WM8945ECSSLASHR datasheet(53/169 Pages) WOLFSON

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Production Data

WM8945

PD, May 2011, Rev 4.1

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

AUX2_TO_OUTL

_ATTEN

AUX2 Audio Input to Left Output

Mixer attenuation

0 = 0dB

1 = -6dB attenuation

AUX1_TO_OUTL

_ATTEN

AUX1 Audio Input to Left Output

Mixer attenuation

0 = 0dB

1 = -6dB attenuation

Table 30 Line Output Mixer (MIXOUTL) Control

SPEAKER PGA MIXER CONTROL

The Speaker PGA mixer controls are described in Table 31 for the left channel (MIXSPKL) and Table

32 for the right channel (MIXSPKR). These allow any of the DAC, Inverted DAC, AUX1/2 and one of

the ADC Bypass signals to be mixed. The output of each PGA mixer can be muted also, using the

SPKL_MIX_MUTE and SPKR_MIX_MUTE bits.

Note that the output from the Speaker PGA mixer is also controlled by the Speaker PGA Volume

control and the Speaker Output control described in the following sections.

Care should be taken when enabling more than one path to the Speaker PGA mixers in order to avoid

clipping. The gain of each input path is adjustable using a selectable -6dB control in each path to

facilitate this.

Note that the attenuation control field DACL_TO_PGAL_ATTEN controls the DAC and the Inverted

DAC mixer paths to the Left Speaker PGA mixer. Similarly, the DACL_TO_PGAR_ATTEN controls

the DAC and the Inverted DAC mixer paths to the Right Speaker PGA mixer. Note that the DAC input

level may also be controlled by the DAC digital volume control – see “Digital to Analogue Converter

(DAC)” for further details.

When the AUX1 or AUX2 pin is used as an audio input, that pin must be configured for audio using

the AUX1_AUDIO or AUX2_AUDIO register bits. These bits are defined in Table 2 (see “Analogue

Input Signal Path”).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R3 (03h)

Power

Management

SPKL_MIX_

MUTE

Left Speaker PGA Mixer Mute

0 = Disable Mute

1 = Enable Mute

R43 (2Bh)

SPK mixer

control 1

BYPL_TO_PGAL

Left Input PGA (ADC bypass) to

Left Speaker PGA Mixer select

0 = Disabled

1 = Enabled

MDACL_TO_

PGAL

Inverted Left DAC to Left Speaker

PGA Mixer select

0 = Disabled

1 = Enabled

DACL_TO_PGAL

Left DAC to Left Speaker PGA

Mixer select

0 = Disabled

1 = Enabled

AUX2_TO_PGAL

AUX2 Audio Input to Left Speaker

PGA Mixer select

0 = Disabled

1 = Enabled

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