User's Guide

LE866 HARDWARE USER GUIDE 1vv0301210 Rev.0 Preliminary 2015-09-02 5 of 68
Reproduction forbidden without Telit Communications PLC written authorization All Rights Reserved
CONTENTS
1 Introduction 8
Scope 8
Audience 8
Contact Information, Support 8
List of acronyms 9
Text Conventions 10
1.6. Related Documents 10
2 Overview 11
3 Pins Allocation 12
Pin-out 12
LGA Pads Layout 17
4 Power Supply 18
Power Supply Requirements 18
Power Consumption 19
General Design Rules 20
Electrical Design Guidelines 20
4.3.1.1 +5V Source Power Supply Design Guidelines 20
4.3.1.2 + 12V input Source Power Supply Design Guidelines 21
4.3.1.3 Battery Source Power Supply Design Guidelines 22
4.3.1.4 Thermal Design Guidelines 23
4.3.1.5 Power Supply PCB layout Guidelines 24
RTC 25
VAUX Power Output 25
5 Digital Section 26
Logic Levels Specification 26
Power on 27
Power off 29
Reset 30
Communication ports 33
USB 2.0 HS 33
Serial Ports 34
5.5.2.1 MODEM SERIAL PORT 1 (USIF0) 34
5.5.2.2 MODEM SERIAL PORT 2 (USIF1) 36
5.5.2.3 RS232 LEVEL TRANSLATION 36