WM9090ECSSLASHR datasheet(22/81 Pages) WOLFSON

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WM9090

Production Data

PD, November 2010, Rev 4.1

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

3:2

IN2A_SPKMIX_VOL

IN2A to SPKMIX volume control

00 = 0dB

01 = -6dB

10 = -9dB

11 = -12dB

1:0

IN2B_SPKMIX_VOL

[1:0]

IN2B to SPKMIX volume control

00 = 0dB

01 = -6dB

10 = -9dB

11 = -12dB

Table 5 Speaker Mixer (SPKMIX) Control

SPEAKER OUTPUT VOLUME CONTROL

The speaker output PGA controls are shown in Table 6.

A zero-cross function is provided on the speaker output PGA. Note that the timeout clock TOCLK

must be enabled when using the zero-cross function. See “Clocking Control” for more information on

the TOCLK control fields.

The SPKOUT_VU bit controls the loading of the speaker PGA volume data. This bit should be set to

1 whenever the SPKOUTL_VOL register is updated.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R38 (26h)

Speaker

Volume Left

SPKOUT_VU

N/A

Speaker Output PGA Volume

Update

Writing a 1 to this bit will update the

SPKOUTL volume.

SPKOUTL_ZC

Speaker Output PGA Zero Cross

Control

0 = Change gain immediately

1 = Change gain on zero cross only

SPKOUTL_MUTE

Speaker Output PGA Mute

0 = Un-mute

1 = Mute

5:0

SPKOUTL_VOL [5:0]

39h

(0dB)

Speaker Output PGA Volume

-57dB to +6dB in 1dB steps

(See Table 11 for output PGA

volume control range)

Table 6 Speaker Output PGA Control

SPEAKER BOOST MIXER CONTROL

The Class D speaker driver also incorporates its own boost mixer.

The boost mixer provides an additional AC gain (boost) function to shift signal levels between the

AVDD and SPKVDD voltage domains for maximum output power. The AC gain (boost) function is

described in the “Analogue Outputs” section.

The SPKMIXL_TO_SPKOUTL register bit must be enabled when using the speaker output signal

path, as described in Table 7. Note that this is the default condition.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R36 (24h)

SPKOUT

Mixers

SPKMIXL_TO_SPKOU

SPKMIX to Speaker Output enable

0 = Disabled

1 = Enabled

Table 7 Speaker Boost Mixer Control

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