WM8766_05 Datasheet, PDF (24/36 Pages) Wolfson Microelectronics plc – 24-bit, 192kHz 6-Channel DAC

WM8766
Production Data
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
0001001
5:3 DMUTE
DAC Mute
[2:0]
DEFAULT
000
DESCRIPTION
DAC Soft Mute Select
DMUTE [2:0]
000
001
010
011
100
101
110
111
DAC CHANNEL 1
Not MUTE
MUTE
Not MUTE
MUTE
Not MUTE
MUTE
Not MUTE
MUTE
Table 10 DAC Mute Control
DAC CHANNEL 2
Not MUTE
Not MUTE
MUTE
MUTE
Not MUTE
Not MUTE
MUTE
MUTE
DAC CHANNEL 3
Not MUTE
Not MUTE
Not MUTE
Not MUTE
MUTE
MUTE
MUTE
MUTE
An overall MUTE to all channels can be applied by using the MUTEALL register.
REGISTER ADDRESS
0000010
DAC Mute
BIT LABEL
0 MUTEALL
DEFAULT
0
DESCRIPTION
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
0
0
0
0
1
1
1
1
DZFM [1:0]
00
01
10
11
00
01
10
11
CHANNELS MUTED WHEN
MUTE PIN HIGH
All Channels
CH1
CH2
CH3
All Channels
All Channels
All Channels
All Channels
Table 11 Mute Pin Decode when Mute Pin as Input
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PD Rev 4.1 July 2005
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