User's Manual

UE910 3G HARDWARE USER GUIDE 1vv0301171 Rev.3 • 2015-04-17 32 of 78
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For example:
1- Let's assume you need to drive the ON_OFF* pad with a totem pole output of a +3/5 V microcontroller
(uP_OUT1):
2- Let's assume you need to drive the ON_OFF* pad directly with an ON/OFF button:
WARNING:
It is recommended to set the ON_OFF* line LOW to power on the module only
after VBATT is higher than 3.22V.
In case this condition it is not satisfied you could use the HW_SHUTDOWN*
line to recover it and then restart the power on activity using the ON_OFF *
line.
An example of this is described in the following diagram.