SimCom SIM800L User Manual

Smart Machine Smart Decision
SIM800L(MT6261)_Hardware Design_V1.01 8 2016-07-07
Figure Index
FIGURE 1: SIM800L FUNCTIONAL DIAGRAM ......................................................................................................... 14
FIGURE 2: PIN ASSIGNMENT (TOP VIEW) ................................................................................................................ 15
FIGURE 3: DIMENSIONS OF 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 SUPP LY ......................................................................... 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 V B AT 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 SIM800L BY PWRKEY ............................................................................ 23
FIGURE 14: TIMING OF RESTART SIM800L .............................................................................................................. 24
FIGURE 15: RESET CIRCUIT ........................................................................................................................................ 25
FIGURE 16: RESET TIMING SEQUENCE .................................................................................................................... 25
FIGURE 17: RTC SUPPLY FROM CAPACITOR ........................................................................................................... 27
FIGURE 18: RTC SUPPLY FROM NON-CHARGEABLE BATTERY.......................................................................... 27
FIGURE 19: RTC SUPPLY FROM RECHARGEABLE BATTERY .............................................................................. 27
FIGURE 20: CONNECTION OF THE SERIAL INTERFACES ..................................................................................... 29
FIGURE 21: RESISTOR MATCHING CIRCUIT ........................................................................................................... 30
FIGURE 22: DIODE ISOLATION CIRCUIT .................................................................................................................. 30
FIGURE 23: TX LEVEL MATCHING CIRCUIT ........................................................................................................... 30
FIGURE 24: RX LEVEL MATCHING CIRCUIT ........................................................................................................... 31
FIGURE 25: USB REFERENCE CIRCUIT .................................................................................................................... 31
FIGURE 26: CONNECTION FOR SOFTWARE UPGRADING AND DEBUGGING .................................................. 32
FIGURE 27: RI BEHAVIOUR OF VOICE CALLING AS A RECEIVER ...................................................................... 33
FIGURE 28: RI BEHAVIOUR OF URC OR RECEIVE SMS ........................................................................................ 33
FIGURE 29: RI BEHAVIOUR AS A CALLER ............................................................................................................... 33
FIGURE 30: SPEAKER REFERENCE CIRCUIT .......................................................................................................... 34
FIGURE 31: SPEAKER WITH AMPLIFIER REFERENCE CIRCUIT ......................................................................... 35
FIGURE 32: REFERENCE CIRCUIT OF THE 8-PIN SIM CARD HOLDER ............................................................... 36
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 512 SIM CARD HOLDER ........................................................................... 39
FIGURE 36: PCM REFERENCE CIRCUIT .................................................................................................................... 40
FIGURE 37: 25 KEYS REFERENCE CIRCUIT ............................................................................................................. 41
FIGURE 38: 50 KEYS REFERENCE CIRCUIT ............................................................................................................. 41
FIGURE 39: KEYPAD REFERENCE CIRCUIT ............................................................................................................ 42
FIGURE 40: KEYPAD DETECTED ............................................................................................................................... 42
FIGURE 41: GPIO TIMING SEQUENCES .................................................................................................................... 43
FIGURE 42: REFERENCE CIRCUIT OF PWM DRIVER BUZZER ............................................................................ 44
FIGURE 43: REFERENCE CIRCUIT OF NETLIGHT................................................................................................... 45
FIGURE 44: LED DRIVER REFERENCE CIRCUIT ..................................................................................................... 46
FIGURE 45: RF_SYNC SIGNAL DURING TRANSMIT BURST ................................................................................ 47
FIGURE 46: GSM ANTENNA MATCHING CIRCUIT.................................................................................................. 47
SIMCOM CONFIDENTIAL FILE

SimCom SIM800L Specifications

General

Brand	SimCom
Model	SIM800L
Category	Recording Equipment
Language	English