Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 36 of 93
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 UE910 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 UE910 and damage it.
NOTE:
DON'T USE any Ni-Cd, Ni-MH, and Pb battery types directly connected with UE910. Their use
can lead to overvoltage on the UE910 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 UE910 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.
To Next Page
Loading...
Need help?
General
