WM5102 datasheet(188/334 Pages) WOLFSON

188 / 334 page

WM5102

Production Data

PD, June 2014, Rev 4.2

188

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R668

(029Ch)

Headphone

Detect 2

HP_DONE

Headphone Detect Status

0 = HP Detect not complete

1 = HP Detect done

R671

(029Fh)

Headphone

Detect Test

9:0

HP_DACVAL [9:0]

000h

Headphone Detect Level

(see separate description for decode)

Table 79 Headphone Detect Control

Figure 66 Headphone Detect Interface

The external connections for the Headphone Detect circuit are illustrated in Figure 66. Note that only

the HPOUT1L or HPOUT1R headphone outputs should be connected to HPDETL or HPDETR pins -

impedance measurement is not supported on HPOUT2L, HPOUT2R, EPOUTP or EPOUTN.

Note that, where external resistors are connected in series with the headphone load, as illustrated, it

is recommended that the HPDETn connection is to the headphone side of the resistors. If the

HPDETn connection is made to the WM5102 ‘end’ of these resistors, this will lead to a corresponding

offset in the measured impedance.

Note that the measurement accuracy of the headphone detect function may be up to +/-30%.

Under default conditions, the measurement time varies between 17ms and 61ms according to the

impedance of the external load. A high impedance will be measured faster than a low impedance.

WM5102 Datasheet(PDF) 188 Page - Wolfson Microelectronics plc