Datasheet

Functional description STA333ML
10/21 Doc ID 13177 Rev 6
4 Functional description
4.1 Serial audio interface protocols
The STA333ML serial audio input interfaces with standard digital audio components and
accepts serial data formats. The STA333ML always acts as a slave when receiving audio
input from standard digital audio components. Serial data for two channels is provided using
3 input pins: left/right clock LRCKI (pin 29), serial clock BICKI (pin 28), and serial data SDI
(pin 30).
The available formats are given in Figure 6 and Figure 7. Pin FMT (pin 2) selects the format
such that FMT = logical 0 gives the I
2
S format and FMT = logical 1 gives the left-justified.
Figure 6. I
2
S
Figure 7. Left-justified
1
n
n
-1
2
3
Bicki
Sdi
Lrclki
n
n
-1
n
n
-1
3
21
3
21
1
n
n
-1
n
n
-1
2
3
1
2
3
Sdatai/
Sdatao
Biclki/
Biclko
Lrclki/
Lrclko