DocID025317 Rev 2

11/17

STA333SML

Electrical specifications

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3.8

Serial audio interface description

3.8.1

Serial audio interface protocols

The STA333SML serial audio input was designed to interface with standard digital audio

components and to accept I²S formats. The STA333SML 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 B4), serial clock BICKI (pin C4),

and serial data SDI (pin A5).

The available formats are shown in Figure 6, Figure 7 and Figure 8.

Figure 6. I²S -16 fs

Figure 7. I²S - 24fs

Figure 8. I²S - 32fs

LRCKI

Left Channel

Right Channel

16 Clks

16 Clks

BICKI

14

8

0

14

8

SDI

0

LRCKI

Left Channel

Right Channel

24 Clks

24 Clks

BICKI

22

11

0

19

15

0

7

0

22

11

SDI

0

19

15

0

11

0

LRCKI

Left Channel

Right Channel

32 Clks

32 Clks

BICKI

23

8

0

19

15

0

4

0

23

8

19

15

0

4

0

SDI

0