LTE Standard Module Series
EC200U_Series_Hardware_Design 36 / 94
3.7.2.1. Turn off Module with PWRKEY
Driving PWRKEY low for at least 3 s and releasing it, the module executes power-down procedure.
The power-down scenario is illustrated in the following figure.
VBAT
PWRKEY
≥
30 s
≥
3
s
Running
Power-down procedure
OFF
Module
Status
STATUS
(DO)
Figure 13: Power-down Timing
3.7.2.2. Turn off Module with AT Command
It is also a safe way to use
AT+QPOWD
to turn off the module, which is similar to the procedure of turning
off the module via PWRKEY.
Please refer to
document [2]
for details about
AT+QPOWD
.
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, can the
power supply be cut off.
2. When keeping the PWRKEY to the ground, the module can only be forced to turn off by cutting off
the VBAT power supply considering that the module cannot be turned off with AT command.
Therefore, it is recommended that you can turn on or turn off the module by pulling up and pulling
down the PWEKEY instead of keeping the PWRKEY to the ground.
3. When being turned off, the module will log out of the network. The time for logging out relates to its
network status. Thus, please pay attention to the shutdown time in your design because the actual
shutdown time varies with the network status.
NOTE
