User's Manual

COMPANY CONFIDENTIAL
8
2.2 Power-up sequence
There are 2 different supplies for module which allows set up independently, therefore
different power-up sequences have to be considered.
1> VBAT is set up before PVDD
This is at least the case when VBAT pin is directly connected to the battery and when
module VBAT is always supplied as soon the system is supplied.
As VEN pin is referred to VBAT pin, VEN voltage shall go high after VBAT has been set.
2> PVDD and VBAT are set up in the same time
It is at least the case when VBAT pin is connected to a PMU/regulator which also supplies
PVDD.