WM8352 datasheet(91/336 Pages) WOLFSON

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Production Data

WM8352

PD, February 2011, Rev 4.4

13.10 DIGITAL AUDIO INTERFACE

The audio interface enables the WM8352 to exchange audio data with other system components. It

is separate from the control interface and has four dedicated pins:



ADCDAT: Output pin for data coming from the audio ADC



DACDAT: Input pin for audio data going to the audio DAC



LRCLK: Data Left/Right alignment clock (also known as “word clock”)



BCLK: Bit clock, for synchronisation

The LRCLK and BCLK pins are outputs when the WM8352 operates as a master device and are

inputs when it is a slave device.

In order to allow the ADC and DAC to run at different sampling rates, separate ADCLRCLK and

ADCBCLK signals are both available through GPIO pins: GPIO5 (ADCLRCLK) and GPIO6 or GPIO8

(ADCBCLK). This feature also allows mixed Master/Slave operation between the ADC and DAC.

13.10.1 AUDIO DATA FORMATS

The audio interface supports six different audio data formats:



Left justified



Right justified



I2S



DSP mode A



DSP mode B



TDM Mode

In all of these formats, the MSB (most significant bit) of each data sample is transferred first and the

LSB (least significant bit) last.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R112 (70h)

Audio

Interface

AIF_BCLK_INV

BCLK polarity

0 = normal

1 = inverted

AIF_TRI

Sets Output enables for LRCLK and

BCLK and ADCDAT to inactive state

0 = normal

1 = forces pins to Hi-Z

AIF_LRCLK_IN

LRCLK clock polarity

0 = normal

1 = inverted

DSP Mode – mode A/B select

0 = MSB is available on 2nd BCLK rising

edge after LRCLK rising edge (mode A)

1 = MSB is available on 1st BCLK rising

edge after LRCLK rising edge (mode B)

11:10

AIF_WL [1:0]

(24 bits)

Data word length

11 = 32 bits

10 = 24 bits

01 = 20 bits

00 = 16 bits

Note: When using the Right-Justified

data format (AIF_FMT=00), the

maximum word length is 24 bits.

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