User guide

UC864-E/G/WD/WDU Hardware User Guide
1vv0300766a Rev.4
- 03/02/09
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights Reserved. Page 27 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/G/WD/WDU 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):