Product Info

LTE Standard Module Series
EC25 Series Hardware Design
EC25_Series_Hardware_Design 48 / 134
3.7.2.1. Turn off Module Using the PWRKEY Pin
Driving the PWRKEY pin to a low level voltage for at least 650 ms, the module will execute power-off
procedure after the PWRKEY is released. The power-off scenario is illustrated in the following figure.
VBAT
PWRKEY
29.5 s
650 ms
RUNNING
Power-down procedure
OFF
Module
Status
STATUS
(OD)
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 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 the AT command, please keep PWRKEY at high level after the
execution of the command. Otherwise, the module will be turned on again after successfully turn-off.
3.8. Reset Module
The RESET_N pin can be used to reset the module. And module can be reset by driving RESET_N low
for 150–460 ms.
NOTES