LE910Cx Hardware Design Guide
1VV0301298 Rev.40 Page 50 of 149 2023-03-16
Not Subject to NDA
Warning: Carefully
follow the recommended procedure for shut down
and power off.
Failure to follow the recommended shut-down and power off
procedures might damage the device and consequently void the
warranty.
Fast Power Down
The gentle power down procedure is described in chapter 5.3.1 and 5.3.2. It normally
takes more than 15 seconds to de-attach network and make LE910Cx internal filesystem
properly closed.
In the event of an unwanted power supply loss, LE910Cx can be switched off without any
risk of filesystem data corruption by implementing Fast Power Down feature.
The Fast Power Down feature permits to reduce the current consumption and the time-
to-power off to minimum values.
Note: Refer to LE910Cx series AT command reference guide (Fast
power down - #FASTSHDN) in order to set up detailed AT command.
5.5.1. Fast Shut Down by Hardware
The Fast Shut Down is triggered by a GPIO. Customers wishing to implement the Fast
Shut Down should configure a GPIO as the trigger pin for the Fast Shut Down through AT
command. The high-to-low transition of a GPIO triggers the Fast Shut Down and then the
LE910Cx module turns off within 30ms.
Below is the example hardware configuration for the Fast Shut Down.
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