WM8976 datasheet(50/83 Pages) WOLFSON

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WM8976

Preliminary Technical Data

PTD Rev 2.0 February 2005

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

LOUT1ZC

Headphone volume zero cross

enable:

1 = Change gain on zero cross only

0 = Change gain immediately

LOUT1MUTE

Left headphone output mute:

0 = Normal operation

1 = Mute

5:0

LOUT1VOL

111001

Left headphone output volume:

000000 = -57dB

...

111001 = 0dB

...

111111 = +6dB

R52

LOUT1

Volume

control

HPVU

Not latched

LOUT1 and ROUT1 volumes do not

update until a 1 is written to HPVU

(in reg 52 or 53)

ROUT1ZC

Headphone volume zero cross

enable:

1 = Change gain on zero cross only

0 = Change gain immediately

ROUT1MUTE

Right headphone output mute:

0 = Normal operation

1 = Mute

5:0

ROUT1VOL

111001

Right headphone output volume:

000000 = -57dB

...

111001 = 0dB

...

111111 = +6dB

R53

ROUT1

Volume

control

HPVU

Not latched

LOUT1 and ROUT1 volumes do not

update until a 1 is written to HPVU

(in reg 52 or 53)

Table 38 OUT1 Volume Control

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

21 * input clock period.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

Additional

Control

SLOWCLKEN

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

Table 39 Timeout Clock Enable Control

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