WM8281ECSSLASHR datasheet(218/392 Pages) CIRRUS

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WM8281

218

Rev 4.0

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

7:5

HP_HOLDTIME

[2:0]

001

Headphone Detect Hold Time

(Selects the hold time between ramp up

and ramp down of the headphone detect

current source. The clock cycle rate is

set by HP_CLK_DIV.)

000 = 1 clock cycle

001 = 4 clock cycles

010 = 16 clock cycles

011 = 64 clock cycles

100 = 256 clock cycles

101 = 512 clock cycles

110 = 768 clock cycles

111 =1024 clock cycles

4:3

HP_CLK_DIV

[1:0]

Headphone Detect Clock Rate

(Selects the clocking rate of the

headphone detect adjustable current

source.)

00 = 32kHz

01 = 16kHz

10 = 8kHz

11 = 4kHz

HP_RATE

Headphone Detect Ramp Rate

0 = Normal rate

1 = Fast rate

HP_POLL

Headphone Detect Enable

Write 1 to start HP Detect function

R668

(029Ch)

Headphone

Detect 2

HP_DONE

Headphone Detect Status

0 = HP Detect not complete

1 = HP Detect done

14:0

HP_LVL [14:0]

0000h

Headphone Detect Level

LSB = 0.5ohm

8 = 4ohm or less

9 = 4.5 ohm

10 = 5 ohm

11 = 5.5 ohm

….

20,000 = 10k ohm or more

When ACCDET_MODE=001 or 010, this

field is valid from 4ohm to10k ohm.

When ACCDET_MODE=100, this field is

valid from 400ohm to 6k ohm.

Note that, when ACCDET_MODE=001

or 010, the HP_LVL readback is only

valid within the range selected by

HP_IMPEDANCE_RANGE.

If HP_LVL reports a value outside the

selected range, then the range should be

adjusted and the measurement

repeated.

A result of 0 ohms may be reported if the

measurement is less than the minimum

value for the selected range.

R669

(029Dh)

Headphone

Detect Test

9:0

HP_DACVAL [9:0]

000h

Headphone Detect Level

(Coded as integer, LSB=1. See separate

description for full decode information.)

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