WM8904
Pre-Production
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
Left Headphone Output Mute
REFER TO
Output Volume
Control
R57 (39h)
Analogue
OUT1 Left
8
HPOUTL_MUT
E
0
0 = Un-mute
1 = Mute
Headphone Output Volume Update
Output Volume
Control
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
Output Volume
Control
1 = enabled
Left Headphone Output Volume
000000 = -57dB
Output Volume
Control
5:0
HPOUTL_VOL
[5:0]
10_1101
000001 = -56dB
(… 1dB steps)
111001 = 0dB
(… 1dB steps)
111110 = +5dB
111111 = +6dB
Register 39h Analogue OUT1 Left
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
REFER TO
Right Headphone Output Mute
0 = Un-mute
Output Volume
Control
R58 (3Ah)
Analogue
OUT1 Right
8
HPOUTR_MUT
E
0
1 = Mute
Headphone Output Volume Update
Output Volume
Control
7
6
HPOUT_VU
HPOUTRZC
0
0
Writing a 1 to this bit will update HPOUTL and
HPOUTR volumes simultaneously.
Right Headphone Output Zero Cross Enable
0 = disabled
Output Volume
Control
1 = enabled
Right Headphone Output Volume
000000 = -57dB
Output Volume
Control
5:0
HPOUTR_VOL 10_1101
[5:0]
000001 = -56dB
(… 1dB steps)
111001 = 0dB
(… 1dB steps)
111110 = +5dB
111111 = +6dB
Register 3Ah Analogue OUT1 Right
PP, Rev 3.3, September 2012
158
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
