LTE Standard Module Series
EG91 Series Hardware Design
EG91_Series_Hardware_Design 39 / 106
1. Please make sure that VBAT is stable before pulling down PWRKEY pin. The time between them is
no less than 30ms.
2. PWRKEY can be pulled down directly to GND with a recommended 10KΩ resistor if module
needs to be powered on automatically and shutdown is not needed.
3.7.2. Turn off Module
Either of the following methods can be used to turn off the module:
Use the PWRKEY pin.
Use AT+QPOWD command.
3.7.2.1. Turn off Module Using the PWRKEY Pin
Driving the PWRKEY pin to a low level voltage for at least 650ms, the module will execute power-off
procedure after the PWRKEY is released. The power-off scenario is illustrated in the following figure.
Figure 13: Timing of Turning off Module
3.7.2.2. Turn off Module Using AT Command
It is also a safe way to use AT+QPOWD command to turn off the module, which is similar to turning off the
module via PWRKEY pin.
Please refer to document [2] for details about the AT+QPOWD command.
NOTES
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