User's Manual

GE/GC864-QUAD V2 and GE864-GPS Hardware User Guide
1vv0300915 Rev.2 – 2011-06-15
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights
Reserved. Page 42 of 97
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
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 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.
6.3.2. Thermal Design Guidelines
The thermal design for the power supply heat sink must be done
with the following specifications:
• Average current consumption during transmission @PWR
level max: 500mA
• Average current consumption during transmission @ PWR
level min: 100mA
• Average current during Power Saving (CFUN=5): from 1.5 to
3.9mA
• Average current during idle (Power Saving disabled): 16mA
NOTE:
The average consumption during transmissions depends on the
power level at which the device is requested to transmit by
the network. The average current consumption hence varies
significantly.