WM8978GEFLSLASHV datasheet(46/78 Pages) WOLFSON

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WM8978

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PP Rev 1.7 January 2005

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

LOUT2ZC

Speaker volume zero cross enable:

1 = Change gain on zero cross only

0 = Change gain immediately

LOUT2MUTE

Left speaker output mute:

0 = Normal operation

1 = Mute

5:0

LOUT2VOL

111001

Left speaker output volume:

000000 = -57dB

...

111001 = 0dB

...

111111 = +6dB

R54

LOUT2 (SPK)

Volume

control

SPKVU

Not latched

LOUT2 and ROUT2 volumes do not

update until a 1 is written to SPKVU

(in reg 54 or 55)

ROUT2ZC

Speaker volume zero cross enable:

1 = Change gain on zero cross only

0 = Change gain immediately

ROUT2MUTE

Right speaker output mute:

0 = Normal operation

1 = Mute

5:0

ROUT2VOL

111001

Right speaker output volume:

000000 = -57dB

...

111001 = 0dB

...

111111 = +6dB

R55

ROUT2 (SPK)

Volume

control

SPKVU

Not latched

LOUT2 and ROUT2 volumes do not

update until a 1 is written to SPKVU

(in reg 54 or 55)

Table 35 Speaker 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 36 Timeout Clock Enable Control

OUT3/OUT4 MIXERS AND OUTPUT STAGES

The OUT3/OUT4 pins can provide an additional stereo line output, a mono output, or a pseudo

ground connection for headphones. There is a dedicated analogue mixer for OUT3 and one for

OUT4 as shown in Figure 19.

The OUT3 and OUT4 output stages are powered from SPKVDD and SPKGND. The individually

controllable outputs also incorporate an optional 1.5x boost and level shifing stage.

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