXT supplies power for the I O of module while VCC_MCU supplies power for the I O of the MCU ARM MCU ARM TXD RXD VDD_EXT 4 7K VCC_MCU 4 7K 5 6K 4 7K VDD_EXT TXD RXD RTS CTS DTR RI RTS CTS GND GPIO DCD Module GPIO EINT VCC_MCU Voltage level 5V 4 7K GND ...

Page 49: ...fter must be used 9 8 7 6 5 4 3 2 1 15 14 8 9 11 12 5 7 6 10 4 26 2 27 13 18 20 21 16 17 19 22 23 24 3 1 25 28 GND SP3238 3V GND GND T5OUT SHUTDOWN V GND V VCC T4OUT T2OUT T3OUT T1OUT R3IN R2IN R1IN STATUS 3V ONLINE R1OUT R2OUT R3OUT R1OUT GND T5IN T4IN T3IN T2IN T1IN C2 C2 C1 C1 MODULE RXD DTR RTS RI CTS TXD DCD To PC serial port Figure 26 Level match design for RS 232 Quecctel Confidential ...

Page 50: ...n be swapped by AT QAUDCH command For more details please refer to the document 1 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 customer 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 AT QSIDET is used to set the side ...

Page 51: ...gree of the RF interference in the voice channel during GSM transmitting period largely depends on the application design In some cases GSM900 TDD noise is more severe while in other cases DCS1800 TDD noise is more obvious Therefore customer can have a choice based on test results Sometimes even no RF filtering capacitor is required The capacitor which is used for filtering out RF noise should be ...

Page 52: ...D ESD 10pF 0603 10pF 0603 10pF 0603 33pF 0603 33pF 0603 33pF 0603 Figure 27 Reference design for AIN1 AIN2 3 10 3 Receiver and speaker interface design SPK1P SPK1N Differential layout 10pF 0603 10pF 0603 33pF 0603 33pF 0603 33pF 0603 Close to Speaker GND GND 10pF 0603 ESD ESD Module Figure 28 Reference design for AOUT1 Quecctel Confidential ...

Page 53: ...plifier circuit 10pF 0603 10pF 0603 33pF 0603 33pF 0603 Close to Speaker GND GND ESD ESD C2 C1 Figure 30 Speaker interface design with an amplifier for AOUT2 Texas Instrument s TPA6205A1is recommended for a suitable differential audio amplifier There are plenty of excellent audio amplifiers in the market Note The value of C1 and C2 here depends on the input impedance of audio amplifier Quecctel Co...

Page 54: ...ntial layout AGND GND GND GND GND AGND Module 4 7uF 33pF 0603 10pF 0603 33pF 0603 10pF 0603 ESD ESD Figure 31 Earphone interface design 3 10 5 Loud speaker interface design LOUDSPKP LOUDSPKN Differential layout 10pF 10pF 33pF 33pF Close to Speaker GND GND 100pF ESD ESD Module 0R 0R 0603 0603 0603 0603 Figure 32 Loud speaker interface design Quecctel Confidential ...

Page 55: ... 32 Ohm Ref level 0 4 8 Vpp Auxiliary Output AOUT2 Single Ended Load Resistance 16 32 Load Resistance Ref level 0 2 4 Vpp Output AOUT3 Differential Load Resistance 8 Load Resistance Ref level 0 2 VBAT Vpp 3 11 SIM card interface 3 11 1 SIM card application The SIM interface supports the functionality of the GSM Phase 1 specification and also supports the functionality of the new GSM Phase 2 specif...

Page 56: ...tail of this AT command please refer to the document 1 When AT QSIMDET 1 0 is set and the tray with SIM card is removed from SIM socket the following URC will be presented CPIN NOT READY When the tray with SIM card 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_GND SIM_RST SIM_CLK SIM_DATA SIM_P...

Page 57: ...the trace is less than 20cm Keep SIM card signal away from RF and VBAT alignment Assure the ground between module and SIM cassette short and wide Keep the width of ground no less than 0 5mm to maintain the same electric potential The decouple capacitor of SIM_VDD is less than 1uF and must be near to SIM cassette To avoid cross talk between SIM_DATA and SIM_CLK Keep them away with each other and sh...

Page 58: ...lder Name Pin Description 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 3 11 3 8 Pin SIM cassette For 8 pin SIM card holder it is recommended to use Molex 91228 Please visit http www molex com for more information Quecctel Confidential ...

Page 59: ... Pin Description SIM_VDD C1 SIM Card Power supply SIM_RST C2 SIM Card Reset SIM_CLK C3 SIM Card Clock SIM_PRESENCE C4 SIM Card Presence Detection GND C5 Ground VPP C6 Not Connect 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 Quecctel Confidential ...

