WM8522
Production Data
DMUTE AND MUTEALL
Most simply, the WM8522 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
0001001
BIT
LABEL
DMUTE
[2:0]
DEFAULT
DESCRIPTION
5:3
000
DAC Soft Mute Select
DAC Mute
DMUTE [2:0]
000
DAC CHANNEL 1
Not MUTE
MUTE
DAC CHANNEL 2
DAC CHANNEL 3
Not MUTE
Not MUTE
Not MUTE
Not MUTE
MUTE
Not MUTE
Not MUTE
MUTE
001
010
Not MUTE
MUTE
011
MUTE
100
Not MUTE
MUTE
Not MUTE
Not MUTE
MUTE
101
MUTE
110
Not MUTE
MUTE
MUTE
111
MUTE
MUTE
Table 10 DAC Mute Control
An overall MUTE to all channels can be applied by using the MUTEALL register.
REGISTER ADDRESS
0000010
BIT
LABEL
DEFAULT
DESCRIPTION
Soft Mute Select:
0
MUTEALL
0
DAC Mute
0 : Normal operation
1: Soft mute all channels
MUTE PIN AS INPUT
The WM8522 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
0
0
0
1
1
1
1
00
01
10
11
00
01
10
11
All Channels
CH1
CH2
CH3
All Channels
All Channels
All Channels
All Channels
Table 11 Mute Pin Decode when Mute Pin as Input
PD Rev 4.0 July 2006
24
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
