User's Manual

GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 1 - 24/10/06
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 2 of 70
Contents
1 Overview ...........................................................................................................................6
2 Interface connectors on GM862-QUAD / PY ..................................................................7
2.1 Description..............................................................................................................................7
2.2 Connectors Position ..............................................................................................................7
2.3 Board to Board Connector ....................................................................................................8
2.3.1 Molex 52991-0508 (male) GM862 Connector PIN-OUT ..................................................................9
2.3.2 Antenna Connector........................................................................................................................ 11
2.4 Dimensions ...........................................................................................................................12
2.5 Mounting the GM862 Modules on your Board ...................................................................13
2.5.1 Antenna Coaxial Cable Fixing ....................................................................................................... 13
2.5.2 Precautions.................................................................................................................................... 15
3 Hardware Commands ....................................................................................................16
3.1 Turning ON the GM862-QUAD / PY .....................................................................................16
3.2 Turning OFF the GM862-QUAD / PY ...................................................................................18
3.2.1 Hardware Shutdown ...................................................................................................................... 18
3.2.2 Hardware Unconditional Restart.................................................................................................... 19
4 Power Supply .................................................................................................................21
4.1 Power Supply Requirements...............................................................................................21
4.2 General Design Rules ..........................................................................................................22
4.2.1 Electrical Design Guidelines .......................................................................................................... 22
4.2.1.1 + 5V input Source Power Supply Design Guidelines ................................................................ 22
4.2.1.2 + 12V input Source Power Supply Design Guidelines .............................................................. 24
4.2.1.3 Battery Source Power Supply Design Guidelines ..................................................................... 26
4.2.1.4 Battery Charge control Circuitry Design Guidelines .................................................................. 26
4.2.2 Thermal Design Guidelines ........................................................................................................... 29
4.2.3 Power Supply PCB layout Guidelines ........................................................................................... 30
5 Serial Ports .....................................................................................................................31
5.1 Level translation ...................................................................................................................33
5.2 5V UART level translation....................................................................................................35
6 Audio Section Overview ................................................................................................37
6.1 Microphone Paths Characteristic and Requirements .......................................................39
6.2 General Design Rules ..........................................................................................................42
6.3 Other Considerations...........................................................................................................42