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Hardware Design

  • D2 is the Ring led. D1 is Net LED

SIM800 SeriesHardware Information

Net LED:

  • Off  SIM800H/L is not running 
  • 64ms On/800ms Off  SIM800H/L not registered the network 
  • 64ms On/3000ms Off  SIM800H/L registered the network 
  • 64ms On/800ms Off  GPRS communication is established

Ring LED: when module receives the call or a message, this LED will be off or Flash


Board interface

  • D100  LED indicator 
  • CN101  6pin 2.54mm header interface 
  • J100  GPRS/GSM ANT 
  • J102  BT ANT(only for SIM800H) 
  • CN100  Micro SIM card socket 
  • C102  VRTC(Not mounted by default) 
  • TEST  2.8V 

Common Pin Definition

  • Power supply should provide sufficient current so that the  module  can  work  normally; the peak current is nearly 2A, will NOT work over 4.4V
name pin mark on pcb Description Comment
GND 1 and 6 G ground
Vbat 2 V Power range is from 3.4V to 4.4V.   Zenger diode is strongly recommended to anti surge on VBAT 
PWRkey 3 K Power down  Shorted with GND via R104 by default 
TXD 4 T Transmit Data TTL Series data Output 
RXD 5 R Receives Data  TTL Series data Input 

SIM800C-Full Board

SIM800C dev board dimension
  • Pin Definition
Pin Description Pin Description
GND Power ground VCC_IN power supply pin, input DC5V-20V, used to power the board
RI The kernel ringing pin DTR Data terminal preparation
TXD module serial send pin, TTL level (not directly connected to the RS232 level) RXD module serial receive pin, TTL level (not directly connected to the RS232 level)
U2_R module serial port 2 receive pin U2_T Module serial port 2 transmit pin
V_M This pin is used to convert the TXD and RXD of the GSM module board to the TTL logic of the corresponding target board. This is used to convert the TXD and RXD of the GSM module board to the corresponding TTL logic ADC ADC detection
SPP Core audio output pin SPN Core audio output pin
MC- Core audio input pin MC + Core audio input pin
PWR Pull down this pin to enable the module to be turned on or off BAT lithium battery input pin, 3.3v-4.4v


  • VBAT  MUST  be  lower  than  4.4V,  4.0V  is  recommended,  and  TXD/RXD are TTL level which can be directly connected with MCU.
  • Test pin, sim card voltage: Should confirm whether SIM card is inserted, and voltage test points should be 2.8V. 
  • Bluetooth must have enough current, USB power can not supply enough current


SIM800 Series Application Note:

SIM Series Hardware Design Manual

AT commands

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