wm9090 Wolfson Microelectronics plc, wm9090 Datasheet - Page 20

• Manufacturer Part Number: wm9090
• Description: Ultra Low Power Audio Subsystem
• Manufacturer: Wolfson Microelectronics plc

WM9090
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Table 4 Output Signal Paths Enable
SPEAKER MIXER CONTROL
The signal path configuration registers for the Speaker Mixer are described in Table 5. Each of the
input PGAs IN1A, IN1B, IN2A and IN2B is independently selectable as an input to the Speaker
Mixer.
Care should be taken when enabling more than one path to a Speaker Mixer in order to avoid
clipping. The gain of each input path is adjustable using a selectable volume control in each path to
facilitate this.
The Speaker Mixer output can be muted or enabled using the SPKMIX_MUTE register bit. The
Speaker Mixer volume is also controlled by the Speaker Output PGA, as defined in Table 6.
(3)
R54 (36h)
Speaker Mixer
R34 (22h)
SPKMIXL
Attenuation
REGISTER
ADDRESS
REGISTER
ADDRESS
BIT
BIT
7:6
5:4
3:2
5
4
3
6
4
2
0
8
MIXOUTL_ENA
MIXOUTR_ENA
SPKMIX_ENA
IN1A_TO_SPKMIX
IN1B_TO_SPKMIX
IN2A_TO_SPKMIX
IN2B_TO_SPKMIX
SPKMIX_MUTE
IN1A_SPKMIX_VOL
IN1B_SPKMIX_VOL
IN2A_SPKMIX_VOL
LABEL
LABEL
DEFAULT
DEFAULT
0
0
0
00
00
00
0
0
0
0
1
MIXOUTL Headphone Mixer Enable
0 = Disabled
1 = Enabled
MIXOUTR Headphone Mixer
Enable
0 = Disabled
1 = Enabled
SPKMIX Speaker Mixer Enable
0 = Disabled
1 = Enabled
IN1A to SPKMIX enable
0 = Disabled
1 = Enabled
IN1B to SPKMIX enable
0 = Disabled
1 = Enabled
IN2A to SPKMIX enable
0 = Disabled
1 = Enabled
IN2B to SPKMIX enable
0 = Disabled
1 = Enabled
SPKMIX Output mute
0 = Un-Mute
1 = Mute
IN1A to SPKMIX volume control
00 = 0dB
01 = -6dB
10 = -9dB
11 = -12dB
IN1B to SPKMIX volume control
00 = 0dB
01 = -6dB
10 = -9dB
11 = -12dB
IN2A to SPKMIX volume control
00 = 0dB
01 = -6dB
10 = -9dB
11 = -12dB
PP, January 2010, Rev 3.0
DESCRIPTION
DESCRIPTION
Pre-Production
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