WM8940CGEFLSLASHV datasheet(48/91 Pages) WOLFSON

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WM8940

Production Data

PD, Rev 4.3, November 2011

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R54

Speaker

volume control

SPKZC

Speaker Volume control zero cross

enable:

1 = Change gain on zero cross only

0 = Change gain immediately

SPKMUTE

Speaker output mute enable

0=Speaker output enabled

1=Speaker output muted (VMIDOP)

5:0

SPKVOL

[5:0]

111001

(0dB)

Speaker Volume Adjust

111111 = +6dB

111110 = +5dB

… (1.0 dB steps)

111001=0dB

…

000000=-57dB

Table 35 SPKOUT 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 either 31Hz or 47Hz.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

Additional

control

SLOWCLKEN

Slow clock enable. Used for both the jack

insert detect de-bounce circuit and the

zero cross timeout.

0 = slow clock disabled

1 = slow clock enabled

Table 36 Timeout Clock Enable Control

MONO MIXER AND OUTPUT

The MONOOUT pin can drive a 16

 or 32 headphone or a line output or be used as a DC

reference for a headphone output (see Headphone Output section). It can be selected to drive out

any combination of DAC, Bypass (output of input BOOST stage) and AUX. This output is enabled by

setting bit MONOEN.

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