Data Sheet

Smart Machine Smart Decision
SIM800F_Hardware Design_V1.00 8 2015-07-31
Figure Index
FIGURE 1: SIM800F FUNCTIONAL DIAGRAM ......................................................................................................... 14
FIGURE 2: SIM800F PIN OUT DIAGRAM (TOP VIEW)............................................................................................. 15
FIGURE 3: DIMENSIONS OF SIM800F（UNIT: MM） ............................................................................................. 18
FIGURE 4: RECOMMENDED PCB FOOTPRINT OUTLINE（UNIT: MM）............................................................ 19
FIGURE 5: REFERENCE CIRCUIT OF THE LDO POWER SUPPLY ......................................................................... 20
FIGURE 6: REFERENCE CIRCUIT OF THE DC-DC POWER SUPPLY..................................................................... 20
FIGURE 7: REFERENCE CIRCUIT OF THE VBAT INPUT......................................................................................... 21
FIGURE 8: VBAT VOLTAGE DROP DURING MAX POWER TRANSMITTING...................................................... 21
FIGURE 9: THE LOW LIMIT OF VBAT VOLTAGE DROP DURING TRANSMITTING .......................................... 22
FIGURE 10: POWERED ON/DOWN MODULE USING TRANSISTOR..................................................................... 22
FIGURE 11: POWERED ON/DOWN MODULE USING BUTTON ............................................................................. 22
FIGURE 12: TIMING OF POWER ON MODULE......................................................................................................... 23
FIGURE 13: TIMING OF POWER OFF SIM800F BY PWRKEY................................................................................. 23
FIGURE 14: TIMING OF RESTART SIM800F .............................................................................................................. 25
FIGURE 15: RESET CIRCUIT........................................................................................................................................ 25
FIGURE 16: RESET TIMING ......................................................................................................................................... 26
FIGURE 17: RTC SUPPLY FROM CAPACITOR........................................................................................................... 28
FIGURE 18: RTC SUPPLY FROM NON-CHARGEABLE BATTERY ......................................................................... 28
FIGURE 19: RTC SUPPLY FROM RECHARGEABLE BATTERY .............................................................................. 28
FIGURE 20: CONNECTION OF THE SERIAL INTERFACES..................................................................................... 30
FIGURE 21: LEVEL CONVERTING BY RESISTOR.................................................................................................... 31
FIGURE 22: LEVEL CONVERTING BY DIODES........................................................................................................ 31
FIGURE 23: TX LEVEL CONVERTING BY TRANSISTOR........................................................................................ 31
FIGURE 24: RX LEVEL CONVERTING BY TRANSISTOR ....................................................................................... 32
FIGURE 25: USB REFERENCE CIRCUIT .................................................................................................................... 32
FIGURE 26: CONNECTION FOR SOFTWARE UPGRADING AND DEBUGGING THROUGH UART .................. 33
FIGURE 27: RI BEHAVIOUR OF VOICE CALLING AS A RECEIVER...................................................................... 34
FIGURE 28: RI BEHAVIOUR OF URC OR RECEIVE SMS ........................................................................................ 34
FIGURE 29: RI BEHAVIOUR AS A CALLER ............................................................................................................... 34
FIGURE 30: SPEAKER REFERENCE CIRCUIT .......................................................................................................... 35
FIGURE 31 : MICROPHONE REFERENCE CIRCUIT................................................................................................. 35
FIGURE 32: REFERENCE CIRCUIT OF THE 8-PIN SIM CARD HOLDER............................................................... 37
FIGURE 33: REFERENCE CIRCUIT OF THE 6-PIN SIM CARD HOLDER............................................................... 37
FIGURE 34: MOLEX 91228 SIM CARD HOLDER ...................................................................................................... 38
FIGURE 35: AMPHENOL C707 10M006 5122 SIM CARD HOLDER......................................................................... 39
FIGURE 36: CONNECTION OF DISP INTERFACE..................................................................................................... 40
FIGURE 37: REFERENCE CIRCUIT OF THE KEYPAD INTERFACE ....................................................................... 41
FIGURE 38: RF_SYNC SIGNAL DURING TRANSMIT BURST ................................................................................ 42
FIGURE 39: REFERENCE CIRCUIT OF NETLIGHT .................................................................................................. 44
FIGURE 40: REFERENCE CIRCUIT OF PWM DRIVE BUZZER ............................................................................... 45
FIGURE 41: KPLED DRIVER REFERENCE CIRCUIT................................................................................................ 46
FIGURE 42: GSM ANTENNA MATCHING CIRCUIT ................................................................................................. 47
FIGURE 43: GSM ANTENNA MATCHING CIRCUIT WITHOUT RF CONNECTOR ............................................... 47
FIGURE 44: BLUETOOTH ANTENNA MATCHING CIRCUIT .................................................................................. 48
FIGURE 45: PIN ASSIGNMENT.................................................................................................................................... 49