Sunsea AIoT SimCom SIM7090G User Manual page 24

SIM7090G User Manual V1.01
NOTE
Under-voltage warning function and under-voltage power-off function are disabled by default. For more
information about these AT commands, please refer to Document [1].
3.2 Power on/Power off/Reset Function
3.2.1 Turn on Module Using the PWRKEY Pin
SIM7090G can be powered on by briefly pulling the PWRKEY pin to ground.
The PWRKEY pin has been pulled up with a diode to 1.8V internally, so it does not need to be pulled up
externally. It is strongly recommended to put an ESD protection diode close to the PWRKEY pin, as it would
strongly enhance the ESD performance of PWRKEY pin.
The PWRKEY pin has its own reset function. The reset time is determined by the internal timer (default is 15
seconds). After the PWRKEY is pulled low, the module will be reset after 15 seconds. Therefore, it is not
recommended to connect PWRKEY to GND all the time in external circuit design.
Please refer to the following figure for the recommended reference circuit.
Figure 6: Reference power on/off circuit
The power-on scenarios are illustrated in the following figure.
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