User's Manual

UE910 3G HARDWARE USER GUIDE 1vv0301171 Rev.3 • 2015-04-17 37 of 78
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A typical circuit is the following:
For example:
Let us assume you need to drive the HW_SHUTDOWN* pad with a totem pole output of a +3/5 V
microcontroller (uP_OUT2):
NOTE:
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 UE910 when the
module is powered off or during an ON/OFF transition.