WM8993 datasheet(90/229 Pages) WOLFSON

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WM8993

Production Data

PD, November 2010, Rev 4.0

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R84 (54h)

DC Servo 0

DCS_TRIG_SINGLE

Writing 1 to this bit selects a

single DC offset correction for

HPOUT1R.

In readback, a value of 1

indicates that the DC Servo

single correction is in progress.

DCS_TRIG_SINGLE

Writing 1 to this bit selects a

single DC offset correction for

HPOUT1L.

In readback, a value of 1

indicates that the DC Servo

single correction is in progress.

DCS_TRIG_SERIES

Writing 1 to this bit selects a

series of DC offset corrections

for HPOUT1R.

In readback, a value of 1

indicates that the DC Servo DAC

Write correction is in progress.

DCS_TRIG_SERIES

Writing 1 to this bit selects a

series of DC offset corrections

for HPOUT1L.

In readback, a value of 1

indicates that the DC Servo DAC

Write correction is in progress.

R85 (55h)

DC Servo 1

11:5

DCS_SERIES_NO_

01 [6:0]

010 1010

Number of DC Servo updates to

perform in a series event.

0 = 1 updates

1 = 2 updates

...

127 = 128 updates

3:0

DCS_TIMER_PERI

OD_01 [3:0]

1010

Time between periodic updates.

Time is calculated as

0.256s x (2^PERIOD)

0000 = Off

0001 = 0.52s

1010 = 266s (4min 26s)

1111 = 8519s (2hr 22s)

Table 57 DC Servo Active Modes

DC SERVO READBACK

The current DC offset value for each Headphone output channel can be read from Registers R89 and

R90, as described in Table 58. Note that these values may form the basis of settings that are

subsequently used by the DC Servo in DAC Write mode.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R89 (59h)

DC Servo

Readback 1

7:0

DCS_INTEG_CHAN

0000 0000

Readback value for HPOUT1R.

Two’s complement format.

LSB is 0.25mV.

Range is -32mV to +31.75mV

R90 (5Ah)

DC Servo

Readback 2

7:0

DCS_INTEG_CHAN

0000 0000

Readback value for HPOUT1L.

Two’s complement format.

LSB is 0.25mV.

Range is -32mV to +31.75mV

Table 58 DC Servo Readback

WM8993 Datasheet(PDF) 90 Page - Wolfson Microelectronics plc

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