WM8941 Datasheet, PDF (28/96 Pages) Wolfson Microelectronics plc – Mono CODEC with Speaker Driver and Video Buffer

WM8941
Pre Production
REGISTER
ADDRESS
R18
Notch Filter 1A
BIT
15
LABEL
NF1_UP
14
NF1_EN
13:0
R19
15
Notch Filter 1B
NF1_A0
NF1_UP
13:0 NF1_A1
Table 16 Notch Filter 1 Function
DEFAULT
DESCRIPTION
0
Notch filter 1 update. The notch filter 1
values used internally only update when
one of the NFU bits is set high.
0
Notch Filter 1 enable.
0=Disabled
1=Enabled
0
Notch Filter 1 a0 coefficient
0
Notch filter 1 update. The notch filter 1
values used internally only update when
one of the NFU bits is set high.
0
Notch Filter 1 a1 coefficient
REGISTER
ADDRESS
R20
Notch Filter 2A
BIT
15
LABEL
NF2_UP
14
NF2_EN
13:0
R21
15
Notch Filter 2B
NF2_A0
NF2_UP
13:0 NF2_A1
Table 17 Notch Filter 2 Function
DEFAULT
DESCRIPTION
0
Notch filter 2 update. The notch filter 2
values used internally only update when
one of the NFU bits is set high.
0
Notch Filter 2 enable.
0=Disabled
1=Enabled
0
Notch Filter 2 a0 coefficient
0
Notch filter 2 update. The notch filter 2
values used internally only update when
one of the NFU bits is set high.
0
Notch Filter 2 a1 coefficient
REGISTER
ADDRESS
R22
Notch Filter 3A
BIT
15
LABEL
NF3_UP
14
NF3_EN
13:0
R23
15
Notch Filter 3B
14
NF3_A0
NF3_UP
NF3_LP
13:0 NF3_A1
Table 18 Notch Filter 3 Function
DEFAULT
DESCRIPTION
0
Notch filter 3 update. The notch filter 3
values used internally only update when
one of the NFU bits is set high.
0
Notch Filter 3 enable.
0=Disabled
1=Enabled
0
Notch Filter 3 a0 coefficient
0
Notch filter 3 update. The notch filter 3
values used internally only update when
one of the NFU bits is set high.
0
Notch Filter 3 mode select
0 = Notch Filter mode
1 = Low Pass Filter mode
0
Notch Filter 3 a1 coefficient
The notch filter coefficients must be entered using a sign / magnitude notation. The MSB of
the 14-bit register word (NFx_Ax[13]) is reserved for the sign part, leaving the 13 remaining bits for
the magnitude part.
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PP, Rev 3.3, December 2007
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