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Neo_M680 GPRS Module

Hardware User Guide

Version 1.4

Summary of Contents for Neo_M680

Page 1: ...Neo_M680 GPRS Module Hardware User Guide Version 1 4...

Page 2: ...s document is intended for system engineers SEs development engineers and test engineers The information in this document is subject to change without notice due to product version update or other rea...

Page 3: ...dified the description of some pins Qiao Naiwei 2014 02 V1 2 Modified the PCB encapsulation and definition of several pins Qiao Naiwei 2014 04 V1 3 Optimized the table structure of pin definition and...

Page 4: ...Power On Off Control and Procedure 13 3 1 5 RESET 16 3 2 UART 16 3 3 USB Interfaces 18 3 4 DTR and RING 19 3 4 1 DTR Pin 19 3 4 2 RING Signal Indicator 20 3 5 SIM Card Interface 20 3 6 Running LED In...

Page 5: ...Neo_M680 GPRS Module Hardware User Guide Copyright Neoway Technology Co Ltd iv 7 Package 34 8 Abbreviations 35...

Page 6: ...en DCE and DTE 16 Figure 3 13 Recommended circuit for the communication between 3 3V MCU and UART 17 Figure 3 14 Recommended circuit for the communication between 5V MCU and UART 18 Figure 3 15 USB ci...

Page 7: ...ART 16 Table 3 3 USB interface 18 Table 3 4 DTR and RING pins 19 Table 3 5 SIM Card Interface 20 Table 3 6 LED indicator 22 Table 3 7 Audio interface 23 Table 4 1 Electric feature of the module 29 Tab...

Page 8: ...x 15 mm x 2 1 mm which can meet most customers requirements It provides customers the following hardware resources UART interfaces used for data communication firmware updating and commissioning and...

Page 9: ...al band quad band Supporting band locking Sensitivity 107 dBm Max transmit power GSM850 EGSM900 Class4 2W DCS1800 PCS1900 Class1 1W Protocol Supporting GSM GPRS Phase 2 2 AT GSM07 07 Extended AT comma...

Page 10: ...Supporting server and client modes Circuit Switch Data CSD data service USSD Supplementary service Call forwarding CFB CFNA CFU Call waiting Call holding and multi way calling UART Supporting hardware...

Page 11: ...C0P MIC0N EAR_L EAR_R MIC1 RECN RECP NC NC NC NC NC NC GND NC SIM_CLK SIM_DATA NC NC NC NC NC NC GND NC GND NC NC RTS CTS VDD_EXT URXD UTXD NC NC DTR RING LIGHT RESET GND VRTC VBAT VBAT VBAT ADC_IN NC...

Page 12: ...ximum charging output current 2 mA 18 29 31 46 48 60 63 67 69 71 GND P Ground 1 ON OFF DI On Off input 0 VIL 0 6 2 1 VIH VBAT Low level pulse can change the On Off state 45 RESET DI Reset input 0 VIL...

Page 13: ...VSIM 0 75 VSIM VIH VSIM 0 VOL 0 15 VSIM 0 85 VSIM VOH VSIM Compatible with 1 8 3 0 V SIM card 20 SIM_DATA DI O SIM card data IO 21 SIM_RST DO SIM card reset output 22 VSIM P SIM card power supply outp...

Page 14: ...s DO indicates digital signal output pins I PD indicates digital signal input pins with pull down I PU indicates digital signal input pins with pull up AI indicates analogy signal input pins AO indica...

Page 15: ...CB Foot Print LGA packaging is adopted to package the pins of the M680 module Figure 2 2 shows the recommended PCB foot print Figure 2 2 PCB foot print recommended for M680 unit mm 0 5 1 0 0 5 1 0 18...

Page 16: ...power supply of the module Its input voltage ranges from 3 5 V to 4 3 V and the preferable value is 3 9V In addition to digital signals and analog signals it supplies power for RF power amplifier The...

Page 17: ...A controllable power supply is preferable if used in harsh conditions The module might fail to reset in remote or unattended applications or in an environment with great electromagnetic interference...

Page 18: ...pacitor Protection Place a TVS diode VRWM 5 V on the VBAT power supply to ground especially in automobile applications For some stable power supplies zener diodes can decrease the power supply oversho...

Page 19: ...s In this situation the diode will obviously decrease the module performances or result in unexpected restarts due to the forward voltage of diode will vary greatly in different temperature and curren...

Page 20: ...o turn on or off the module Power On Procedure While the module is off drive the ON OFF pin to ground for at least 1 2 second and then release the module will start An unsolicited message EIND 128 wil...

Page 21: ...conds later it will shut down Another approach to turn off the module is using AT commands For details see Neo_M680 GPRS Module AT Commands Figure 3 8 shows the power off procedure of the module Figur...

Page 22: ...tor is used delete R1 and R2 Level abnormalities at interfaces connected to the external MCU especially the UART port might affect the power on procedure of the module For example when a module is tur...

