Pre-Production
WM8904
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R57 (39h)
Left Headphone Output Mute
0 = Un-mute
8
HPOUTL_MUTE
0
Analogue
OUT1 Left
1 = Mute
Headphone Output Volume Update
7
6
HPOUT_VU
HPOUTLZC
0
0
Writing a 1 to this bit will update
HPOUTL and HPOUTR volumes
simultaneously.
Left Headphone Output Zero Cross
Enable
0 = disabled
1 = enabled
Left Headphone Output Volume
000000 = -57dB
5:0
HPOUTL_VOL
[5:0]
10_1101
000001 = -56dB
(… 1dB steps)
111001 = 0dB
(… 1dB steps)
111110 = +5dB
111111 = +6dB
R58 (3Ah)
Right Headphone Output Mute
0 = Un-mute
8
7
HPOUTR_MUTE
HPOUT_VU
0
0
Analogue
OUT1 Right
1 = Mute
Headphone Output Volume Update
Writing a 1 to this bit will update
HPOUTL and HPOUTR volumes
simultaneously.
Right Headphone Output Zero Cross
Enable
6
HPOUTRZC
0
0 = disabled
1 = enabled
Right Headphone Output Volume
000000 = -57dB
000001 = -56dB
(… 1dB steps)
5:0
HPOUTR_VOL
[5:0]
10_1101
111001 = 0dB
(… 1dB steps)
111110 = +5dB
111111 = +6dB
Table 45 Volume Control for HPOUTL and HPOUTR
PP, Rev 3.3, September 2012
77
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
