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WM8944BECS/R 데이터시트(PDF) 58 Page - Cirrus Logic

부품명 WM8944BECS/R
상세설명  Mono Low-Power CODEC with Video Buffer
PDF  165 Pages
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제조업체  CIRRUS [Cirrus Logic]
홈페이지  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8944BECS/R 데이터시트(HTML) 58 Page - Cirrus Logic

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WM8944B
58
Rev 4.3
SPEAKER OUTPUT CONTROL
Each Speaker output has its own output mixer. This allows the output of the Speaker PGA to be
enabled or disabled, and also allows the AUX and IN1 inputs to be routed directly to the Speaker
outputs. (AUX can be routed to SPKOUTP; IN1 can be routed to SPKOUTN, as illustrated in Figure
18. The two Speaker outputs can be muted also, using SPKN_OP_MUTE and SPKP_OP_MUTE.
As described above, the analogue inputs AUX and IN1 can be routed directly to the Speaker outputs,
bypassing the Speaker PGA and mixers. This can be used to provide a fixed-gain signal path that is
unaffected by the Speaker PGA setting. This feature is intended for a “PC Beep” or similar
applications.
Care should be taken when enabling more than one path to the Speaker Output mixers in order to
avoid clipping. The gain of each input path is adjustable using a selectable -6dB control in each path
to facilitate this.
The Speaker Output control registers are described in Table 36.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R3 (03h)
Power
Management
1
9
SPKN_OP_MUTE
1
SPKOUTN Output Mute
0 = Disable Mute
1 = Enable Mute
8
SPKP_OP_MUTE
1
SPKOUTP Output Mute
0 = Disable Mute
1 = Enable Mute
R43 (2Bh)
SPK mixer
control 1
8
AUX_TO_SPKP
0
AUX to SPKOUTP select
0 = Disabled
1 = Enabled
7
PGA_TO_SPKP
0
Speaker PGA Mixer to SPKOUTP
select
0 = Disabled
1 = Enabled
R44 (2Ch)
SPK mixer
control2
9
IN1_TO_SPKN
0
IN1 to SPKOUTN select
0 = Disabled
1 = Enabled
7
PGA_TO_SPKN
0
Speaker PGA Mixer to SPKOUTN
select
0 = Disabled
1 = Enabled
R45 (2Dh)
SPK mixer
control3
8
AUX_TO_SPKP_
ATTEN
0
AUX to SPKOUTP attenuation
0 = 0dB
1 = -6dB attenuation
7
PGA_TO_SPKP_
ATTEN
0
Speaker PGA Mixer to SPKOUTP
attenuation
0 = 0dB
1 = -6dB attenuation
R46 (2Eh)
SPK mixer
control4
9
IN1_TO_SPKN_
ATTEN
0
IN1 to SPKOUTN attenuation
0 = 0dB
1 = -6dB attenuation
7
PGA_TO_SPKN_
ATTEN
0
Speaker PGA Mixer to SPKOUTN
attenuation
0 = 0dB
1 = -6dB attenuation
Table 36 Speaker Output Control



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