User's Manual

GE910 Hardware User Guide

GE910 Hardware User GuideGE910 Hardware User Guide

GE910 Hardware User Guide

1vv0300962 Rev.9-bis3 2013-05-20

Mod. 0805 2011-07 Rev.2

5.3.1.3. Battery Source Power Supply Design Guidelines

• The desired nominal output for the power supply is 3.8V and the maximum voltage

allowed is 4.2V, hence a single 3.7V Li-Ion cell battery type is suited for supplying the

power to the Telit GE910 module.

WARNING:

The three cells Ni/Cd or Ni/MH 3,6 V Nom. battery types or 4V PB types MUST NOT BE

USED DIRECTLY since their maximum voltage can rise over the absolute maximum voltage

for the GE910 and damage it.

NOTE:

DON'T USE any Ni-Cd, Ni-MH, and Pb battery types directly connected with GE910. Their use

can lead to overvoltage on the GE910 and damage it. USE ONLY Li-Ion battery types.

• A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the

current absorption peaks, a 100µF tantalum capacitor is usually suited.

• Make sure the low ESR capacitor (usually a tantalum one) is rated at least 10V.

• A protection diode should be inserted close to the power input, in order to save the

GE910 from power polarity inversion. Otherwise the battery connector should be done in

a way to avoid polarity inversions when connecting the battery.

• The battery capacity must be at least 500mAh in order to withstand the current peaks of

2A; the suggested capacity is from 500mAh to 1000mAh.