WM8766 Wolfson Microelectronics plc, WM8766 Datasheet - Page 24

• Manufacturer Part Number: WM8766
• Description: 24-bit, 192khz 6-channel Dac
• Manufacturer: Wolfson Microelectronics plc

WM8766
w
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.
An overall MUTE to all channels can be applied by using the MUTEALL register.
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.
Table 10 DAC Mute Control
Table 11 Mute Pin Decode when Mute Pin as Input
REGISTER ADDRESS
REGISTER ADDRESS
DMUTE [2:0]
MPD
0
0
0
0
1
1
1
1
DAC Mute
DAC Mute
0001001
0000010
000
001
010
011
100
101
110
111
DZFM [1:0]
00
01
10
11
00
01
10
11
DAC CHANNEL 1
BIT
5:3
BIT
0
Not MUTE
Not MUTE
Not MUTE
Not MUTE
MUTE
MUTE
MUTE
MUTE
MUTEALL
CHANNELS MUTED WHEN
DMUTE
LABEL
LABEL
[2:0]
MUTE PIN HIGH
All Channels
All Channels
All Channels
All Channels
All Channels
CH1
CH2
CH3
DEFAULT
DEFAULT
000
DAC CHANNEL 2
0
Not MUTE
Not MUTE
Not MUTE
Not MUTE
MUTE
MUTE
MUTE
MUTE
DAC Soft Mute Select
Soft Mute Select:
0 : Normal operation
1: Soft mute all channels
DESCRIPTION
DESCRIPTION
DAC CHANNEL 3
PD Rev 4.1 July 2005
Not MUTE
Not MUTE
Not MUTE
Not MUTE
MUTE
MUTE
MUTE
MUTE
Production Data
24