CS47L85 datasheet(241/370 Pages) CIRRUS

241 / 370 page

CS47L85

Rev 4.3

241

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R667

(029Bh)

Headphone

_Detect_1

10:9

HP_IMPEDANCE

_RANGE [1:0]

Headphone Detect Range

00 = 4 ohms to 30 ohms

01 = 8 ohms to 100 ohms

10 = 100 ohms to 1k ohms

11 = 1k ohms to 10k ohms

Only valid when ACCDET_MODE=001 or

ACCDET_MODE=010.

4:3

HP_CLK_DIV

[1:0]

Headphone Detect Clock Rate

(Selects the clocking rate of the headphone detect

adjustable current source. Decreasing the clock rate will

give a slower measurement time.)

00 = 32kHz

01 = 16kHz

10 = 8kHz

11 = 4kHz

2:1

HP_RATE [1:0]

Headphone Detect Sweep Rate

(Selects the step size between successive measurements.

Increasing the step size will give a faster measurement

time.)

00 = 1

01 = 2

10 = 4

11 = Reserved

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_3

9:0

HP_DACVAL [9:0]

000h

Headphone Detect Level

(Coded as integer, LSB=1. See separate description for full

decode information.)

R671

(029Fh)

Headphone

_Detect_5

9:0

HP_DACVAL_DO

WN [9:0]

000h

Headphone Detect Level

(Coded as integer, LSB=1. See separate description for full

decode information.)

Table 91 Headphone Detect Control

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