WM8766

Production Data

w

PD Rev 4.1 July 2005

24

DMUTE AND MUTEALL

Most simply, the WM8766 can be directly muted using the DMUTE register bit to control which

channels are muted. The mute happens as soon as the serial write is performed.

REGISTER ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

0001001

DAC Mute

5:3

DMUTE

[2:0]

000

DAC Soft Mute Select

Table 10 DAC Mute Control

An overall MUTE to all channels can be applied by using the MUTEALL register.

REGISTER ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

0000010

DAC Mute

0

MUTEALL

0

Soft Mute Select:

0 : Normal operation

1: Soft mute all channels

MUTE PIN AS INPUT

The WM8766 can be muted externally by driving the MUTE pin high. When the MUTE pin is driven

low the device will never automute, although direct mutes can still be applied via the DMUTE or

MUTEALL registers.

The DZFM bits are used to decode the operation of a MUTE pin (decides which channels will be

affected by the logic level present on the MUTE pin). MPD (Mute Pin Decode) is used to enable the

DZFM operation. If MPD is set, the selection made by the DZFM bits will be ignored and all channels

will be muted when the pin is driven high.

Table 11 below describes which channels will be softmuted when the MUTE pin is driven high

depending on the MPD and DZFM bits.

MPD

DZFM [1:0]

CHANNELS MUTED WHEN

MUTE PIN HIGH

0

00

All Channels

0

01

CH1

0

10

CH2

0

11

CH3

1

00

All Channels

1

01

All Channels

1

10

All Channels

1

11

All Channels

Table 11 Mute Pin Decode when Mute Pin as Input

DMUTE [2:0]

DAC CHANNEL 1

DAC CHANNEL 2

DAC CHANNEL 3

000

Not MUTE

Not MUTE

Not MUTE

001

MUTE

Not MUTE

Not MUTE

010

Not MUTE

MUTE

Not MUTE

011

MUTE

MUTE

Not MUTE

100

Not MUTE

Not MUTE

MUTE

101

MUTE

Not MUTE

MUTE

110

Not MUTE

MUTE

MUTE

111

MUTE

MUTE

MUTE