SIM800L datasheet(8/73 Pages) SIMCOM

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SIM800H&SIM800L_Hardware Design_V2.02

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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