User's Guide

LE910 V2 HARDWARE USER GUIDE 1VV0301200 Rev.8 • 2016-10-07 6 of 84
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
5.6.2.1 SPI Connections 44
5.6.3 Serial Ports 45
5.6.3.1 Modem serial port 1 (USIF0) 45
5.6.3.2 Modem serial port 2 (USIF1) 46
5.6.3.3 RS232 level translation 47
5.7 General Purpose I/O 48
5.7.1 Using a GPIO as INPUT 49
5.7.2 Using a GPIO as OUTPUT 49
5.7.3 Indication of network service availability 49
5.8 External SIM Holder 51
5.9 ADC Converter 51
6 RF Section 52
6.1 Bands Variants 52
6.2 TX Output Power 53
6.3 RX Sensitivity 54
6.4 Antenna Requirements 56
6.4.1 PCB design guidelines 59
6.4.2 PCB Guidelines in case of FCC Certification 60
6.4.2.1 Transmission line design 60
6.4.2.2 Transmission Line Measurements 61
6.4.2.3 Antenna Installation Guidelines 63
6.5 Second Antenna Requirements 64
6.5.1 Single Antenna Operation 66
7 Audio Section Overview 67
7.1 Electrical Characteristics 67
7.2 Codec examples 67
8 Mechanical Design 68
8.1 Drawing 68
9 Application PCB Design 69
9.1 Footprint 69
9.2 PCB pad design 70
9.3 PCB pad dimensions 70
9.4 Stencil 72
9.5 Solder paste 72
9.6 Solder reflow 72
10 Packaging 74
10.1 Tray 74