Microphone; Audio Source Selection; Headset - Motorola G24-L Technical Information

Microphone

The microphone connector (J460) is labeled MIC. The Microphone Connector pinout (J460) is
shown in

Audio Source Selection

The microphone and speaker audio can be routed through two different sources, the G24-L audio
amplifiers or the G24-L digital audio interface. The Developer Board includes an on board
CODEC that converts the G24-L digital audio data to analog audio signals.
AUDIO switch of S140 (see
source, as indicated in
Reference
Audio Selecting between Analog or
Digital Audio.

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-L audio signals.
The Headset Connector pinout (J440) is shown in
September 25, 2007
Table 2-7.
Table 2-7: Microphone Connector Pinout (J460)
Pin #
1
2
3
4
5
6
Figure 2-16, on page
Table 2-8. This enables you to test the digital or analog audio channels.
Table 2-8: Audio Source Selection (S140-"AUDIO")
Description
Analog audio - audio sources are
the G24-L audio lines.
Table 2-9: Headset Connector Pinout (J440)
Pin #
1
2
3
G24-L Developer's Kit
Chapter 2: Developer Board and Interfaces Description
Description
Ground
Not connected
Not connected
Microphone audio-in
Not connected
Grounding switch
26), selects the speaker and microphone
"Off" State
Table 2-9.
Description
Ground
Headset-detect switch
Speaker audio-out
"On" State
Digital audio - audio
source is the on board
CODEC.
19