CS47L85 datasheet(240/370 Pages) CIRRUS

240 / 370 page

CS47L85

240

Rev 4.3

the HP_LVL field, provided that the value lies within the range of the applicable HP_IMPEDANCE_RANGE setting.

Note that, for detection using one of the MICDETn pins, the HP_LVL field is the only supported readback option. The

HP_IMPEDANCE_RANGE field is not valid for detection on the MICDETn pins. See Table 91 for further description of the

HP_LVL field.

The headphone detection function is an input to the Interrupt control circuit and can be used to trigger an Interrupt event on

completion of the headphone detection -

see “Interrupts”.

The register fields associated with Headphone Detection are described in Table 91. The external circuit configuration is

illustrated in Figure 72.

Note that 32-bit register addressing is used from R12888 (3000h) upwards; 16-bit format is used otherwise. The registers

noted in Table 91 contain a mixture of 16-bit and 32-bit register addresses.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R13304

(33F8h)

OTP_HPDE

T_Cal_1

31:24

HP_OFFSET_11

[7:0]

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]

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]

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]

Headphone Detect Calibration field.

Signed number, LSB=0.25.

Range is -31.75 to +31.75.

Default value is factory-set per device.

R13306

(33FAh)

OTP_HPDE

T_Cal_2

15:8

HP_GRADIENT_

1X [7:0]

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]

Headphone Detect Calibration field.

Signed number, LSB=0.25.

Range is -31.75 to +31.75.

Default value is factory-set per device.

R659

(0293h)

Accessory_

Detect_Mod

e_1

ACCDET_SRC

Accessory Detect / Headphone Feedback pin select

0 = Accessory detect on MICDET1, Headphone ground

feedback on HPOUT1FB1

1 = Accessory detect on MICDET2, Headphone ground

feedback on HPOUT1FB2

2:0

ACCDET_MODE

[2:0]

Accessory Detect Mode Select

000 = Microphone detect (MICDETn, discrete mode)

001 = Headphone detect (HPDETL)

010 = Headphone detect (HPDETR)

011 = Reserved

100 = Headphone detect (MICDETn)

101 = Reserved

110 = Reserved

111 = Microphone detect (MICDETn, ADC mode)

Note that the MICDETn measurements are implemented on

either the MICDET1 or MICDET2 pins, depending on the

ACCDET_SRC register bit.

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