WM8993 datasheet(121/229 Pages) WOLFSON

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Production Data

WM8993

PD, November 2010, Rev 4.0

121

Note: When the digital sidetone is enabled, ADC data will also be added to DAC digital data input

path within the Digital Mixing circuit. This applies regardless of whether LOOPBACK is enabled.

DIGITAL PULL-UP AND PULL-DOWN

The WM8993 provides integrated pull-up and pull-down resistors on each of the MCLK, DACDAT,

LRCLK and BCLK pins. This provides a flexible capability for interfacing with other devices. Each of

the pull-up and pull-down resistors can be configured independently using the register bits described

in Table 79.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R122 (7Ah)

Digital Pulls

MCLK_PU

MCLK pull-up resistor enable

0 = pull-up disabled

1 = pull-up enabled

MCLK_PD

MCLK pull-down resistor enable

0 = pull-down disabled

1 = pull-down enabled

DACDAT_PU

DACDAT pull-up resistor enable

0 = pull-up disabled

1 = pull-up enabled

DACDAT_PD

DACDAT pull-down resistor enable

0 = pull-down disabled

1 = pull-down enabled

LRCLK_PU

LRCLK pull-up resistor enable

0 = pull-up disabled

1 = pull-up enabled

LRCLK_PD

LRCLK pull-down resistor enable

0 = pull-down disabled

1 = pull-down enabled

BCLK_PU

BCLK pull-up resistor enable

0 = pull-up disabled

1 = pull-up enabled

BCLK_PD

BCLK pull-down resistor enable

0 = pull-down disabled

1 = pull-down enabled

Table 79 Digital Audio Interface Pull-Up and Pull-Down Control

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