WM8281ECSSLASHR datasheet(298/392 Pages) CIRRUS

298 / 392 page

WM8281

298

Rev 4.0

JACK DETECT, GPIO, MICDET CLAMP, AND WAKE-UP SEQUENCES

The WM8281 supports external accessory detection and GPIO functions. The JD1 signal (associated

with external accessory detection) and the GP5 signal (associated with the GPIO5 pin) can be used to

trigger the Control Write Sequencer.

The JD1 signal is configured using the register bits described in Table 75. The GP5 signal is derived

from the GPIO5 pin, which is configured using the register bits described in Table 86.

The MICDET Clamp is controlled by the JD1 and/or GP5 signals, as described in Table 76. The

MICDET Clamp status can also be used to trigger the Control Write Sequencer.

A Control Write Sequence can be associated with a rising edge and/or a falling edge of the JD1, GP5

or MICDET Clamp. This is configured using the register bits described in Table 85.

If one of the selected logic conditions is detected, the Control Write Sequencer will be triggered. The

applicable start index location within the sequencer memory is separately configurable for each logic

condition.

The WSEQ_GP5_RISE_INDEX register defines the sequencer start index corresponding to a GP5

Rising Edge event. Equivalent start index values are defined for the other logic conditions, as

described in Table 118.

Note that a sequencer start index of 1FFh will cause the respective sequence to be aborted.

The JD1, GP5 and MICDET Clamp control sequences are undefined following Power-On Reset

(POR), but can be user-programmed after power-up. Note that all control sequences are maintained

in the sequencer memory through Hardware Reset, Software Reset and in Sleep mode.

See “Low Power Sleep Configuration” for further details of the JD1, GP5 and MICDET Clamp status

signals. See also “General Purpose Input / Output” for details of the GPIO5 pin.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R102

(0066h)

Always On

Triggers

Sequence

Select 1

8:0

WSEQ_MICD_CL

AMP_RISE_INDE

X [8:0]

1FFh

MICDET Clamp (Rising) Write Sequence

start index

This field contains the index location in

the sequencer memory of the first

command in the sequence associated

with MICDET Clamp (Rising) detection.

Valid from 0 to 509 (1FDh)

R103

(0067h)

Always On

Triggers

Sequence

Select 2

8:0

WSEQ_MICD_CL

AMP_FALL_INDE

X [8:0]

1FFh

MICDET Clamp (Falling) Write Sequence

start index

This field contains the index location in

the sequencer memory of the first

command in the sequence associated

with MICDET Clamp (Falling) detection.

Valid from 0 to 509 (1FDh)

R104

(0068h)

Always On

Triggers

Sequence

Select 3

8:0

WSEQ_GP5_RIS

E_INDEX [8:0]

1FFh

GP5 (Rising) Write Sequence start index

This field contains the index location in

the sequencer memory of the first

command in the sequence associated

with GP5 (Rising) detection.

Valid from 0 to 509 (1FDh)

R105

(0069h)

Always On

Triggers

Sequence

Select 4

8:0

WSEQ_GP5_FAL

L_INDEX [8:0]

1FFh

GP5 (Falling) Write Sequence start index

This field contains the index location in

the sequencer memory of the first

command in the sequence associated

with GP5 (Falling) detection.

Valid from 0 to 509 (1FDh)

R106

(006Ah)

Always On

Triggers

Sequence

Select 5

8:0

WSEQ_JD1_RIS

E_INDEX [8:0]

1FFh

JD1 (Rising) Write Sequence start index

This field contains the index location in

the sequencer memory of the first

command in the sequence associated

with JD1 (Rising) detection.

Valid from 0 to 509 (1FDh)

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