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The power on scenarios is illustrated as following figure.
Figure 12: Timing of power on module
When power on procedure is completed, SIM808 will send following URC to indicate that the module is ready to
operate at fixed baud rate.
RDY
This URC does not appear when autobauding function is active.
Note: User can use AT command “AT+IPR=x” to set a fixed baud rate and save the configuration to non-volatile flash memory.
After the configuration is saved as fixed baud rate, the Code “RDY” should be received from the serial port every time when
SIM808 is powered on. For details, please refer to the chapter “AT+IPR” in document [1].
4.2.1.2 Turn on the SIM808 using the VBUS Signal
The SIM808 will be automatically turned on when a charger is connected to VBUS pin, the switched-off
SIM808 of which VBAT pin voltage is greater than 3.4V. SIM808 will power up.
Figure 13: Timing of power on module
SIM808_Hardware Design_V1.00 2014.03.27
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