WM8959 datasheet(63/155 Pages) WOLFSON

63 / 155 page

Pre-Production

WM8959

PP, May 2008, Rev 3.1

The speaker mixer SPKMIX, the speaker PGA SPKPGA and the outputs SPKN and SPKP are

controlled as described in Table 29. Care should be taken to avoid clipping when enabling more than

one path to the speaker mixer.

when more than one full scale signal is input to the mixer. Fine adjustment of the speaker output can

be made using the SPKVOL register field.

To prevent "zipper noise" when adjusting the SPKVOL, a zero-cross function is provided so that,

when enabled, volume updates will not take place until a zero-crossing is detected. In the event of a

long period without zero-crossings, a timeout function is available. When this function is enabled

(using the TOCLK_ENA register bit), the volume will update after the timeout period if no earlier zero-

cross has occurred. The timeout period is set by TOCLK_RATE. See “Clocking and Sample Rates”

for more information on these fields.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

LB2SPK

AINLMUX Output to SPKMIX

0 = Mute

1 = Un-mute

RB2SPK

AINRMUX Output to SPKMIX

0 = Mute

1 = Un-mute

LI2SPK

LIN2 to SPKMIX

0 = Mute

1 = Un-mute

RI2SPK

RIN2 to SPKMIX

0 = Mute

1 = Un-mute

LOPGASPK

LOPGA to SPKMIX

0 = Mute

1 = Un-mute

ROPGASPK

ROPGA to SPKMIX

0 = Mute

1 = Un-mute

LDSPK

Left DAC to SPKMIX

0 = Mute

1 = Un-mute

Note: LDSPK must be muted when

LDLO=1

R54 (36h)

RDSPK

Right DAC to SPKMIX

0 = Mute

1 = Un-mute

Note: RDSPK must be muted when

RDRO=1

R34 (22h)

1:0

SPKATTN

[1:0]

11b

Speaker Output Attenuation (SPKN

and SPKP)

00 = 0dB

01 = -6dB

10 = -12dB

11 = mute

SPKZC

SPKPGA Zero Cross Enable

0 = Zero cross disabled

1 = Zero cross enabled

R38 (26h)

6:0

SPKVOL

[6:0]

79h

(0dB)

SPKPGA Volume

(see Table 28 for SPKPGA volume

control range)

Table 29 Speaker Output Volume Control

WM8959 Datasheet(PDF) 63 Page - Wolfson Microelectronics plc

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