User's Guide
LE866 HARDWARE USER GUIDE 1vv0301210 Rev.0 – Preliminary • 2015-09-02 6 of 68
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
General Purpose I/O 38
Using a GPIO as INPUT 39
Using a GPIO as OUTPUT 39
Indication of network service availability 39
SIMIN Detection 40
External SIM Holder 41
ADC Converter 42
DAC Converter 43
Enabling DAC 43
LOW Pass filter Example 44
6 RF Section 45
Bands Variants 45
TX Output Power 45
RX Sensitivity 45
Antenna Requirements 46
Main Antenna 46
RX Diversity Antenna 47
PCB design guidelines 47
PCB Guidelines in case of FCC Certification 49
6.4.4.1 Transmission line design 49
6.4.4.2 Transmission Line Measurements 50
6.4.4.3 Antenna Installation Guidelines 51
7 Audio Section 52
Overview 52
Digital Voice Interface 52
CODEC Examples 52
8 Mechanical Design 53
Drawing 53
9 Application Design 54
Footprint 54
PCB pad design 55
PCB pad dimensions 55
Stencil 57
Solder paste 57
Solder reflow 57
10 Packaging 59
Tray 59