Page 60: ...y With interface features and reference circuit of SD card shown in Figure 37 the users can easily design the SD card application circuit to enhance the memory capacity of the module The module can record and store the audio files to the SD card and play the audio files from SD card as well Table 19 Pin definition of the SD card interface Module SD_DATA0 SD_CLK SD_CMD DATA2 DATA1 DATA0 CD DATA3 CM...

Page 61: ...race difference of DATA0 CMD and CLK to be 10mm The SD_CLK and SD_DATA0 line must be shielded by GND in order to avoid interference In order to offer good ESD protection it is recommended to add TVS on signals with the capacitance is less than 15pF Reserve external pull up resistor for other data lines except the DATA0 Pin NO Pin name of SD card Pin name of T Flash Micro SD card 1 CD DATA3 DATA2 2...

Page 62: ... PCM data output PCM_SYNC 21 O PCM frame synchronization 3 13 1 Configuration M50 supports 16 bits line code PCM format The sample rate is 8 KHz the clock source is 256 KHz and the module can only act as master mode The PCM interfaces support long and short synchronization simultaneously It only supports MSB first For more detailed information please see the table below Table 22 Configuration PCM ...

Page 63: ... of 16 bits are sign extension and in the Zero padding mode the low three bits of 16 bits are zero padding 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 PCM_CLK PCM_SYNC PCM_OUT PCM_IN MSB MSB Sign extension Sign extension Figure 38 Long synchronization Sign extension diagram 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 PCM_CLK PCM_SYNC PCM_OUT PCM_IN MSB MSB Zero padding ...

Page 64: ... a master the module provides synchronization and clock source The reference design is shown as below PCM_SYNC PCM_CLK PCM_OUT PCM_IN PCM_SYNC PCM_CLK PCM_IN PCM_OUT Module master Codec slave GND GND Figure 42 Reference design for PCM 3 13 4 AT command There are two AT commands about the configuration of PCM are listed as below AT QPCMON can configure operating mode of PCM AT QPCMON mode Sync_Type...

Page 65: ...1 8 Programmed from one bit to eight bit SignExtension 0 1 0 Zero padding 1 Sign extension MSBFirst 0 1 0 MSB first 1 Not supported AT QPCMVOL can configure volume of input and output AT QPCMVOL vol_pcm_in vol_pcm_out Table 24 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 thi...

Page 66: ...Table 26 Characteristics of the ADC Parameter Min Typ Max Unit Voltage Range 0 2 8 V ADC Resolution 10 bit ADC Accuracy 2 7 mV 3 15 Behaviors of the RI Table 27 Behaviors of the RI State RI response Standby HIGH Voice calling Change to LOW then 1 Change to HIGH when call is established 2 Use ATH to hang up the call RI changes to HIGH 3 Calling part hangs up RI changes to HIGH first and changes to ...

Page 67: ...s 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 RI Idle Ring Off hook by ATA On hook by ATH SMS received HIGH LOW Figure 43 RI behavior of voice calling as a receiver RI Idle Ring Data calling establish SMS received HIGH LOW On hook by ATH Figure 44 RI behavior of data calling as a receiver ...

Page 68: ...M50 Hardware Design M50_HD_V2 0 68 RI Idle or Talking URC or SMS received HIGH LOW 120ms Figure 46 RI behavior of URC or SMS received Quecctel Confidential ...

Page 69: ...with network 64ms On 600ms Off GPRS data transfer is ongoing A reference circuit is shown as below Module 300R 4 7K 47K VBAT NETLIGHT Figure 47 Reference design for NETLIGHT 3 17 Operating status indication The STATUS pin is set as an output pin and can be used to judge whether module is power on In customer s design this pin can be connected to a GPIO of DTE or be used to drive an LED in order to...

Page 70: ...M50 Hardware Design M50_HD_V2 0 70 Module 300R 4 7K 47K VBAT STATUS Figure 48 Reference design for STATUS Quecctel Confidential ...

Page 71: ... RF antenna pad should be micro strip line or other types of RF trace whose characteristic impedance should be close to 50Ω M50 comes with grounding pads which are next to the antenna pad in order to give a better grounding Besides a type match circuit is suggested to be used to adjust the RF performance To minimize the loss on the RF trace and RF cable take design into account carefully It is rec...

Page 72: ... This design conforms to the GSM specification as described in section 13 16 of 3GPP TS 51 010 1 4 3 RF receiving sensitivity Table 32 The module conducted RF receiving sensitivity Frequency Receive sensitivity GSM850 108 5dBm EGSM900 108 5dBm DCS1800 108 5dBm PCS1900 108 5dBm 4 4 Operating frequencies Table 33 The module operating frequencies Frequency Receive Transmit ARFCH GSM850 869 894MHz 824...

