M10 Hardware Design
M10_HD_V3.0 - 33 -
data before completely disconnecting the power supply, thus it is a safe way.
Before the completion of the power-down procedure, the module sends out the result code as
shown below:
NORMAL POWER DOWN
After this moment, no other AT commands can be executed. And then the module enters the
POWER DOWN mode, only the RTC is still active. The POWER DOWN mode can also be
indicated by STATUS pin, which is a low level voltage in this mode.
For details about the AT command of “AT+QPOWD”, please refer to document [1].
3.4.2.3. Over-voltage or under-voltage automatic shutdown
The module will constantly monitor the voltage applied on the VBAT, if the voltage is ≤ 3.5V, the
following URC will be presented:
UNDER_VOLTAGE WARNING
If the voltage is ≥ 4.5V, the following URC will be presented:
OVER_VOLTAGE WARNING
The normal input voltage range is 3.3V to 4.6V. If the voltage is > 4.6V or <3.3V, the module
would automatically shutdown itself.
If the voltage is <3.3V, the following URC will be presented:
UNDER_VOLTAGE POWER DOWN
If the voltage is >4.6V, the following URC will be presented:
OVER_VOLTAGE POWER DOWN
Note: These result codes don’t appear when autobauding is active and DTE and DCE are not
correctly synchronized after start-up. The module is recommended to set to a fixed baud rate.
After this moment, no other AT command can be executed, the module logs off from network and
enters POWER DOWN mode, and only RTC is still active. The POWER DOWN mode can also
be indicated by the pin STATUS, which is a low level voltage in this mode.
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