User Manual

Stereo Module

2015 Microchip Technology Inc.
Page 15
P
reliminary
Edition
2.2 I
2
S Signal Application for BM23
BM23 support I
2
S digital audio signal interface to connect your external CODEC/DSP. It provide 8k
Hz, 44.1k Hz and 48k Hz sampling rate; it also support 16 bits and 24bits data format. The I
2
S setting
can be set up by UI and DSP tools.
.
The external CODEC/DSP needs to be connected to SLK0, RFS0, TFS0, DR0, and DT0 (pins 4, 2, 3,
5, and 6 respectively). The I
2
S signal connection between BM23 and external DSP as below:
FIGURE 2-9: MASTER MODE REFERENCE CONNECTION
FIGURE 2-10: SLAVE MODE REFERENCE CONNECTION
Note 1: For 002 version chip or module, system should connect line 1 in slave mode figure.
And, system not support ADC signal from external DSP/CODEC.
Note 2: For other version chip or module, system should connect line 2 in slave mode figure.
About “Mast” or “Slave” mode setting, you can use “DSP Configuration Tool” to set up system.