CS47L35 datasheet(161/300 Pages) CIRRUS

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DS1085F3

161

CS47L35

4.12 External Accessory Detection

Table 4-80. Headphone Detect Control

Bit

Label

Default

Description

R12792 (0x31F8)

OTP_HPDET_Cal_

31:24 HP_OFFSET_

11[7:0]

See

Footnote 1

Headphone Detect Calibration field.

Signed number, LSB = 0.25.

Range is –31.75 to +31.75.

Default value is factory-set per device.

23:16 HP_OFFSET_

10[7:0]

See

Footnote 1

Headphone Detect Calibration field.

Signed number, LSB = 0.25.

Range is –31.75 to +31.75.

Default value is factory-set per device.

15:8 HP_OFFSET_

01[7:0]

See

Footnote 1

Headphone Detect Calibration field.

Signed number, LSB = 0.25.

Range is –31.75 to +31.75.

Default value is factory-set per device.

7:0 HP_OFFSET_

00[7:0]

See

Footnote 1

Headphone Detect Calibration field.

Signed number, LSB = 0.25.

Range is –31.75 to +31.75.

Default value is factory-set per device.

R12794 (0x31FA)

OTP_HPDET_Cal_

15:8 HP_

GRADIENT_

1X[7:0]

See

Footnote 1

Headphone Detect Calibration field.

Signed number, LSB = 0.25.

Range is –31.75 to +31.75.

Default value is factory-set per device.

7:0 HP_

GRADIENT_

0X[7:0]

See

Footnote 1

Headphone Detect Calibration field.

Signed number, LSB = 0.25.

Range is –31.75 to +31.75.

Default value is factory-set per device.

R659 (0x0293)

Accessory_Detect_

Mode_1

ACCDET_

SRC

Accessory Detect/Headphone Feedback pin select

0 = Accessory detect on MICDET1, Headphone ground feedback on HPOUTFB1

1 = Accessory detect on MICDET2, Headphone ground feedback on HPOUTFB2

2:0 ACCDET_

MODE[2:0]

Accessory Detect Mode Select.

000 = Mic detect (MICDETn, discrete mode)

001 = Headphone detect (HPDETL)

010 = Headphone detect (HPDETR)

011 = Reserved

100 = Headphone detect (MICDETn)

101–110 = Reserved

111 = Mic detect (MICDETn, ADC

mode)

Note that the MICDETn measurements are implemented on either the MICDET1 or

MICDET2 pins, depending on the ACCDET_SRC bit

R667 (0x029B)

Headphone_

Detect_1

10:9 HP_

IMPEDANCE_

RANGE[1:0]

Headphone Detect Range

00 = 4

 to 30 

01 = 8

 to 100 

10 = 100

 to 1 k

11 = 1 k

 to 10 k

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 gives a slower measurement

time.)

00 = 32 kHz

01 = 16 kHz

10 = 8 kHz

11 = 4 kHz

2:1 HP_RATE[1:0]

Headphone Detect Sweep Rate

(Selects the step size between successive measurements. Increasing the step size

gives a faster measurement time.)

00 = 1

01 = 2

10 = 4

11 = Reserved

HP_POLL

Headphone Detect Enable

Write 1 to start HP Detect function

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