Figure 11: Timing of Turning off Module
During power-down procedure, module will send out URC “NORMAL POWER DOWN” via URC port first,
then log off network and save important data. After logging off, module sends out “POWERED DOWN”
and shut down the internal power supply. The power on VBAT pins is not allowed to turn off before the
URC “POWERED DOWN” is output to avoid data loss. If logging off is not done within 60s, module will
shut down internal power supply forcibly.
After that moment, the module enters the power down mode, no other AT commands can be executed
and only the RTC is still active. The power down mode can also be indicated by the STATUS pin.
3.7.2.2. Turn off Module Using AT Command
It is also a safe way to use AT command AT+QPOWD to turn off the module, which is similar to turning off
the module via PWRKEY Pin
Please refer to document [1] for details about the AT command of AT+QPOWD.
3.7.2.3. Automatic Shutdown
The module will constantly monitor the voltage applied on the VBAT, if the voltage ≤ 3.5V, the following
URC will be presented:
+QIND: “vbatt”,-1
If the voltage ≥ 4.21V, the following URC will be presented:
+QIND: “vbatt”,1
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