User's Manual
LE910 V2 HARDWARE USER GUIDE 1VV0301200 Rev.2 Preliminary • 2015-08-04 21 of 81
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4 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.
4.1 Power Supply Requirements
The external power supply must be connected to VBATT & VBATT_PA signals and must fulfil the following
requirements:
Power Supply
Value
Nominal Supply Voltage
3.8V
Normal Operating Voltage Range
3.40 V÷ 4.20 V
Extended Operating Voltage Range
3.10 V÷ 4.50 V
NOTE:
The Operating Voltage Range MUST never be exceeded; care must be taken when
designing the application’s power supply section to avoid having an excessive voltage
drop. If the voltage drop is exceeding the limits it could cause a Power Off of the module.
The Power supply must be higher than 3.10 V to power on the module.
Overshoot voltage (regarding MAX Extended Operating Voltage) and drop in voltage
(regarding MIN Extended Operating Voltage) MUST never be exceeded;
The “Extended Operating Voltage Range” can be used only with completely assumption
and application of the HW User guide suggestions.