WM8741 datasheet(39/63 Pages) WOLFSON

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WM8741

PP Rev 1.3 October 2007

DSD MUTE CONTROL

In DSD Direct mode, an analogue mute can be applied at the output of the DAC. This is controlled

by register bit AMUTE.

BIT

LABEL

DEFAULT

DESCRIPTION

Volume Control

04h

AMUTE

DSD Direct mute control:

0 = mute off

1 = mute on

Table 40 DSD Analogue Mute Control

POWER SAVING STANDBY CONTROL

Setting the PWDN register bit immediately connects all outputs to VMID and resets the digital sections

of the DAC system including the DLL, the audio interface and the DSP. Input data samples are not

preserved, but all control register settings are maintained. When PWDN is cleared the WM8741 will

repeat its power-on initialisation sequence.

BIT

LABEL

DEFAULT

DESCRIPTION

Format Control

05h

PWDN

Power Down Mode Select:

0 = Normal Mode

1 = Power Down Mode

Table 41 Powerdown Control

HARDWARE CONTROL MODE

When the MODE pin is held ‘low’ the WM8741 is set to hardware control mode and a limited feature

set can be configured.

NAME

DESCRIPTION

MODE/

LRSEL

0 = Hardware control mode

1 = 3-wire serial control mode

Z = 2-wire serial control mode

Table 42 MODE/LRSEL Hardware Control Pin Function

DSD AND PCM MODE SWITCHING

The audio interface mode can be switched between DSD Direct and PCM by controlling the state of

pin DSD. It is recommended that the chip is forced into a MUTE state before dynamically switching

modes.

NAME

DESCRIPTION

SCLK/DSD

0 = PCM Mode

1 = DSD Direct Mode

Table 43 SCLK/DSD Hardware Control Pin Function

AUDIO INPUT FORMAT

Under hardware control, it is possible to select between four different modes of operation for the

PCM audio interface.

PIN NUMBER

NAME

CSB/SADDR/I2S

IWO/DOUT

DESCRIPTION

16-bit right justified

24-bit right justified

24-bit left justified

STATUS

24-bit I2S

Table 44 CSB/SADDR/I2S and IWO/DOUT Hardware Control Pin Function

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