User guide

Hardware Description
ARM DUI 0224I Copyright © 2003-2010 ARM Limited. All rights reserved. 3-57
Figure 3-24 Audio interface
Two microphone inputs are present on J4. Only monophonic sound is supported, but
microphone channel CODEC_MIC1 or CODEC_MIC2 can be selected in software.
Solder link LK1 selects passive or active (electret) microphones:
Link AB Active microphone with power on CODEC_MIC1 (tip). Passive
microphone on CODEC_MIC2 (not powered).
This is the default configuration.
Link BC Active microphone with power on CODEC_MIC2 (ring). Passive
microphone on CODEC_MIC1 (not powered).
No link Passive microphone on CODEC_MIC1 and CODEC_MIC2.
The signals associated with the audio CODEC interface are also assigned to connector
J45, the AACI expansion socket pins, as shown in Table 3-13 on page 3-58.
Note
The AACI expansion connector J45 is not fitted to the PB926EJ-S.