WM8945ECSSLASHR datasheet(66/169 Pages) WOLFSON

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WM8945

Production Data

PD, May 2011, Rev 4.1

AUDIO DATA FORMATS

Three basic audio data formats are supported:



Left justified



DSP mode

All four of these modes are MSB first. They are described in Audio Data Formats, below. Refer to the

Electrical Characteristic section for timing information.

PCM operation is supported using the DSP mode.

The WM8945 is a mono device. By default, the WM8945 transmits ADCs data on the Left channel

only of the Digital Audio Interface, and receives DAC data on the Left channel. The ADC transmit

configuration can be set using the ADCR_SRC and ADCL_SRC bits; the DAC receive channel can

be selected using the DACL_SRC bit. Digital inversion of the ADC and DAC data is also possible.

The register bits controlling audio data format and channel configuration are described in Table 44.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R4 (04h)

Audio

Interface

ADCR_SRC

Right Digital Audio interface source

0 = Left ADC data is output on right

channel

1 = No data is output on right

channel

ADCL_SRC

Left Digital Audio interface source

0 = Left ADC data is output on left

channel

1 = No data is output on left channel

DACL_SRC

Left DAC Data Source Select

0 = Left DAC outputs left interface

data

1 = Left DAC outputs right interface

data

BCLK_INV

BCLK Invert

0 = BCLK not inverted

1 = BCLK inverted

LRCLK_INV

LRCLK Polarity / DSP Mode A-B

select.

Right, left and I

2S modes – LRCLK

polarity

0 = Not Inverted

1 = Inverted

DSP Mode – Mode A-B select

0 = MSB is available on 2

nd BCLK

rising edge after LRCLK rising edge

(mode A)

1 = MSB is available on 1

st BCLK

rising edge after LRCLK rising edge

(mode B)

3:2

WL [1:0]

Digital Audio Interface Word Length

00 = 16 bits

01 = 20 bits

10 = 24 bits

11 = 32 bits

Note – see “Companding” for the

selection of 8-bit mode.

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