Smart Machine Smart Decision
SIM800C_Hardware_Design_V1.00 20 2014-10-30
VIL<0.7V
Undefind
Active
1.2s
VBAT
PWRKEY
(INPUT)
t>3s
VDD_EXT
STATUS
t>1s
Serial port
T>1.4s
Figure 12: Timing of power on module
When power on procedure is completed, SIM800C 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: Customer 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 SIM800C is powered on. For details, please refer to the chapter
“AT+IPR” in document [1].
4.2.2. Power down SIM800C
SIM800C will be powered down in the following situations：
Normal power down procedure: power down SIM800C by the PWRKEY pin.
Normal power down procedure: power down SIM800C by AT command “AT+CPOWD=1”.
Abnormal power down: over-voltage or under-voltage automatic power down.
Abnormal power down: over-temperature or under-temperature automatic power down.
4.2.2.1. Power down SIM800C by the PWRKEY Pin
Customer can power down SIM800C 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.
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