User's Manual

Telit GE863-QUAD / GE863-PY
Hardware User guide
1vv0300697, Rev. ISSUE#0, - 21/11/05
Reproduction forbidden without Telit Communication written authorization – All Right reserved – Right of modification reserved page 3 of 70
6.2 General Design Rules 29
6.3 Microphone Biasing 29
6.3.1 Balanced Microphone biasing 30
6.3.2 Unbalanced Microphone biasing 31
6.4 Microphone buffering 32
6.4.1 Buffered Balanced Mic. 32
6.4.2 Buffered Unbalanced (Single Ended) Mic. 34
7 SPEAKER 37
7.1 Speaker lines characteristics and requirements 37
7.2 General Design rules 39
7.2.1 Noise Filtering 40
7.3 Handset earphone design 40
7.4 Hands Free earphone (low power) design 42
7.5 Car Kit speakerphone design 42
8 GENERAL PURPOSE I/O 44
8.1 Using a GPIO pad as INPUT 44
8.2 Using a GPIO pad as OUTPUT 44
8.3 Using the Alarm Output GPIO6 45
8.4 Using the Buzzer Output GPIO7 45
9 CAMERA 46
9.1 Agilent Camera 46
9.1.1 Camera interface connectors 46
9.2 Transchip Camera 48
9.2.1 Camera interface connectors 48
9.2.2 EVB for Agilent and Transchip camera support 51
9.2.3 Block Diagram for supported cameras 52
9.2.4 Schematic Diagrams for supported cameras 53
9.2.5 Example usage script for camera 55