User's Manual

HE910 Hardware User Guide
1vv0300925 Rev.9 – 07-02-2012
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5 Power Supply
The power supply circuitry and board layout are a very important part in the full product
design and they strongly reflect on the product overall performances, hence read
carefully the requirements and the guidelines that will follow for a proper design.
5.1 Power Supply Requirements
The external power supply must be connected to VBATT & VBATT_PA signals and must
fulfil the following requirements:
POWER SUPPLY
Nominal Supply Voltage
3.8 V
Normal Operating Voltage Range
3.40 V÷ 4.20 V
Extended Operating Voltage Range
3.20 V÷ 4.20 V
NOTE:
The Operating Voltage Range MUST never be exceeded; care must be taken in order to
fulfil min/max voltage requirement.
NOTE:
Overshoot voltage (regarding MAX Extended Operating Voltage) and drop in voltage
(regarding MIN Extended Operating Voltage) MUST never be exceeded;
ely assumption
and application of the HW User guide suggestions.