User's Guide

LE866 HARDWARE USER GUIDE 1vv0301210 Rev.0 Preliminary 2015-09-02 29 of 68
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Power off
The following flowchart shows the proper Turn-off procedure:
In order to avoid a back powering effect it is recommended to avoid having any
HIGH logic level signal applied to the digital pins of the LE866 when the module
is powered off or during an ON/OFF transition.
Modem OFF Proc
AT#SYSHALT
10s Timeout
Disconnect PWR Supply
Modem ON Proc.
Delay 1.5s