User's Guide

UL865 Hardware User Guide
1VV0301050 Rev 2 – 2013-10-09
NOTE:
The power supply must be applied either at the same time on pins VBATT and
VBATT_PA.
NOTE:
To guarantee a correct module’s start-up please check that the Power Supply is with a
level >3.22V within 21mS.
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.