WM9093ECSSLASHR datasheet(24/84 Pages) WOLFSON

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WM9093

Production Data

PD, March 2012, Rev 4.2

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/AB speaker driver has its own boost mixer which performs a dual role.

The boost mixer allows the output from the speaker mixer or from the ‘Voice Bypass’ path to be

routed to the speaker driver. The ‘Voice Bypass’ path is the differential input, IN3+/IN3-, routed

directly to the speaker driver, providing a low power differential path from baseband voice to

loudspeakers.

It is recommended that no more than one of the available signal paths is enabled in the speaker boost

mixer at any time. The signal path configuration registers for the speaker boost mixer are described in

Table 7.

The second function of the speaker boost mixer is to provide an additional AC gain (boost) function to

shift signal levels between the HPVDD and SVDD voltage domains for maximum output power. The

AC gain (boost) function is described in the “Analogue Outputs” section.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R36 (24h)

SPKOUT

Mixers

IN3_TO_SPKOUTL

Voice Bypass (IN3 Differential) to

Speaker Output enable

0 = Disabled

1 = Enabled

SPKMIXL_TO_SPKOU

SPKMIX to Speaker Output enable

0 = Disabled

1 = Enabled

Table 7 Speaker Boost Mixer Control

HEADPHONE MIXER CONTROL

The Headphone Mixer configuration registers are described in Table 8 for the Left Channel

(MIXOUTL) and Table 9 for the Right Channel (MIXOUTR). Each of the input PGAs IN1A, IN1B, IN2A

and IN2B is independently selectable as an input to each of the Headphone Mixers.

Care should be taken when enabling more than one path to a Headphone Mixer in order to avoid

clipping. The gain of each input path is adjustable using a selectable volume control in each path to

facilitate this.

The Headphone Mixer outputs can be muted or enabled using the MIXOUTL_MUTE and

MIXOUTR_MUTE register bits. The Headphone Mixer volume is also controlled by the Headphone

Output PGAs, as defined in Table 10.

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