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 74 of 78
14.2. ESD Protection for USB interface
The following schematics are recommended for USB interface.
The single TVS diode or varistor can be used on the respective pins.
Additionally Telit recommend that suitable resistors should be used to protect the
USB D+/D- signal from ESD.
14.3. ESD Protection for Power Supplies
Telit recommend that the single TVS diode or varistor should be used to protect
UC864-E/G/WDU from ESD for the following lines.
- Vbatt : Pin 1,2,3,4
- VAUX1 : Pin 50
- CHARGE : Pin 51,52
- ON/OFF: Pin 53
- VRTC : Pin 55