Users Manual

GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 7 / 82
Figure Index
FIGURE 1: MODULE FUNCTIONAL DIAGRAM ..................................................................................... 16
FIGURE 2: PIN ASSIGNMENT ............................................................................................................... 18
FIGURE 3: VOLTAGE RIPPLE DURING TRANSMITTING ..................................................................... 25
FIGURE 4: REFERENCE CIRCUIT FOR THE VBAT INPUT .................................................................. 25
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: TIMING OF RESTARTING SYSTEM .................................................................................. 31
FIGURE 11: VRTC IS SUPPLIED BY A NON-CHARGEABLE BATTERY ............................................... 34
FIGURE 12: VRTC IS SUPPLIED BY A RECHARGEABLE BATTERY ................................................... 34
FIGURE 13: VRTC IS SUPPLIED BY A CAPACITOR ............................................................................. 35
FIGURE 14: REFERENCE DESIGN FOR FULL-FUNCTION UART ...................................................... 39
FIGURE 15: REFERENCE DESIGN FOR UART PORT ......................................................................... 39
FIGURE 16: REFERENCE DESIGN FOR UART PORT WITH HARDWARE FLOW CONTROL............ 40
FIGURE 17: REFERENCE DESIGN FOR FIRMWARE UPGRADE ....................................................... 40
FIGURE 18: REFERENCE DESIGN FOR DEBUG PORT ...................................................................... 41
FIGURE 19: REFERENCE DESIGN FOR AUXILIARY UART PORT ...................................................... 41
FIGURE 20: LEVEL MATCH DESIGN FOR 3.3V SYSTEM .................................................................... 42
FIGURE 21: SKETCH MAP FOR RS-232 INTERFACE MATCH ............................................................ 43
FIGURE 22: REFERENCE DESIGN FOR AIN ........................................................................................ 45
FIGURE 23: HANDSET INTERFACE DESIGN FOR AOUT1 .................................................................. 46
FIGURE 24: SPEAKER INTERFACE DESIGN WITH AN AMPLIFIER FOR AOUT1 .............................. 46
FIGURE 25: HANDSET INTERFACE DESIGN FOR AOUT2 .................................................................. 47
FIGURE 26: SPEAKER INTERFACE DESIGN WITH AN AMPLIFIER FOR AOUT2 .............................. 47
FIGURE 27: EARPHONE INTERFACE DESIGN .................................................................................... 48
FIGURE 28: LONG SYNCHRONIZATION DIAGRAM ............................................................................. 51
FIGURE 29: SHORT SYNCHRONIZATION DIAGRAM .......................................................................... 51
FIGURE 30: REFERENCE DESIGN FOR PCM...................................................................................... 52
FIGURE 31: REFERENCE CIRCUIT FOR SIM INTERFACE WITH THE 6-PIN SIM CARD HOLDER ... 54
FIGURE 32: REFERENCE CIRCUIT FOR MICRO SD CARD ................................................................ 56
FIGURE 33: RI BEHAVIOR OF VOICE CALLING AS A RECEIVER ....................................................... 58
FIGURE 34: RI BEHAVIOR AS A CALLER.............................................................................................. 59
FIGURE 35: RI BEHAVIOR OF URC OR SMS RECEIVED .................................................................... 59
FIGURE 36: REFERENCE DESIGN FOR NETLIGHT ............................................................................ 60
FIGURE 37: RFTXMON SIGNAL DURING BURST TRANSMISSION .................................................... 61
FIGURE 38: RFTXMON SIGNAL DURING CALL ................................................................................... 62
FIGURE 39: REFERENCE DESIGN FOR GSM ANTENNA ................................................................... 64
FIGURE 40: RF SOLDERING SAMPLE ................................................................................................. 66
FIGURE 41: REFERENCE DESIGN FOR BLUETOOTH ANTENNA ...................................................... 67