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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 69
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
54
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