WM8946ECSSLASHR datasheet(69/175 Pages) WOLFSON

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Production Data

WM8946

PD, July 2012, Rev 4.3

OUTPUT DISCHARGE CONTROL

The line outputs and speaker outputs can be actively discharged to GND through internal resistors if

desired. This is desirable at start-up in order to achieve a known output stage condition prior to

enabling the soft-start VMID reference voltage. This is also desirable in shut-down to prevent the

external connections from being affected by the internal circuits.

The individual control bits for discharging each audio output are described in Table 44.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R42 (2Ah)

Output ctrl

SPKR_DISCH

Discharges SPKOUTR output via

approx 4k resistor

0 = Not active

1 = Actively discharging SPKOUTR

SPKL_DISCH

Discharges SPKOUTL output via

approx 4k resistor

0 = Not active

1 = Actively discharging SPKOUTL

LINER_DISCH

Discharges LINEOUTR output via

approx 4k resistor

0 = Not active

1 = Actively discharging LINEOUTR

LINEL_DISCH

Discharges LINEOUTL output via

approx 4k resistor

0 = Not active

1 = Actively discharging LINEOUTL

Table 44 Output Discharge Control

DIGITAL AUDIO INTERFACE

The digital audio interface is used for inputting DAC data into the WM8946 and outputting ADC data

from it. It uses four pins:



ADCDAT: ADC data output



DACDAT: DAC data input



LRCLK: DAC and ADC data alignment clock



BCLK: Bit clock, for synchronisation

MASTER AND SLAVE MODE OPERATION

The digital audio interface can be configured as a Master or a Slave interface, using the MSTR

WM8946

ADCDAT

LRCLK

DACDAT

BCLK

Processor

Figure 21 Master Mode

Figure 22 Slave Mode

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