User's Manual

LTE Module Series
EC25Hardware Design
EC25_Hardware_DesignConfidential / Released 37 / 90
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+QPOWDcommand to turn off the module, which is similar to turning off the
module via PWRKEY pin.
Please refer todocument [2] for details about AT+QPOWD command.
Inorder to avoid damaging internal flash, please do not switch off the power supply when the module
works normally. Only after the module is shutdown by PWRKEY or AT command, the power supply can be
cut 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.
Table 8: RESET_N Pin Description
Pin Name Pin No. Description DC Characteristics Comment
RESET_N 20 Reset the module
V
IH
max=2.1V
V
IH
min=1.3V
V
IL
max=0.5V
NOTE