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User's Guide

ManualsBrandsTelit Communications ManualsElectronicsGSM 850, E-GSM 900, DCS 1800, PCS 1900, FDD IV, 2G/3.5G module
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UC864-E-AUTO / AWS-AUTO Hardware User Guide
1vv0300795 Rev.11 – 2010/11/18
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights Reserved. Page 26 of 78
• Make sure the low ESR capacitor on the power supply output (usually a
tantalum one) is rated at least 10V.
• For Car applications a spike protection diode must be inserted close to
the power input, in order to clean the supply from spikes.
• A protection diode must be inserted close to the power input, in order to
save UC864-E-AUTO / AWS-AUTO from power polarity inversion. This can
be the same diode as for spike protection.
An example of switching regulator with 12V input is in the below schematic (it is split
in 2 parts):