wm8400 Wolfson Microelectronics plc, wm8400 Datasheet - Page 88

• Manufacturer Part Number: wm8400
• Description: Wolfson Audioplustm Hi-fi Audio Codec And Power Management Unit For Mobile Multimedia
• Manufacturer: Wolfson Microelectronics plc

WM8400
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The speaker mixer SPKMIX and its outputs SPKN and SPKP are controlled as described in Table
54. Care should be taken to avoid clipping when enabling more than one path to the speaker mixer.
Register bits SPKATTN control the speaker output attenuation and can be used to avoid clipping
when more than one full scale signal is input to the mixer.
Table 54 Speaker Output Volume Control
R54 (36h)
R34 (22h)
REGISTER
ADDRESS
BIT
1:0
7
6
5
4
3
2
1
0
LB2SPK
RB2SPK
LI2SPK
RI2SPK
LOPGASPK
ROPGASPK
LDSPK
RDSPK
SPKATTN
[1:0]
LABEL
DEFAULT
0b
0b
0b
0b
0b
0b
0b
0b
11b
AINLMUX Output to SPKMIX
0 = Mute
1 = Un-mute
AINRMUX Output to SPKMIX
0 = Mute
1 = Un-mute
LIN2 to SPKMIX
0 = Mute
1 = Un-mute
RIN2 to SPKMIX
0 = Mute
1 = Un-mute
LOPGA to SPKMIX
0 = Mute
1 = Un-mute
ROPGA to SPKMIX
0 = Mute
1 = Un-mute
Left DAC to SPKMIX
0 = Mute
1 = Un-mute
Note: LDSPK must be muted when
LDLO=1
0 = Mute
1 = Un-mute
Note: RDSPK must be muted when
RDRO=1
Speaker Output Attenuation (SPKN
and SPKP)
00 = 0dB
01 = -6dB
10 = -12dB
11 = mute
Right DAC to SPKMIX
DESCRIPTION
PP, April 2009, Rev 3.0
Pre-Production
88