LTE Module Series
EG21-G Hardware Design
EG21-G_Hardware_Design 36 / 100
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-down
procedure after the PWRKEY is released. The power-off scenario is illustrated in the following figure.
VBAT
PWRKEY
≥29.5s
≥650ms
RUNNING
Power-down procedure
OFF
Module
Status
STATUS
(OD)
Figure 13: Power-off Scenario of 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 AT+QPOWD command.
1. In order to avoid damaging internal flash, please do not switch off the power supply when the module
works normally. Only after the module is shut down by PWRKEY or AT command, then the power
supply can be cut off.
2. When turning off module with AT command, please keep PWRKEY at high level after the execution of
power-off command. Otherwise the module will be turned on again after successfully turn-off.
3.8. Reset the Module
The RESET_N pin can be used to reset the module. The module can be reset by driving RESET_N to a
low level voltage for time between 150ms and 460ms.
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