WM8768 Datasheet, PDF (29/38 Pages) Wolfson Microelectronics plc – 24-bit, 192kHz 8-Channel DAC

Production Data
WM8768
POWERDOWN MODE AND DAC DISABLE
Setting the PDWN register bit immediately powers down the DACs on the WM8768, overriding the
DACD powerdown bits control bits. All trace of the previous input samples is removed, but all control
register settings are preserved. When PDWN is cleared the digital filters will be reinitialised
REGISTER ADDRESS BIT LABEL
0000010
2 PDWN
Powerdown Control
DEFAULT
0
DESCRIPTION
Power Down all DAC’s Select:
0: All DACs enabled
1: All DACs disabled
The DACs may also be powered down individually by setting the DACPD disable bits. Each Stereo
DAC channel has a separate disable DACPD[2:0]. Setting DACPD for a channel will disable the
DACs and select a low power mode.
REGISTER ADDRESS BIT LABEL DEFAULT
DESCRIPTION
0001010
3:1 DACD[2:0]
000
DAC Disable
Powerdown Control
0001111
1
DACD4
0
DAC 4 Powerdown
DAC4 Control
{DACD4,DACD [2:0]}
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
DAC
CHANNEL 4
Active
Active
Active
Active
Active
Active
Active
Active
DISABLE
DISABLE
DISABLE
DISABLE
DISABLE
DISABLE
DISABLE
DISABLE
Table 15 DAC Disable Control
DAC
CHANNEL 3
Active
Active
Active
Active
DISABLE
DISABLE
DISABLE
DISABLE
Active
Active
Active
Active
DISABLE
DISABLE
DISABLE
DISABLE
DAC
CHANNEL 2
Active
Active
DISABLE
DISABLE
Active
Active
DISABLE
DISABLE
Active
Active
DISABLE
DISABLE
Active
Active
DISABLE
DISABLE
DAC
CHANNEL 1
Active
DISABLE
Active
DISABLE
Active
DISABLE
Active
DISABLE
Active
DISABLE
Active
DISABLE
Active
DISABLE
Active
DISABLE
MASTER POWERDOWN
Control bit PWRDNALL overrides the {DACD4,DACD[2:0]} bits and powers everything down
including the reference VMID. It is recommended that the DACs are powered down first before
setting this bit.
REGISTER ADDRESS
0001010
Interface Control
BIT
LABEL
4 PWRDNALL
DEFAULT
0
DESCRIPTION
Master Power down bit
0: Not powered down
1: Powered down
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PD Rev 4.3 July 2010
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