Pre-Production
WM8904
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
DAC Volume Update
REFER TO
DAC Digital
Volume Control
R30 (1Eh)
DAC Digital
Volume Left
8
DAC_VU
0
Writing a 1 to this bit causes left and right DAC volume
to be updated simultaneously
Left DAC Digital Volume
00h = Mute
DAC Digital
Volume Control
7:0
DACL_VOL
[7:0]
1100_0000
01h = -71.625dB
02h = -71.250dB
… (0.375dB steps)
C0h to FFh = 0dB
Register 1Eh DAC Digital Volume Left
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
REFER TO
DAC Volume Update
DAC Digital
Volume Control
R31 (1Fh)
DAC Digital
Volume
8
DAC_VU
0
Writing a 1 to this bit causes left and right DAC volume
to be updated simultaneously
Right
Right DAC Digital Volume
00h = Mute
DAC Digital
Volume Control
7:0
DACR_VOL
[7:0]
1100_0000
01h = -71.625dB
02h = -71.250dB
… (0.375dB steps)
C0h to FFh = 0dB
Register 1Fh DAC Digital Volume Right
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
REFER TO
Left Digital Sidetone Volume
0000 = -36dB
Digital Mixing
R32 (20h)
DAC Digital
0
11:8
ADCL_DAC_S
VOL [3:0]
0000
0001 = -33dB
(… 3dB steps)
1011 = -3dB
11XX = 0dB
Right Digital Sidetone Volume
0000 = -36dB
Digital Mixing
7:4
ADCR_DAC_S
VOL [3:0]
0000
0001 = -33dB
(… 3dB steps)
1011 = -3dB
11XX = 0dB
Left DAC Digital Sidetone Source
00 = No sidetone
01 = Left ADC
Digital Mixing
Digital Mixing
3:2
1:0
ADC_TO_DAC
L [1:0]
00
00
10 = Right ADC
11 = Reserved
Right DAC Digital Sidetone Source
00 = No sidetone
01 = Left ADC
ADC_TO_DAC
R [1:0]
10 = Right ADC
11 = Reserved
Register 20h DAC Digital 0
PP, Rev 3.3, September 2012
149
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
