HE920 Hardware User Guide
1vv0301014 Rev.9 – 2014-01-23
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
Reserved.
Page 5 of 84
Contents
1.
Introduction ................................................. 9
1.1.
Scope ..................................................... 9
1.2.
Audience .................................................. 9
1.3.
Contact Information, Support .............................. 9
1.4.
Document Organization .................................... 10
1.5.
Text Conventions ......................................... 11
1.6.
Related Documents ........................................ 11
2.
General Product Description ................................. 12
2.1.
Overview ................................................. 12
2.2.
HE920 Mechanical Dimensions .............................. 13
2.3.
Weight ................................................... 13
2.4.
Environmental requirements ............................... 14
2.4.1.
Temperature range .......................................... 14
2.4.2.
RoHS compliance ............................................ 14
2.5.
Operating Frequency ...................................... 14
3.
HE920 Module Connections .................................... 16
3.1.
PIN-OUT .................................................. 16
3.1.1.
LGA Pads Layout ............................................ 23
4.
Hardware Commands ........................................... 25
4.1.
Turning ON the HE920 ..................................... 25
4.2.
Initialization and Activation state ...................... 25
4.3.
Turning OFF the HE920 .................................... 27
4.3.1.
Shutdown by Software Command ............................... 28
4.3.2.
Hardware Shutdown .......................................... 29
4.4.
Hardware Unconditional Restart (RESET) ................... 30
4.5.
Hardware Unconditional Shutdown (Power Off) .............. 31
4.6.
Summary of Turning ON and OFF the module ................. 32
5.
Power Supply ................................................ 33
5.1.
Power Supply Requirements ................................ 33
5.2.
General Design Rules ..................................... 35
