WM8986_07 WOLFSON [Wolfson Microelectronics plc], WM8986_07 Datasheet - Page 45

• Manufacturer Part Number: WM8986_07
• Description: Multimedia DAC With Class D Headphone and Line Out
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

Pre-Production
w
Table 25 OUT2 Volume Control
ZERO CROSS TIMEOUT
A zero-cross timeout function is provided so that if zero cross is enabled on the input or output PGAs
the gain will automatically update after a timeout period if a zero cross has not occurred. This is
enabled by setting SLOWCLKEN. The timeout period is dependent on the clock input to the digital
and is equal to 2
Table 26 Timeout Clock Enable Control
Note: SLOWCLKEN is also used for the jack insert detect debounce circuit
R54 (36h)
LOUT2
Volume
control
R55 (37h)
ROUT2
Volume
control
R7 (07h)
Additional
Control
REGISTER
ADDRESS
REGISTER
ADDRESS
21
* SYSCLK period.
5:0
6
7
8
5:0
6
7
8
0
BIT
BIT
LOUT2VOL
LOUT2MUTE
LOUT2ZC
OUT2VU
ROUT2VOL
ROUT2MUTE
ROUT2ZC
OUT2VU
SLOWCLKEN
LABEL
LABEL
0
DEFAULT
Not latched
Not latched
DEFAULT
111001
111001
0
0
0
0
Slow clock enable.
0 = slow clock disabled
1 = slow clock enabled
(1dB steps)
000000 = -57dB
...
111001 = 0dB
...
111111 = +6dB
Left output mute:
0 = Normal operation
1 = Mute
LOUT2 volume zero cross enable:
1 = Change gain on zero cross only
0 = Change gain immediately
LOUT2 and ROUT2 volumes do not
update until a 1 is written to
OUT2VU (in reg 54 or 55)
Right output volume:
(1dB steps)
000000 = -57dB
...
111001 = 0dB
...
111111 = +6dB
Right output mute:
0 = Normal operation
1 = Mute
ROUT2 volume zero cross enable:
1 = Change gain on zero cross only
0 = Change gain immediately
LOUT2 and ROUT2 volumes do not
update until a 1 is written to
OUT2VU (in reg 54 or 55)
Left output volume:
PP, Rev 3.1, February 2007
DESCRIPTION
DESCRIPTION
WM8986
45