GL865-DUAL V3 Hardware User Guide
1vv0301018 Rev.5 – 2013-08-05
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
Page 28 of 76
Mod. 0805 2011-07 Rev.2
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 GL865-DUAL V3 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 GL865-DUAL V3 and damage it.
NOTE:
DON'T USE any Ni-Cd, Ni-MH, and Pb battery types directly connected with GL865-DUAL
V3. Their use can lead to overvoltage on the GL865-DUAL V3 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 t
antalum 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
GL865-DUAL V3 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.