WM8985
Pre-Production
REGISTER
ADDRESS
BIT
LABEL
DACVOLL
DEFAULT
DESCRIPTION
REFER TO
7:0
11111111
Left DAC Digital Volume Control
0000 0000 = Digital Mute
0000 0001 = -127dB
Digital to
Analogue
Converter
(DAC)
0000 0010 = -126.5dB
... 0.5dB steps up to
1111 1111 = 0dB
12 (0Ch)
8
DACVU
N/A
DAC left and DAC right volume do not update
until a 1 is written to DACVU (in reg 11 or 12)
Output Signal
Path
7:0
DACVOLR
11111111
Right DAC Digital Volume Control
0000 0000 = Digital Mute
0000 0001 = -127dB
Output Signal
Path
0000 0010 = -126.5dB
... 0.5dB steps up to
1111 1111 = 0dB
13 (0Dh)
8
0
Reserved. Initialise to 0
7:4
JD_EN1
JD_EN0
0000
Output enabled when selected jack detection
input is logic 1
Output
Switching
(Jack Detect)
[4]= OUT1_EN_1
[5]= OUT2_EN_1
[6]= OUT3_EN_1
[7]= OUT4_EN_1
3:0
0000
Output enabled when selected jack detection
input is logic 0.
Output
Switching
(Jack Detect)
[0]= OUT1_EN_0
[1]= OUT2_EN_0
[2]= OUT3_EN_0
[3]= OUT4_EN_0
14 (0Eh)
8
HPFEN
1
Analogue to
Digital
Converter
(ADC)
High Pass Filter Enable
0=disabled
1=enabled
7
HPFAPP
HPFCUT
0
Select audio mode or application mode
0=Audio mode (1st order, fc = ~3.7Hz)
1=Application mode (2nd order, fc = HPFCUT)
Analogue to
Digital
Converter
(ADC)
6:4
3
000
0
Application mode cut-off frequency
See Figure 15 for details.
Analogue to
Digital
Converter
(ADC)
ADCOSR
128
ADC oversample rate select
0 = 64x (lowest power)
1 = 128x (best SNR)
Reserved. Initialise to 0
ADC right channel polarity adjust:
0=normal
Power
Management
2
1
0
0
ADCRPOL
ADCLPOL
ADCVU
Analogue to
Digital
Converter
(ADC)
1=inverted
0
8
0
ADC left channel polarity adjust:
0=normal
Analogue to
Digital
Converter
(ADC)
1=inverted
15 (0Fh)
N/A
ADC left and ADC right volume do not update
until a 1 is written to ADCVU (in reg 16 or 17)
Analogue to
Digital
Converter
(ADC)
PP, Rev 3.4, October 2006
96
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
