wm8982gefl-v Wolfson Microelectronics plc, wm8982gefl-v Datasheet - Page 54

• Manufacturer Part Number: wm8982gefl-v
• Description: Mono Codec With Speaker Driver And Video Buffer
• Manufacturer: Wolfson Microelectronics plc

WM8982
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ZERO CROSS TIMEOUT
A zero-cross timeout function is also 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 42 Timeout Clock Enable Control
MONOOUT MIXER AND OUTPUT STAGE
The MONOOUT pin can provide an additional line output, or a pseudo ground connection for
headphones. There is a dedicated analogue mixer for MONOOUT as shown in Figure 29.
The MONOOUT output stage is powered from SPKVDD and SPKGND. The output also incorporates
an optional 1.5x boost and level shifting stage.
Figure 29 Mono Output Mixer
MONOOUT can provide a buffered midrail headphone pseudo-ground, or a mono line output.
R7
Additional
Control
REGISTER
ADDRESS
21
* input clock period.
0
BIT
SLOWCLKEN
LABEL
0
DEFAULT
Slow clock enable. Used for both the
jack insert detect debounce circuit and
the zero cross timeout.
0 = slow clock disabled
1 = slow clock enabled
PP, Rev 3.2, September 2008
DESCRIPTION
Pre-Production
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