Quectel M85, Hardware Design

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GSM/GPRS Module
M85 Hardware Design
M85_Hardware_Design Confidential / Released 7 / 92
Figure Index
FIGURE 1: MODULE FUNCTIONAL DIAGRAM ............................................................................................... 14
FIGURE 2: PIN ASSIGNMENT ......................................................................................................................... 16
FIGURE 3: VOLTAGE RIPPLE DURING TRANSMITTING .............................................................................. 25
FIGURE 4: REFERENCE CIRCUIT FOR THE VBAT INPUT ........................................................................... 26
FIGURE 5: REFERENCE CIRCUIT FOR POWER SUPPLY ............................................................................ 26
FIGURE 6: TURN ON THE MODULE WITH AN OPEN-COLLECTOR DRIVER .............................................. 27
FIGURE 7: TURN ON THE MODULE WITH A BUTTON .................................................................................. 28
FIGURE 8: TURN-ON TIMING .......................................................................................................................... 28
FIGURE 9: TURN-OFF TIMING ........................................................................................................................ 29
FIGURE 10: AN OPEN-COLLECTOR DRIVER FOR EMERG_OFF ................................................................ 31
FIGURE 11: REFERENCE CIRCUIT FOR EMERG_OFF BY USING BUTTON .............................................. 32
FIGURE 12: TIMING OF RESTARTING SYSTEM ............................................................................................ 32
FIGURE 13: TIMING OF RESTARTING SYSTEM AFTER EMERGENCY SHUTDOWN ................................ 33
FIGURE 14: RTC SUPPLY FROM A NON-CHARGEABLE BATTERY ............................................................. 35
FIGURE 15: RTC SUPPLY FROM A RECHARGEABLE BATTERY ................................................................. 35
FIGURE 16: RTC SUPPLY FROM A CAPACITOR ........................................................................................... 36
FIGURE 17: CHARGING CHARACTERISTICS OF SEIKO’S XH414H-IV01E ................................................ 36
FIGURE 18: REFERENCE DESIGN FOR FULL-FUNCTION UART ................................................................ 40
FIGURE 19: REFERENCE DESIGN FOR UART PORT ................................................................................... 40
FIGURE 20: REFERENCE DESIGN FOR UART PORT WITH HARDWARE FLOW CONTROL .................... 41
FIGURE 21: REFERENCE DESIGN FOR FIRMWARE UPGRADE ................................................................. 41
FIGURE 22: REFERENCE DESIGN FOR DEBUG PORT ............................................................................... 42
FIGURE 23: REFERENCE DESIGN FOR AUXILIARY UART PORT ............................................................... 43
FIGURE 24: LEVEL MATCH DESIGN FOR 3.3V SYSTEM .............................................................................. 43
FIGURE 25: LEVEL MATCH DESIGN FOR 5V SYSTEM ................................................................................. 44
FIGURE 26: LEVEL MATCH DESIGN FOR RS-232 ......................................................................................... 44
FIGURE 27: REFERENCE DESIGN FOR AIN1&AIN2 ..................................................................................... 47
FIGURE 28: REFERENCE DESIGN FOR AOUT1 ........................................................................................... 48
FIGURE 29: HANDSET INTERFACE DESIGN FOR AOUT2 ........................................................................... 48
FIGURE 30: SPEAKER INTERFACE DESIGN WITH AN AMPLIFIER FOR AOUT2 ....................................... 49
FIGURE 31: EARPHONE INTERFACE DESIGN .............................................................................................. 49
FIGURE 32: LOUD SPEAKER INTERFACE DESIGN ...................................................................................... 50
FIGURE 33: REFERENCE CIRCUIT FOR SIM1 INTERFACE WITH 8-PIN SIM CARD HOLDER ................. 52
FIGURE 34: REFERENCE CIRCUIT FOR SIM1 INTERFACE WITH THE 6-PIN SIM CARD HOLDER ......... 53
FIGURE 35: REFERENCE CIRCUIT FOR SIM2 INTERFACE WITH THE 6-PIN SIM CARD HOLDER ......... 53
FIGURE 36: AMPHENOL C707 10M006 512 2 SIM CARD HOLDER .............................................................. 55
FIGURE 37: MOLEX 91228 SIM CARD HOLDER ............................................................................................ 56
FIGURE 38: REFERENCE CIRCUIT FOR MICRO SD CARD ......................................................................... 58
FIGURE 39: LONG SYNCHRONIZATION & SIGN EXTENSION DIAGRAM ................................................... 60
FIGURE 40: LONG SYNCHRONIZATION & ZERO PADDING DIAGRAM....................................................... 61
FIGURE 41: SHORT SYNCHRONIZATION & SIGN EXTENSION DIAGRAM ................................................. 61
Quectel
Confidential