User's Manual

LE910 Hardware User Guide
1vv0301089 Rev.3 – 09-06-2014
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 27 of 79
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.
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
3.30 V÷ 4.20 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 3.3 V to power on the module
NOTE:
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.