Rainbow Electronics GM862-QUAD-PY - 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