GE/GC864-QUAD V2 and GE864-GPS Hardware User Guide
1vv0300915 Rev.5 – 2011-10-03
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved.
Page 41 of 94
6.3.1.3.
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 GE/GC864-QUAD V2 AND GE864-GPSmodules.
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 module and damage it.
WARNING:
DON'T USE any Ni-Cd, Ni-MH, and Pb battery types directly connected with GE/GC864-
QUAD V2 and GE864-GPS. Their use can lead to overvoltage on the module 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 100
μ
F 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
module 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.
