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Developer Board and Interfaces Description
3.4.3.4
Headset
The headset interface is designed as a portable phone audio interface, and is similar to a phone headset interface. The headset
connector (J440) includes a speaker, microphone and a detection signal. The speaker and microphone signals are directly
connected to the g20 audio signals.
The purpose of the detection circuit is to switch the g20 headset audio paths on and off, whenever a headset connection is
detected. Headset detection is made whenever a headset plug is inserted into the jack. This action disables the g20 microphone
and speaker, and routes the audio signals to the headset.
3.4.3.5
Alert Transducer
The Developer Board includes an on-board transducer, labeled ALERT, for alert audio sounds (LS400). The transducer is
connected directly to the g20 differential alert outputs. The alert transducer sounds the g20 MIDI signals.
22
Table 16. Headset Connector Pinout (J440)
Pin #
Description
1
Ground
2
Headset-detect switch
3
Speaker audio-out
4
Microphone audio-in
5
Ground
Table 17. Alert Transducer Pinout (LS400)
Pin #
Description
1
Alert audio inverted output
2
Alert audio positive output
3
Alert audio inverted output
4
Alert audio inverted output
98-08901C67-O
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