User's Manual

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.7 • 2015-04-17 5 of 68
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 16
4 Power Supply 17
4.1 Power Supply Requirements 17
4.2 Power Consumption 18
4.3 General Design Rules 19
Electrical Design Guidelines 19
+5V Source Power Supply Design Guidelines 19
+ 12V input Source Power Supply Design Guidelines 20
Battery Source Power Supply Design Guidelines 21
Thermal Design Guidelines 22
Power Supply PCB layout Guidelines 23
4.4 RTC Bypass out 24
4.5 VAUX Power Output 24
5 Digital Section 25
5.1 Logic Levels Specification 25
5.2 Power on 26
5.3 Power off 29
5.4 Reset 30
5.5 Communication ports 33
USB 2.0 HS 33
SPI 34
SPI Connections 34
Serial Ports 35
MODEM SERIAL PORT 1 (USIF0) 35