Page 73: ...V2 0 73 4 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 50 RF soldering sample Quecctel Confidential ...

Page 74: ...ring 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 35 Operating temperature Parameter Min Typ Max Unit Normal Temperature 35 25 80 Restricted Operation1 40 35 80 85 Storage Temperature 45 90 1 When the m...

Page 75: ...kHz 50 2 mV mV IVBAT Average supply current Power down mode SLEEP mode DRX 5 30 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 GSM850 EGSM 900 DCS1800 PCS1900 13 13 mA mA TALK mode GSM850 EGSM 9001 DCS1800 PCS19002 209 208 191 202 mA mA DATA mode GPRS 3 Rx 2Tx GSM850 EGSM 9001 DCS1800 PCS19002 435 400 313 337 ...

Page 76: ... 208mA power level 12 Typical 96mA power level 19 Typical 73mA DCS1800 power level 0 250mA Typical 191mA power level 7 Typical 93mA power level 15 Typical 70mA PCS1900 power level 0 250mA Typical 202mA power level 7 Typical 95mA power level 15 Typical 71mA GPRS Data DATA mode GPRS 1 Rx 1 Tx CLASS 12 GSM850 power level 5 350mA Typical 199mA power level 12 Typical 87mA power level 19 Typical 63mA EG...

Page 77: ... power level 12 Typical 185mA power level 19 Typical 106mA DCS 1800 power level 0 490mA Typical 399mA power level 7 Typical 150mA power level 15 Typical 94mA PCS 1900 power level 0 480mA Typical 460mA power level 7 Typical 166mA power level 15 Typical 98mA DATA mode GPRS 4 Rx 1 Tx CLASS 12 GSM850 power level 5 350mA Typical 265mA power level 12 Typical 122mA power level 19 Typical 93mA EGSM 900 po...

Page 78: ...t 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 ESD protection precautions should still be emphasized Proper ESD handling and packaging procedures must be applied throughout the processing handling and operation of any applications using the module The measured ESD values of module ar...

Page 79: ...ware Design M50_HD_V2 0 79 6 Mechanical dimensions This chapter describes the mechanical dimensions of the module 6 1 Mechanical dimensions of module Figure 51 M50 top and side dimensions Quecctel Confidential ...

Page 80: ...M50 Hardware Design M50_HD_V2 0 80 Figure 52 M50 bottom dimensions Quecctel Confidential ...

Page 81: ...M50 Hardware Design M50_HD_V2 0 81 6 2 Recommended footprint without bottom centre pads silkscreen frame line Figure 53 Recommended footprint without bottom centre pads Quecctel Confidential ...

Page 82: ...M50 Hardware Design M50_HD_V2 0 82 6 4 Top view of the module Figure 54 Top view of the module Quecctel Confidential ...

Page 83: ...M50 Hardware Design M50_HD_V2 0 83 6 5 Bottom view of the module Figure 55 Bottom view of the module Quecctel Confidential ...

Page 84: ... must be Mounted within 72 hours at factory conditions of 30 60 RH Stored at 10 RH Devices require bake before mounting if Humidity indicator card is 10 when read at 23 5 Mounted exceed 72 hours at factory conditions of 30 60 RH If baking is required devices may be baked for 48 hours at 125 5 Note As plastic container cannot be subjected to high temperature devices must be removed prior to high te...

Page 85: ...nsure the module soldering quality the thickness of stencil at the hole of the module pads should be 0 2mm for M50 Figure 56 Paste application Suggest peak reflow temperature is from 235 to 245 for SnAg3 0Cu0 5 alloy Absolute max reflow temperature is 260 To avoid damage to the module when it was repeatedly heated it is suggested that the module should be mounted after the first panel has been ref...

Page 86: ...7 Ramp Soak Spike reflow profile 7 3 Packaging M50 modules are distributed in trays of 20 pieces each This is especially suitable for the M50 according to SMT processes requirements The trays are stored inside a vacuum sealed bag which is ESD protected It should not be opened until the devices are ready to be soldered onto the application Figure 58 Module tray Quecctel Confidential ...

Page 87: ...d 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 60 Figure 59 Radio block structure of CS 1 CS 2 and CS 3 Radio block structure of CS 4 is shown as Figure 61 Figure 60 Radio block structure of CS 4 Block code No coding 456 bits USF B...

Page 88: ...er indicates 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 is shown in Table 40 Table 40 GPRS multi slot classes Multislot class Downlink slots Uplink slots Active ...

Page 89: ...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 Quecctel Confidential ...

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