WM8971L Wolfson Microelectronics Ltd., WM8971L Datasheet - Page 34

• Manufacturer Part Number: WM8971L
• Description: Stereo Codec for Portable Audio Applications
• Manufacturer: Wolfson Microelectronics Ltd.

WM8971L
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LOUT2/ROUT2 OUTPUTS
The LOUT2 and ROUT2 output pins are essentially similar to LOUT1 and ROUT1, but they are
independently controlled and can also drive an 8Ω mono speaker (see Speaker Output section). For
speaker drive, the ROUT2 signal must be inverted (ROUT2INV = 1), so that the left and right channel
are mixed to mono in the speaker [L–(-R) = L+R].
Table 23 LOUT2/ROUT2 Volume Control
MONO OUTPUT
The MONOOUT pin can drive a mono line output. The signal volume on MONOOUT can be adjusted
under software control by writing to MONOOUTVOL.
Table 24 MONOOUT Volume Control
R40 (28h)
LOUT2
Volume
R41 (29h)
ROUT2
Volume
R24 (18h)
Additional
Control (2)
R42 (2Ah)
MONOOUT
Volume
REGISTER
REGISTER
ADDRESS
ADDRESS
6:0
7
8
6:0
7
8
4
6:0
7
BIT
BIT
LOUT2VOL
[6:0]
LO2ZC
LO2VU
ROUT2VOL
[6:0]
RO2ZC
RO2VU
ROUT2INV
MONOOUT
VOL [6:0]
MOZC
LABEL
LABEL
1111001
(0dB)
0
0
1111001
(0dB)
0
0
0
1111001
(0dB)
0
DEFAULT
DEFAULT
Similar to LOUT1VOL
Left zero cross enable
1 = Change gain on zero cross only
0 = Change gain immediately
Same as LO1VU
Similar ROUT1VOL
Right zero cross enable
1 = Change gain on zero cross only
0 = Change gain immediately
Same as RO1VU
ROUT2 Invert
0 = No Inversion (0° phase shift)
1 = Signal inverted (180° phase shift)
MONOOUT Volume
1111111 = +6dB
… (80 steps)
0110000 = -67dB
0101111 to 0000000 = Analogue MUTE
MONOOUT zero cross enable
1 = Change gain on zero cross only
0 = Change gain immediately
DESCRIPTION
DESCRIPTION
PD Rev 4.1 August 2005
Production Data
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