Page 23: ...eparate it by using triode Please refer to Figure 3 11 Figure 3 11 Reset circuit with triode separating 3 2 UART Table 3 2 UART Signal I O Function Description Remarks RTS DI Request to send CTS DO Cl...

Page 24: ...on between 3 3V MCU and UART In Figure 3 13 100 pF filter capacitor should be placed near the receive pin of the module Resistance 200 to 470 and capacity 100 pF to 470 pF can be selected based on the...

Page 25: ...te You can select resistors with great resistance to reduce the power consumption when the power supply has great voltage or the baudrate is low But the resistance will affect the quality of the squar...

Page 26: ...not used RING DO Ring output Left disconnected if not used 3 4 1 DTR Pin Generally DTR is used for sleep mode control It works with AT commands For details see M680 GPRS Module AT Command Set Based on...

Page 27: ...de 3 4 2 RING Signal Indicator Calling Once a voice call is coming UART output RING character strings and meanwhile the RING pin outputs 250 ms low pulses at 4s period After the call is answered the h...

Page 28: ...mended on the SIM signals especially in automotive electronics or other applications with badly ESD In other applications replace ESD diodes with 27 pF to 33 pF grounding capacitors The ESD diodes or...

Page 29: ...ng LED Indicator Table 3 6 LED indicator Signal I O Function Remarks LIGHT DO Indicates running status 2 8 V output max 4 mA High level drives the LED indicator The LIGHT pin can output a 4 mA current...

Page 30: ...Single end MIC1 input RECN AO Negative electrode of receiver output 32 receiver driving output RECP AO Negative electrode of receiver output M680 supports multiple lines of audio interfaces to meet c...

Page 31: ...r a peak voltage greater than 200 mV AC an attenuation circuit comprised of R1 R4 should be used Figure 3 23 Reference design for common audio input In above figures the audio input circuits are desig...

Page 32: ...gure 3 25 Reference design for speaker output Figure 3 26 shows a reference design for the earphone interface through which a 16 32 receiver can be driven directly You are advised to use large capacit...

Page 33: ...etween the antenna pad of module and the antenna connector should have a 50 characteristic impedance and be as short as possible The trace should be surrounded by ground copper Place plenty of via hol...

Page 34: ...r special ESD protection an ESD diode can be placed close to the antenna But ensure using a low junction capacitance ESD diode The junction capacitance should be less than 0 5 pF otherwise the RF sign...

Page 35: ...00RA1 from Murata is recommended Figure 3 30 shows the encapsulation specifications Figure 3 30 Encapsulation specifications of Murata RF connector RF cable can also be connected to the module by sold...

Page 36: ...5 uA If the voltage is too low the module might fail to start If the voltage is too high or there is a voltage burst during the startup the module might be damaged permanently If you use LDO or DC DC...

Page 37: ...RX 9 987 uA Voice service Maximum power level in full rate mode GSM850 208 55 mA EGSM900 198 43 mA DCS1800 136 71 mA PCS1900 132 29 mA GPRS class 12 4TX 1RX 4Up 1Down GSM850 426 58 mA EGSM900 422 15 m...

Page 38: ...ology Co Ltd 31 Humility 45 Temperature 25 Table 4 4 ESD feature of the module Testing Point Contact Discharge Air Discharge VBAT 8 KV 15 KV GND 8 KV 15 KV ANT 8 KV 15 KV Cover 8 KV 15 KV RXD TXD 4 KV...

Page 39: ...1805 1880 MHz PCS1900 1850 1910 MHz 1930 1990 MHz 5 2 Transmitting Power and Receiving Sensitivity 5 2 1 Transmitting Power Table 5 2 Transmitting power GSM800 EGSM900 PCL Transmitting Power Threshold...

Page 40: ...22 dBm 3 dBm 5 20 dBm 3 dBm 6 18 dBm 3 dBm 7 16 dBm 3 dBm 8 14 dBm 3 dBm 9 12 dBm 3 dBm 10 10 dBm 4 Bm 11 8 dBm 4 Bm 12 6 dBm 4 Bm 13 4 dBm 4 dBm 14 2 dBm 5 dBm 15 0 dBm 5 dBm 5 2 2 Receiving Sensiti...

Page 41: ...r volume Minimum of 0 15mm stencil thickness is recommended Use bigger aperture size of the stencil than actual pad size Use a low residue no clean type solder paste 7 Package M680 modules are package...

Page 42: ...Data Terminal Equipment DTMF Dual Tone Multi Frequency DTR Data Terminal Ready EFR Enhanced Full Rate EGSM Enhanced GSM EMC Electromagnetic Compatibility EMI Electro Magnetic Interference ESD Electron...

Page 43: ...dio Frequency ROM Read only Memory RMS Root Mean Square RTC Real Time Clock SIM Subscriber Identification Module SMS Short Message Service SRAM Static Random Access Memory TA Terminal adapter TDMA Tim...

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