User's Guide

LE910Cx HW User Guide
Doc#: 1VV0301298
Rev. 13.0 Page 50 of 124 2019-07-15
Fast Power Down
The graceful power down procedure is described in chapter 5.1 and 5.2. It normally takes
more than 15 seconds to de-attach network and make LE910Cx internal filesystem
properly closed.
In case of 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 who want 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
LE910Cx module turns off within 30ms.
The following is the example hardware configuration for the Fast Shut Down.