• Note: For timing about STATUS, please reference to the chapter “4.2 power on/down scenarios” 4.16.1. STATUS Multiplexing Function
  • Note: Multiplexing function need different software supply. 4.17. LED Interface
  • SIM800HSIM800L_Hardware Design_V2.02 50 2015-07-27 Smart Machine Smart Decision
  • Unit ISINK0 - 24 mA ISINK1 60 - 100 mA Note: Isink0 provide 6-current-level steps of up to 24mA.
    		•

     Operating Status Indication




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    4.16. Operating Status Indication 
    The pin4 is for operating status indication of the module. The pin output is high when module is powered on, 
    and output is low when module is powered down. 
    Table 36: Pin definition of the STATUS 
    Pin name 
    Pin number 
    Description 
    STATUS 
    4 
    Operating status indication 
    Note: For timing about STATUS, please reference to the chapter “4.2 power on/down scenarios” 
     
    4.16.1. STATUS Multiplexing Function 
    Table 37: STATUS multiplexing function 
    Pin name 
    Pin number 
    Mode 0(default) 
    Mode 1 
    STATUS 
    4 
    STATUS 
    GPIO4 
    Note: Multiplexing function need different software supply.
     
    4.17. LED Interface 
    SIM800H&SIM800L provides two LED driver pin. The two pin are open-drain output.
    Table 38: Pin definition of the LED 
    Pin name 
    Pin number 
    Description 
    ISINK0 
    47 
    Sink current for LCM module 
    ISINK1 
    46 
    Sink current for keypad LED 
    Reference circuit is recommended in the following figure: 
    SIM800H&SIM800L_Hardware Design_V2.02 50 2015-07-27 

    Smart Machine Smart Decision 
    Figure 47: LED driver reference circuit
     
    Table 39: ISINK specification 
    Pin name 
    Min
    Typ 
    Max 
    Unit 
    ISINK0 
    - 
    24 
    mA 
    ISINK1 
    60 
    - 
    100 
    mA 
    Note: Isink0 provide 6-current-level steps of up to 24mA. 
    4.18. RF Synchronization Signal 
    The synchronization signal serves to indicate growing power consumption during the transmit burst. The signal 
    is generated by the RF_SYNC pin. 

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