User's Manual

GSM/GPRS Module Series
M85 Hardware Design
M85_Hardware_Design Confidential / Released 7 / 88
Figure Index
FIGURE 1: MODULE FUNCTIONAL DIAGRAM ............................................................................................... 15
FIGURE 2: PIN ASSIGNMENT ......................................................................................................................... 17
FIGURE 3: VOLTAGE RIPPLE DURING TRANSMITTING .............................................................................. 24
FIGURE 4: REFERENCE CIRCUIT FOR THE VBAT INPUT ........................................................................... 25
FIGURE 5: REFERENCE CIRCUIT FOR POWER SUPPLY ............................................................................ 25
FIGURE 6: TURN ON THE MODULE WITH AN OPEN-COLLECTOR DRIVER .............................................. 26
FIGURE 7: TURN ON THE MODULE WITH A BUTTON .................................................................................. 27
FIGURE 8: TURN-ON TIMING .......................................................................................................................... 27
FIGURE 9: TURN-OFF TIMING ........................................................................................................................ 28
FIGURE 10: AN OPEN-COLLECTOR DRIVER FOR EMERG_OFF ................................................................ 30
FIGURE 11: REFERENCE CIRCUIT FOR EMERG_OFF BY USING BUTTON .............................................. 31
FIGURE 12: TIMING OF RESTARTING SYSTEM ............................................................................................ 31
FIGURE 13: TIMING OF RESTARTING SYSTEM AFTER EMERGENCY SHUTDOWN ................................ 32
FIGURE 14: VRTC IS SUPPLIED BY A NON-CHARGEABLE BATTERY ........................................................ 35
FIGURE 15: VRTC IS SUPPLIED BY A RECHARGEABLE BATTERY ............................................................ 35
FIGURE 16: VRTC IS SUPPLIED BY A CAPACITOR ...................................................................................... 36
FIGURE 17: REFERENCE DESIGN FOR FULL-FUNCTION UART ................................................................ 39
FIGURE 18: REFERENCE DESIGN FOR UART PORT ................................................................................... 40
FIGURE 19: REFERENCE DESIGN FOR UART PORT WITH HARDWARE FLOW CONTROL .................... 40
FIGURE 20: REFERENCE DESIGN FOR FIRMWARE UPGRADE ................................................................. 41
FIGURE 21: REFERENCE DESIGN FOR DEBUG PORT ............................................................................... 41
FIGURE 22: REFERENCE DESIGN FOR AUXILIARY UART PORT ............................................................... 42
FIGURE 23: LEVEL MATCH DESIGN FOR 3.3V SYSTEM .............................................................................. 42
FIGURE 24: SKETCH MAP FOR RS-232 INTERFACE MATCH ...................................................................... 43
FIGURE 25: REFERENCE DESIGN FOR AIN1&AIN2 ..................................................................................... 46
FIGURE 26: HANDSET INTERFACE DESIGN FOR AOUT1 ........................................................................... 46
FIGURE 27: SPEAKER INTERFACE DESIGN WITH AN AMPLIFIER FOR AOUT1 ....................................... 47
FIGURE 28: HANDSET INTERFACE DESIGN FOR AOUT2 ........................................................................... 47
FIGURE 29: SPEAKER INTERFACE DESIGN WITH AN AMPLIFIER FOR AOUT2 ....................................... 48
FIGURE 30: EARPHONE INTERFACE DESIGN .............................................................................................. 48
FIGURE 31: LOUD SPEAKER INTERFACE DESIGN ...................................................................................... 49
FIGURE 32: REFERENCE CIRCUIT FOR SIM1 INTERFACE WITH 8-PIN SIM CARD HOLDER ................. 51
FIGURE 33: REFERENCE CIRCUIT FOR SIM1 INTERFACE WITH THE 6-PIN SIM CARD HOLDER ......... 52
FIGURE 34: REFERENCE CIRCUIT FOR SIM2 INTERFACE WITH THE 6-PIN SIM CARD HOLDER ......... 52
FIGURE 35: REFERENCE CIRCUIT FOR SD CARD ...................................................................................... 54
FIGURE 36: LONG SYNCHRONIZATION & SIGN EXTENSION DIAGRAM ................................................... 57
FIGURE 37: LONG SYNCHRONIZATION & ZERO PADDING DIAGRAM....................................................... 57
FIGURE 38: SHORT SYNCHRONIZATION & SIGN EXTENSION DIAGRAM ................................................. 57
FIGURE 39: SHORT SYNCHRONIZATION & ZERO PADDING DIAGRAM .................................................... 58
FIGURE 40: REFERENCE DESIGN FOR PCM ............................................................................................... 58
FIGURE 41: RI BEHAVIOR OF VOICE CALLING AS A RECEIVER ................................................................ 61
FIGURE 42: RI BEHAVIOR AS A CALLER ....................................................................................................... 61