DocID13177 Rev 8

11/23

STA333ML

Functional description

23

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 I2S format and FMT = logical 1 gives the left-justified.

Figure 6. I2S

Figure 7. Left-justified

1

n

n-1

2 3

Bicki

Sdi

Lrclki

n

n-1

n

n-1

3

2

1

3

2

1

1

n

n-1

n

n-1

2 3

1

2 3

Sdatai/

Sdatao

Biclki/

Biclko

Lrclki/

Lrclko