User's Manual

CL865-DUAL Hardware User Guide
1vv0301104 Rev.1 – 2014-03-07
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
Reserved. Page 24 of 70
Mod. 0805 2011-07 Rev.2
6. 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 performance, hence read the
requirements carefully and the guidelines that will follow for a proper design.
6.1. Power Supply Requirements
The external power supply must be connected to VBATT & VBATT_PA signals and must
fulfill the following requirements:
POWER SUPPLY
Nominal Supply Voltage
3.8 V
Normal Operating Voltage Range
3.4 V ~ 4.2 V
Extended Operating Voltage Range
3.4 V ~ 4.5 V
NOTE:
The Operating Voltage Range MUST never be exceeded. Special 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.
Behavior in the extended operating voltage range might deviate from 3GPP2 specification.