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GE864 Hardware User Guide
1vv0300694 Rev.10 - 10/06/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 3 of 69
Contents
1 Overview ...........................................................................................................................7
2 GE864 Mechanical Dimensions ......................................................................................8
3 GE864 module connections ............................................................................................9
3.1 PIN-OUT...................................................................................................................................9
3.1.1 BGA Balls Layout........................................................................................................................... 13
4 Hardware Commands ....................................................................................................15
4.1 Turning ON the GE864-QUAD / PY......................................................................................15
4.2 Turning OFF the GE86
4-QUAD / PY....................................................................................17
4.2.1 Hardware shutdown....................................................................................................................... 17
4.2.2 Hardware Unconditional Restart.................................................................................................... 17
5 Power Supply .................................................................................................................19
5.1 Power Supply Requirements...............................................................................................19
5.2 General Design Rules
..........................................................................................................20
5.2.1 Electrical Design Guidelines.......................................................................................................... 20
5.2.1.1 + 5V input Source Power Supply Design Guidelines ................................................................ 20
5.2.1.2 + 12V input Source Power Supply Design Guidelines .............................................................. 21
5.2.1.3 Battery Source Power Supply Design Guidelines ..................................................................... 23
5.2.1.4 Battery Charge control Circuitry Design Guidelines .................................................................. 24
5.2.2 Thermal Design Guidelines ........................................................................................................... 26
5.2.3 Power Supply PCB layout Guidelines ........................................................................................... 27
6 Antenna...........................................................................................................................28
6.1 GSM Antenna Requirements ...............................................................................................28
6.2 GSM Antenna – PCB li
ne Guidelines..................................................................................29
6.3 GSM Anten
na – Installation Guidelines
..............................................................................30
7 Logic level specifications..............................................................................................31
7.1 Reset signal ..........................................................................................................................32
8 Serial Ports .....................................................................................................................33
8.1 MODEM SERIAL PORT.........................................................................................................33
8.2 RS232 level translation ........................................................................................................35
8.3 5V UART le
vel translation
....................................................................................................37
9 Audio Section Overview ................................................................................................39
9.1 INPUT LINES (Microphone) .................................................................................................40
9.1.1 Short description............................................................................................................................ 40
9.1.2 Input Lines Characteristics ............................................................................................................ 41