User's Guide

LE910 V2 HARDWARE USER GUIDE 1VV0301200 Rev.8 • 2016-10-07 5 of 84
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
CONTENTS
1 Introduction 8
1.1 Scope 8
1.2 Audience 8
1.3 Contact Information, Support 8
1.4 List of acronyms 9
1.5 Text Conventions 11
1.6 Related Documents 11
2 Overview 12
3 Pins Allocation 13
3.1 Pin-out 13
3.2 LGA Pads Layout 19
4 Power Supply 20
4.1 Power Supply Requirements 20
4.2 Power Consumption 21
4.3 General Design Rules 23
4.3.1 Electrical Design Guidelines 23
4.3.1.1 +5V Source Power Supply Design Guidelines 23
4.3.1.3 Battery Source Power Supply Design Guidelines 25
4.3.1.4 Thermal Design Guidelines 26
4.3.1.5 Power Supply PCB layout Guidelines 27
4.4 RTC Bypass out 29
4.5 VAUX Power Output 29
5 Digital Section 30
5.1 Logic Levels 30
5.2 Power on 31
5.3 Power off 36
5.4 Unconditional Shutdown 38
5.5 Fast power down 41
5.5.1 Fast Shut Down by Hardware 41
5.5.2 Fast Shut Down by Software 42
5.6 Communication ports 43
5.6.1 USB 2.0 HS 43
5.6.2 SPI 44