User's Manual

LE910 V2 HARDWARE USER GUIDE 1VV0301200 Rev.2 Preliminary • 2015-08-04 6 of 81
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
5.5.3.2 Modem serial port 2 (USIF1) 44
5.5.3.3 RS232 level translation 45
5.6 General Purpose I/O 46
5.6.1 Using a GPIO as INPUT 47
5.6.2 Using a GPIO as OUTPUT 47
5.6.3 Indication of network service availability 47
5.7 External SIM Holder 49
5.8 ADC Converter 49
6 RF Section 50
6.1 Bands Variants 50
6.2 TX Output Power 50
6.3 RX Sensitivity 51
6.4 Antenna Requirements 53
6.4.1 PCB design guidelines 56
6.4.2 PCB Guidelines in case of FCC Certification 57
6.4.2.1 Transmission line design 57
6.4.2.2 Transmission Line Measurements 58
6.4.2.3 Antenna Installation Guidelines 60
7 Audio Section Overview 64
7.1 Electrical Characteristics 64
7.2 Codec examples 64
8 Mechanical Design 65
8.1 Drawing 65
9 Application PCB Design 66
9.1 Footprint 66
9.2 PCB pad design 67
9.3 PCB pad dimensions 67
9.4 Stencil 69
9.5 Solder paste 69
9.6 Solder reflow 69
10 Packaging 71
10.1 Tray 71
10.2 Reel 73
10.2.1 Carrier Tape detail 73
10.2.2 Reel detail 74
10.2.3 Packaging detail 75
10.3 Moisture sensitivity 75