WM8962B datasheet(111/295 Pages) WOLFSON

111 / 295 page

WM8962

Rev 4.3

111

DAC AUTO-MUTE

The DAC digital mute and volume controls are described earlier in Table 61 and Table 63.

The

DAC

also

incorporates

digital

auto-mute

monitor,

which

enabled

setting

DAC_AUTOMUTE. When the auto-mute is enabled, and a number (DAC_AUTOMUTE_SAMPLES) of

consecutive zero-samples is detected, the AUTOMUTE_STS flag is asserted.

The WM8962 supports the option to automatically power-down the speaker path when the DAC Auto-

Mute is triggered, and to re-enable the speaker path when audio data is detected. This feature has

been designed to work around the Write Sequencer, which mutes and unmutes the speakers in a

controlled manner using the Speaker Sleep (see Table 129) and Speaker Wake (see Table 130) write

sequences. Auto-mute is enabled by setting the WSEQ_AUTOSEQ_ENA bit in Register R87. See

Table 64 for details of this and other Auto-mute register bits.

The status of DAC Auto-Mute can be read back from the AUTOMUTE_STS bit.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R9 (09h)

Audio

Interface 0

AUTOMUTE_STS

Readback of the DAC Automute

status

0 = Automute not detected

1 = Automute detected

9:8

DAC_AUTOMUT

E_SAMPLES [1:0]

Selects the number of consecutive

zero DAC samples that will be

interpreted as an Automute.

00 = 128 samples

01 = 256 samples

10 = 512 samples

11 = 1024 samples

DAC_AUTOMUT

DAC Auto-Mute Control

0 = Disabled

1 = Enabled

R87 (57h)

Write

Sequencer

Control 1

WSEQ_AUTOSE

Q_ENA

Write Sequencer Auto-Sequence

Enable (controls the Class D driver

via DAC Auto-Mute function)

0 = Disabled

1 = Enabled

Table 64 DAC Auto Mute

DAC MONO MIX

A DAC digital mono-mix mode can be enabled using the DAC_MONOMIX register bit. This mono mix

will be output on whichever DAC is enabled. To prevent clipping, a -6dB attenuation is automatically

applied to the mono mix.

The mono mix is only supported when one or other DAC is disabled. When the mono mix is selected,

then the mono mix is output on the enabled DAC only; there is no output from the disabled DAC. If

DACL_ENA and DACR_ENA are both set, then stereo operation applies.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R57(39h)

DAC DSP Mixing

(1)

DAC_MONOMIX

DAC Mono Mix

0 = Stereo

1 = Mono (Mono mix output on

enabled DAC)

Mono Mix is only supported

when one or other DAC is

disabled.

When Mono mix is enabled,

6dB attenuation is applied.

Table 65 DAC Mono Mix

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