User's Manual

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.7 • 2015-04-17 29 of 68
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5.3 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 UE866 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