User's Manual

GE865 Hardware User Guide
1vv0300799 Rev.6 - 04/06/09
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 2 of 58
Contents
1 Overview ........................................................................................................................... 5
2 GE865 Mechanical Dimensions....................................................................................... 6
3 GE865 module connections ............................................................................................ 7
3.1 PIN-OUT ................................................................................................................................ 7
3.1.1 BGA Balls Layout ........................................................................................................................... 10
4 Hardware Commands .................................................................................................... 11
4.1 Turning ON the GE865 ....................................................................................................... 11
4.2 Turning OFF the GE865 ..................................................................................................... 14
4.2.1 Hardware shutdown ....................................................................................................................... 14
4.2.2 Hardware Unconditional Restart .................................................................................................... 15
5 Power Supply.................................................................................................................. 17
5.1 Power Supply Requirements ............................................................................................ 17
5.2 Power Consumption .......................................................................................................... 18
5.3 General Design Rules ........................................................................................................ 19
5.3.1 Electrical Design Guidelines .......................................................................................................... 19
5.3.1.1 + 5V input Source Power Supply Design Guidelines ................................................................ 19
5.3.1.2 + 12V input Source Power Supply Design Guidelines .............................................................. 20
5.3.1.3 Battery Source Power Supply Design Guidelines ..................................................................... 22
5.3.2 Thermal Design Guidelines ........................................................................................................... 23
5.3.3 Power Supply PCB layout Guidelines ........................................................................................... 24
6 Antenna ........................................................................................................................... 25
6.1 GSM Antenna Requirements ............................................................................................. 25
6.2 GSM Antenna - PCB line Guidelines................................................................................. 26
6.3 GSM Antenna - Installation Guidelines ............................................................................ 27
7 Logic level specifications .............................................................................................. 28
7.1 Reset signal ....................................................................................................................... 29
8 Serial Ports ..................................................................................................................... 30
8.1 MODEM SERIAL PORT ...................................................................................................... 30
8.2 RS232 level translation ...................................................................................................... 32
8.3 5V UART level translation ................................................................................................. 35
9 Audio Section Overview ................................................................................................ 37
9.1 Microphone Paths Characteristic and Requirements ..................................................... 37
10 OUTPUT LINES (Speaker) .............................................................................................. 38