WM8753L
Advanced Information
REGISTER
ADDRESS
BIT
LABEL
LO1VU
DEFAULT
DESCRIPTION
Left Volume Update
0 = Store LOUT1VOL in intermediate
latch (no gain change)
1 = Update left and right channel gains
(left = LOUT1VOL, right = intermediate
latch)
R40 (28h)
LOUT1
Volume
8
7
0
LO1ZC
0
Left zero cross enable
1 = Change gain on zero cross only
0 = Change gain immediately
6:0
LOUT1VOL
[6:0]
1111001
(0dB)
LOUT1 Volume
1111111 = +6dB
… (1.0 dB steps)
0110000 = -73dB
0101111 to 0000000
MUTE
= Analogue
R41 (29h)
ROUT1
Volume
8
RO1VU
RO1ZC
0
Right Volume Update
0 = Store ROUT1VOL in intermediate
latch (no gain change)
1 = Update left and right channel gains
(left
= intermediate latch, right =
ROUT1VOL)
7
0
Left zero cross enable
1 = Change gain on zero cross only
0 = Change gain immediately
6:0
ROUT1VOL
[6:0]
1111001
ROUT1 Volume
Similar to LOUT1VOL
Table 35 LOUT1/ROUT1 Volume Control
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].
REGISTER
ADDRESS
BIT
6:0
LABEL
DEFAULT
DESCRIPTION
Same as LOUT1VOL
R42 (2Ah)
LOUT2
LOUT2VOL
[6:0]
1111001
(0dB)
Volume
7
LO2ZC
0
Left zero cross enable
1 = Change gain on zero cross only
0 = Change gain immediately
8
LO2VU
0
Same as LO1VU
R43 (2Bh)
ROUT2
6:0
ROUT2VOL
[6:0]
1111001
(0dB)
Same as ROUT1VOL
Volume
7
RO2ZC
0
Left zero cross enable
1 = Change gain on zero cross only
0 = Change gain immediately
8
2
RO2VU
0
0
Same as RO1VU
R45 (2Dh)
Output
Control
ROUT2INV
ROUT2 Invert
0 = No Inversion (0° phase shift)
1 = Signal inverted (180° phase shift)
Table 36 LOUT2/ROUT2 Volume Control
AI Rev 3.1 June 2004
43
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
