User's Manual

GC864 Hardware User Guide
1vv0300733 Rev. 0 - 12/06/06
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 3 of 68
7.5 Microphone buffering...........................................................................................................37
7.5.1 Buffered Balanced Mic................................................................................................................... 37
7.5.2 Buffered Unbalanced (Single Ended) Microphone . ...................................................................... 39
8 OUTPUT LINES (Speaker)..............................................................................................42
8.1 Short description..................................................................................................................42
8.2 Output lines characteristics . .............................................................................................43
8.3 General Design rules............................................................................................................44
8.3.1 Noise Filtering................................................................................................................................ 44
8.4 Handset earphone design....................................................................................................45
8.5 Hands-free earphone (low power) design ..........................................................................46
8.6 Car Kit speakerphone design..............................................................................................47
9 External SIM Holder .......................................................................................................48
9.1 SIM DESIGN GUIDES............................................................................................................48
10 General Purpose I/O.......................................................................................................50
10.1 Using a GPIO pad as INPUT.............................................................................................50
10.2 Using a GPIO pad as OUTPUT.........................................................................................50
10.3 Using the Alarm Output GPIO_06/ALARM......................................................................51
10.4 Using the Buzzer Output GPIO_07/BUZZER...................................................................51
11 Camera ............................................................................................................................52
11.1 Camera characteristics ....................................................................................................52
11.1.1 Camera interface connectors......................................................................................................... 52
11.1.2............................................................................................................................................................. 53
11.1.3............................................................................................................................................................. 53
11.1.4............................................................................................................................................................. 53
11.1.5 EVB for Transchip camera support ............................................................................................... 54
11.1.6 Example usage script for camera .................................................................................................. 55
12 Conformity Assessment Issues....................................................................................56
13 SAFETY RECOMMANDATIONS.....................................................................................57
14 Document Change Log ..................................................................................................58
Annex A – EVK2 schematics ...............................................................................................59
Annex B - Camera EVB schematics ....................................................................................65