Technical information

Configuration
20 G24/H24 - Developer’s Kit August 31, 2009
Microphone
The microphone connector (J460) is labeled MIC. The Microphone Connector pinout (J460) is
shown in Table 2-8.
Audio Source Selection
The microphone and speaker audio can be routed through two different sources, the G24/H24
audio amplifiers or the G24/H24 digital audio interface. The Developer Board includes an on
board CODEC that converts the G24/H24 digital audio data to analog audio signals.
AUDIO switch of S140 (see Figure 2-17, on page 27), selects the speaker and microphone
source, as indicated in Table 2-9. This enables you to test the digital or analog audio channels.
Headset
The headset interface is designed as a portable phone audio interface, and is similar to a phone
headset interface. The headset connector (J440), labeled HEADSET, includes a speaker,
microphone and a detection signal. The speaker and microphone signals are directly connected to
the G24/H24 audio signals.
The Headset Connector pinout (J440) is shown in Table 2-10.
Table 2-8: Microphone Connector Pinout (J460)
Pin # Description
1 Ground
2 Not connected
3 Not connected
4 Microphone audio-in
5 Not connected
6 Grounding switch
Table 2-9: Audio Source Selection (S140-"AUDIO")
Reference Description "Off" State "On" State
Audio Selecting between Analog or
Digital Audio.
Analog audio - audio sources are
the G24/H24 audio lines.
Digital audio - audio
source is the on board
CODEC.
Table 2-10: Headset Connector Pinout (J440)
Pin # Description
1 Ground
2 Headset-detect switch
3 Speaker audio-out