User's Manual

UE910 3G HARDWARE USER GUIDE 1vv0301171 Rev.3 • 2015-04-17 5 of 78
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 10
1.6. Related Documents 10
2 Overview 11
3 Pins Allocation 12
3.1 Pin-out 12
LGA Pads Layout 19
4 Power Supply 20
4.1 Power Supply Requirements 20
4.2 Power Consumption 21
4.3 General Design Rules 22
Electrical Design Guidelines 22
+5V Source Power Supply Design Guidelines 22
+ 12V input Source Power Supply Design Guidelines 23
Battery Source Power Supply Design Guidelines 24
Thermal Design Guidelines 25
Power Supply PCB layout Guidelines 26
4.4 RTC Bypass out 27
4.5 VAUX Power Output 27
5 Digital Section 28
5.1 Logic Levels Specification 28
5.2 Power on 29
5.3 Power off 34
5.4 Unconditional Shutdown 36
5.5 Communication ports 39
USB 2.0 HS 39
USB HSIC 40
SPI 41
SPI Connections 41
Serial Ports 42