• 4.2.2.1. Power down SIM800HSIM800L by the PWRKEY Pin
  • Figure 13: Timing of power down SIM800HSIM800L by PWRKEY
  • SIM800HSIM800L_Hardware Design_V2.02 24 2015-07-27
  • 4.2.2.2. Power down SIM800HSIM800L by AT Command
    		•

    memory. After the configuration is saved as fixed baud rate, the Code “RDY” should be received from the serial port every time




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    memory. After the configuration is saved as fixed baud rate, the Code “RDY” should be received from the serial port every time 
    when SIM800H&SIM800L is powered on. For details, please refer to the chapter “AT+IPR” in document [1]. 
     
    4.2.2. Power down SIM800H&SIM800L 
    SIM800H&SIM800L will be powered down in the following situations： 
    z Normal power down procedure: power down SIM800H&SIM800L by the PWRKEY pin.
    z Normal power down procedure: power down SIM800H&SIM800L by AT command “AT+CPOWD=1”.
    z Abnormal power down: over-voltage or under-voltage automatic power down. 
    z Abnormal power down: over-temperature or under-temperature automatic power down. 
    4.2.2.1. Power down SIM800H&SIM800L by the PWRKEY Pin 
    Customer can power down SIM800H&SIM800L by pulling down the PWRKEY pin for at least 1 second and 
    release. Please refer to the power on circuit. The power down timing is illustrated in the following figure. 
    Figure 13: Timing of power down SIM800H&SIM800L by PWRKEY 
    This procedure makes the module log off from the network and allows the software to enter into a secure state to 
    SIM800H&SIM800L_Hardware Design_V2.02 23 2015-07-27 

    Smart Machine Smart Decision 
    SIM800H&SIM800L_Hardware Design_V2.02 24 2015-07-27 
    save data before completely shut down. 
    Before the completion of the power down procedure, the module will send URC: 
    NORMAL POWER DOWN 
    At this moment, AT commands can not be executed any more, and only the RTC is still active. Power down mode 
    can also be indicated by STATUS or VDD_EXT, which is at low level at this time.
    4.2.2.2. Power down SIM800H&SIM800L by AT Command 
    SIM800H&SIM800L can be powered down by AT command “AT+CPOWD=1”. This procedure makes the 
    module log off from the network and allows the software to enter into a secure state to save data before 
    completely shut down. 
    Before the completion of the power down procedure, the module will send URC: 

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    memory. After the configuration is saved as fixed baud rate, the Code “RDY” should be received from the serial port every time

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