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Smart Machine Smart DecisionBog'liq SIM800L Smart Machine Smart Decision
SIM800H&SIM800L_Hardware Design_V2.02 8 2015-07-27
Figure Index
FIGURE 1: SIM800H&SIM800L FUNCTIONAL DIAGRAM ...................................................................................... 14
FIGURE 2: PIN ASSIGNMENT (TOP VIEW)................................................................................................................ 15
FIGURE 3: DIMENSIONS OF SIM800H&SIM800L (UNIT: MM)............................................................................... 18
FIGURE 4: RECOMMENDED PCB FOOTPRINT OUTLINE (UNIT: MM) ................................................................ 19
FIGURE 5: REFERENCE CIRCUIT OF THE VBAT INPUT......................................................................................... 20
FIGURE 6: REFERENCE CIRCUIT OF THE LDO POWER SUPPLY ......................................................................... 20
FIGURE 7: REFERENCE CIRCUIT OF THE DC-DC POWER SUPPLY..................................................................... 21
FIGURE 8: VBAT VOLTAGE DROP DURING TRANSMIT BURST........................................................................... 21
FIGURE 9: THE MINIMAL VBAT VOLTAGE REQUIREMENT AT VBAT DROP .................................................... 22
FIGURE 10: POWERED ON/OFF MODULE USING TRANSISTOR.......................................................................... 22
FIGURE 11: POWERED ON/OFF MODULE USING BUTTON .................................................................................. 22
FIGURE 12: TIMING OF POWER ON MODULE......................................................................................................... 23
FIGURE 13: TIMING OF POWER DOWN SIM800H&SIM800L BY PWRKEY......................................................... 23
FIGURE 14:TIMING OF RESTART SIM800H&SIM800L............................................................................................ 25
FIGURE 15: RESET CIRCUIT........................................................................................................................................ 25
FIGURE 16: RESET TIMING SEQUENCE.................................................................................................................... 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: RESISTOR MATCHING CIRCUIT ........................................................................................................... 31
FIGURE 22 : DIODE ISOLATION CIRCUIT................................................................................................................. 31
FIGURE 23: TX LEVEL MATCHING CIRCUIT ........................................................................................................... 31
FIGURE 24: RX LEVEL MATCHING CIRCUIT........................................................................................................... 32
FIGURE 25: USB REFERENCE CIRCUIT .................................................................................................................... 32
FIGURE 26: CONNECTION FOR SOFTWARE UPGRADING AND DEBUGGING.................................................. 33
FIGURE 27: RI BEHAVIOUR OF VOICE CALLING AS A RECEIVER...................................................................... 34
FIGURE 28: RI BEHAVIOUR OF DATA CALLING AS A RECEIVER........................................................................ 34
FIGURE 29: RI BEHAVIOUR OF URC OR RECEIVE SMS ........................................................................................ 35
FIGURE 30: RI BEHAVIOUR AS A CALLER ............................................................................................................... 35
FIGURE 31: SPEAKER REFERENCE CIRCUIT .......................................................................................................... 36
FIGURE 32: SPEAKER WITH AMPLIFIER REFERENCE CIRCUIT ......................................................................... 37
FIGURE 33: REFERENCE CIRCUIT OF THE 8-PIN SIM CARD HOLDER............................................................... 38
FIGURE 34: REFERENCE CIRCUIT OF THE 6-PIN SIM CARD HOLDER............................................................... 39
FIGURE 35: MOLEX 91228 SIM CARD HOLDER ...................................................................................................... 40
FIGURE 36: AMPHENOL C707 10M006 512 SIM CARD HOLDER........................................................................... 41
FIGURE 37: PCM REFERENCE CIRCUIT.................................................................................................................... 43
FIGURE 38: LCD REFERENCE CIRCUIT .................................................................................................................... 43
FIGURE 39: SD REFERENCE CIRCUIT ....................................................................................................................... 43
FIGURE 40: 25 KEYS REFERENCE CIRCUIT............................................................................................................. 44
FIGURE 41: 50 KEYS REFERENCE CIRCUIT............................................................................................................. 45
FIGURE 42: KEYPAD REFERENCE CIRCUIT ............................................................................................................ 45
FIGURE 43: KEYPAD DETECTED ............................................................................................................................... 45
FIGURE 44: GPIO TIMING SEQUENCES .................................................................................................................... 47
FIGURE 45: REFERENCE CIRCUIT OF PWM DRIVER BUZZER ............................................................................ 48
FIGURE 46: REFERENCE CIRCUIT OF NETLIGHT .................................................................................................. 49
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