WM8533 datasheet(19/41 Pages) WOLFSON

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Production Data

WM8533

PD, July 2012, Rev 4.0

DIGITAL AUDIO INTERFACE

The digital audio interface is used for inputting audio data to the WM8533. The digital audio interface

uses three pins:



DACDAT: DAC data input



LRCLK: Left/Right data alignment clock



BCLK: Bit clock, for synchronisation

MASTER AND SLAVE MODE OPERATION

The WM8533 digital audio interface can operate as a master or as a slave as shown in Figure 13 and

Figure 14.

Figure 13 Slave Mode

Figure 14 Master Mode

INTERFACE FORMATS

The WM8533 supports five different audio data formats:



Left justified



Right justified



I2S



DSP Mode A



DSP Mode B

PCM operation is supported using the DSP mode. All of these modes are MSB first. They are

described in the following sections. Refer to the “Signal Timing Requirements” section for timing

information. Refer to Table 10 for interface control format register settings.

AUDIO DATA FORMATS

In Right Justified mode, the LSB is available on the last rising edge of BCLK before a LRCLK

transition. All other bits are transmitted before (MSB first). Depending on word length, BCLK

frequency and sample rate, there may be unused BCLK cycles after each LRCLK transition.

Figure 15 Right Justified Audio Interface (assuming n-bit word length)

WM8533 Datasheet(PDF) 19 Page - Wolfson Microelectronics plc