M10 Hardware Design
It can caused the module logoff from the network and allow the software to enter into a secure
state and save data before completely disconnect the power supply.
Before the completion of the switching off procedure the module will send out result code:
NORMAL POWER DOWN
After this moment, the AT commands can’t be executed. The module enters the POWER DOWN
mode, only the RTC is still active. POWER DOWN can also be indicated by VDD_EXT pin,
which is a low level voltage in this mode.
PWRKEY
（INPUT）
VDD_EXT
（OUTPUT）
V
IL
<0.3*VBAT
V
IH
>0.7*VBAT
1s >Pulldown > 0.6s
Hiz
Logout net about 2s to 8s
Figure 8: Timing of turn off system
3.4.2.2 Turn off module using AT command
You can use an AT command “AT+QPOWD=1” to turn off the module. This command will let
the module to log off from the network and allow the software to enter into a secure state and save
data before completely disconnecting the power supply.
Before the completion of the switching off procedure the module will send out result code:
NORMAL POWER DOWN
After this moment, the AT commands can’t be executed. The module enters the POWER DOWN
mode, only the RTC is still active. POWER DOWN can also be indicated by VDD_EXT pin,
which is a low level voltage in this mode.
Please refer to document [1] for detail about the AT command of “AT+QPOWD”.
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 ≤ 3.5V, the
M10_HD_V1.00 - 27 -
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