WM8994ECSSLASHR datasheet(139/363 Pages) CIRRUS

139 / 363 page

WM8994

Rev 4.6

139

Writing a logic 1 to DCS_TRIG_SINGLE_n initiates a single DC offset measurement and adjustment

to the a

ssociated output; (‘n’ = 0 for Left channel, 1 for Right channel). This will adjust the DC offset

correction on the selected channel by no more than 1LSB (0.25mV).

Setting DCS_TIMER_PERIOD_01 to a non-zero value will cause a single DC offset measurement and

adjustment to be scheduled on a periodic basis. Periodic rates ranging from every 0.52s to in excess

of 2 hours can be selected.

Writing a logic 1 to DCS_TRIG_SERIES_n initiates a series of DC offset measurements and applies

the necessary correction to the associated output. The number of DC Servo operations performed is

determined by DCS_SERIES_NO_01. A maximum of 128 operations may be selected, though a much

lower value will be sufficient in most applications.

The DC Servo control fields associated with active modes (suitable for use on a signal path that is in

active use) are described in Table 72.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R84 (0054h)

DC Servo (1)

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 (0055h)

DC Servo (2)

11:5

DCS_SERIES_NO_

01 [6:0]

010 1010

Number of DC Servo updates to

perform in a series event.

0 = 1 update

1 = 2 updates

...

127 = 128 updates

3:0

DCS_TIMER_PERI

OD_01 [3:0]

1010

Time between periodic updates.

Time is calculated as

0.251s x (2^PERIOD),

where PERIOD =

DCS_TIMER_PERIOD_01.

0000 = Off

0001 = 0.502s

….

1010 = 257s (4min 17s)

1111 = 8225s (2hr 17min)

Table 72 DC Servo Active Modes

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