Rainbow Electronics GM862-QUAD-PY User Manual
Page 2
GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 5 - 20/09/07
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 2 of 68
Contents
1
Overview ........................................................................................................................... 6
2
Dimensions ....................................................................................................................... 7
3
Interface connectors on GM862-QUAD / PY .................................................................. 8
3.1
Description .............................................................................................................................. 8
3.2
Connectors Position .............................................................................................................. 8
3.3
Board to Board Connector .................................................................................................... 9
3.3.1
Molex 52991-0508 (male) GM862 Connector PIN-OUT ................................................................10
3.3.2
Antenna Connector .........................................................................................................................12
4
Antenna ........................................................................................................................... 13
4.1
GSM Antenna Requirements ............................................................................................... 13
4.2
GSM Antenna - Installation Guidelines .............................................................................. 14
4.3
Logic level specifications .................................................................................................... 14
4.3.1
Reset signal ....................................................................................................................................15
5
Hardware Commands .................................................................................................... 16
5.1
Turning ON the GM862-QUAD / PY ..................................................................................... 16
5.2
Turning OFF the GM862-QUAD / PY ................................................................................... 18
5.2.1
Hardware Shutdown .......................................................................................................................18
5.2.2
Hardware Unconditional Restart .....................................................................................................19
6
Power Supply ................................................................................................................. 21
6.1
Power Supply Requirements ............................................................................................... 21
6.2
General Design Rules .......................................................................................................... 22
6.2.1
Electrical Design Guidelines ...........................................................................................................22
6.2.1.1
+ 5V input Source Power Supply Design Guidelines .................................................................22
6.2.1.2
+ 12V input Source Power Supply Design Guidelines ...............................................................24
6.2.1.3
Battery Source Power Supply Design Guidelines ......................................................................26
6.2.1.4
Battery Charge control Circuitry Design Guidelines ...................................................................26
6.2.2
Thermal Design Guidelines ............................................................................................................28
6.2.3
Power Supply PCB layout Guidelines ............................................................................................29
7
Serial Ports ..................................................................................................................... 30
7.1
Level translation ................................................................................................................... 32
7.2
5V UART level translation .................................................................................................... 34
8
Audio Section Overview ................................................................................................ 36