WM8912 datasheet(92/128 Pages) WOLFSON

92 / 128 page

WM8912

Production Data

PD, Rev 4.0, September 2010

ADDRESS

VALUE

DESCRIPTION

R108 (6Ch)

Write Sequencer 0

0100h

WSEQ_ENA = 1

WSEQ_WRITE_INDEX = 0_0000

R111 (6Fh)

Write Sequencer 3

0100h

WSEQ_ABORT = 0

WSEQ_START = 1

WSEQ_START_INDEX = 0_0000

R33 (21h)

DAC Digital 1

0000h

DAC_MONO = 0

DAC_SB_FILT = 0

DAC_MUTERATE = 0

DAC_UNMUTE_RAMP = 0

DAC_OSR128 = 0

DAC_MUTE = 0

DEEMPH = 00

Table 62 Quick Start-up Control

The WSEQ_BUSY bit (in Register R112, see Table 56) will be set to 1 while the sequence runs.

When this bit returns to 0, the device has been set up and is ready for DAC playback operation.

FAST START-UP FROM STANDBY

The default start-up sequence runs the DC Servo to remove DC offsets from the outputs. The offset

for this path selection is then stored in memory. Provided that power is maintained to the chip, and a

software reset is not performed, then the DC offset correction will be held in memory on the

WM8912. This allows the DC Servo calibrations to be omitted from the start-up sequence if the offset

correction has already been performed. By omitting this part of the start-up sequence, a fast start-up

time of less than 50ms can be achieved.

The register write sequence described in Table 63 replaces the default DC Servo operation with

dummy operations, allowing a fast start-up to be achieved, assuming the device is initially in a

standby condition with DC offset correction previously performed.

Note that, if power is removed from the WM8912 or if a software reset is performed, then the default

sequence will be restored, and the DC offset correction will be necessary on the output paths once

more.

ADDRESS

VALUE

DESCRIPTION

R108 (6Ch)

Write Sequencer 0

0111h

WSEQ_ENA = 1

WSEQ_WRITE_INDEX = 1_0001

R109 (6Dh)

Write Sequencer 1

00FFh

WSEQ_DATA_WIDTH = 000

WSEQ_DATA_START = 0000

WSEQ_ADDR = 1111_1111

R110 (6Eh)

Write Sequencer 2

0000h

WSEQ_EOS = 0

WSEQ_DELAY = 0000

WSEQ_DATA = 0000_0000

R111 (6Fh)

Write Sequencer 3

0100h

WSEQ_ABORT = 0

WSEQ_START = 1

WSEQ_START_INDEX = 00_0000

R33 (21h)

DAC Digital 1

0000h

DAC_MONO = 0

DAC_SB_FILT = 0

DAC_MUTERATE = 0

DAC_UNMUTE_RAMP = 0

DAC_OSR128 = 0

DAC_MUTE = 0

DEEMPH = 00

Table 63 Fast Start-up from Standby Control

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