User's Manual

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.7 • 2015-04-17 6 of 68
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
MODEM SERIAL PORT 2 (USIF1) 37
RS232 LEVEL TRANSLATION 38
5.6 General Purpose I/O 39
Using a GPIO as INPUT 40
Using a GPIO as OUTPUT 40
Indication of network service availability 41
SIMIN Detection 42
5.7 External SIM Holder 42
5.8 ADC Converter 43
5.9 DAC Converter 44
Enabling DAC 44
LOW Pass filter Example 45
6 RF Section 46
6.1 Bands Variants 46
6.2 TX Output Power 46
6.3 RX Sensitivity 46
6.4 Antenna Requirements 47
PCB design guidelines 47
PCB Guidelines in case of FCC Certification 49
Transmission line design 49
Transmission Line Measurements 50
Antenna Installation Guidelines 52
7 Audio Section 53
7.1 Overview 53
7.2 Digital Voice Interface 53
CODEC Examples 53
8 Mechanical Design 54
8.1 Drawing 54
9 Application Design 55
9.1 Footprint 55
9.2 PCB pad design 56
9.3 PCB pad dimensions 56
9.4 Stencil 58
9.5 Solder paste 58
9.6 Solder reflow 58
10 Packaging 60
10.1 Tray 60