User's Guide

HE863 Family Hardware User Guide
1vv0300891 Rev.5
- 2011-03-18
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights
Reserved. Page 42 of 89
 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 HE863 Family 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):
Switching regulator