Hardware Manual
Table Of Contents
- WE865-DUAL Hardware User Guide
- Contents
- 1 Overview
- 2 Mechanical description
- 3 Pin-out
- 4 Electrical description
- 5 Thermal design guidelines
- 6 PCB layout design guidelines
- 7 Antenna
- 8 Integration with the GE863-PRO3
- 9 WE865-DUAL - Evaluation kit
- 10 Mounting the WE865-DUAL on the application board
- 11 Moisture sensitivity
- 12 Conformity assessment issues
- 13 Safety recommendations
- 14 Document change log
WE865-DUAL HW User Guide
1vv0300787 Rev. 1 - 03/10/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 17 of 48
4.2.1 +5V input source
A linear regulator can be used to generate the 3.8V output voltage. When using a linear regulator, a
proper heat sink shall be provided in order to dissipate the generated power. A protection diode should
be inserted close to the power input, in order to save the WE865-DUAL from power polarity inversion.
This can be the same diode as for spike protection.
The figure below shows a possible solution for the switching power supply. It must be taken into
account that the power supply performance strongly depends on the layout design.
Figure 5