3 Application Interfaces
30
⚫ Hardware power-off: The module is powered off when the PWRKEY pin is pulled down for
at least 3.1s.
⚫ Software power-off: The module is powered off through the AT+CPWROFF command. This
mode applies only to non-main control modules.
When the module is working properly, do not cut off the power supply of the
module immediately to avoid damaging the internal flash and causing data loss.
It is strongly recommended to power off the module by a normal way before
cutting off the power supply.
When using the software to power off the module, ensure that the PWRKEY
pin is always at the high level after the power-off command is executed.
Otherwise, the module will automatically power on again.
Software command shutdown cannot be realized during automatic power-on
design.
Avoid the low voltage power-off scenario when designing automatic power-on,
otherwise it may lead to the failure of secondary power-on.
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