User's Manual

LE910 V2 HARDWARE USER GUIDE 1VV0301200 Rev.2 Preliminary • 2015-08-04 5 of 81
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 20
4 Power Supply 21
4.1 Power Supply Requirements 21
4.2 Power Consumption 22
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 Communication ports 41
5.5.1 USB 2.0 HS 41
5.5.2 SPI 42
5.5.2.1 SPI Connections 42
5.5.3 Serial Ports 43
5.5.3.1 Modem serial port 1 (USIF0) 43