User's Guide

UL865 Hardware User Guide
1VV0301050 Rev 2 – 2013-10-09
The following flow chart shows the proper turnoff procedure:
NOTE:
In order to prevent a back powering effect it is recommended to avoid having any HIGH
logic level signal applied to the digital pins of the UL865 when the module is powered off
or during an ON/OFF transition.
Modem OFF Proc.
AT#SYSHALT
Disconnect PWR supply
10s timeout
Modem ON Proc.
Delay 1.5s