User's Manual

Telit GE863-QUAD / GE863-PY
Hardware User guide
1vv0300715, Rev. ISSUE#0, - 21/02/06
Reproduction forbidden without Telit Communication written authorization – All Right reserved – Right of modification reserved page 3 of 71
6 MICROPHONE 27
6.1 Microphone line Characteristic and requirements 27
6.2 General Design Rules 30
6.3 Microphone Biasing 30
6.3.1 Balanced Microphone biasing 31
6.3.2 Unbalanced Microphone biasing 33
6.4 Microphone buffering 34
6.4.1 Buffered Balanced Mic. 34
6.4.2 Buffered Unbalanced (Single Ended) Mic. 37
7 SPEAKER 40
7.1 Speaker lines characteristics and requirements 40
7.2 General Design rules 42
7.2.1 Noise Filtering 43
7.3 Handset earphone design 43
7.4 Hands Free earphone (low power) design 45
7.5 Car Kit speakerphone design 45
8 GENERAL PURPOSE I/O 47
8.1 Using a GPIO pad as INPUT 47
8.2 Using a GPIO pad as OUTPUT 47
8.3 Using the Alarm Output GPIO6 48
8.4 Using the Buzzer Output GPIO7 48
9 CAMERA 49
9.1 Transchip Camera 49
9.1.1 Camera interface connectors 49
9.1.2 EVB for Transchip camera support 52
9.1.3 Block Diagram for supported cameras 53
9.1.4 Schematic Diagrams for supported cameras 54
9.1.5 Example usage script for camera 55