WM8960 datasheet(45/92 Pages) WOLFSON

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Production Data

WM8960

PD, August 2013, Rev 4.2

HEADPHONE JACK DETECT

The ADCLRC/GPIO1, LINPUT3/JD2 and RINPUT3/JD3 pins can be selected as headphone jack

detect inputs to automatically disable the speaker output and enable the headphone output e.g. when

a headphone is plugged into a jack socket. In this mode, enabled by setting HPSWEN, the

headphone detect input pin switches between headphone and speaker outputs (e.g. when the pin is

connected to a mechanical switch in the headphone socket to detect plug-in). The HPSEL[1:0] bits

select the input pin used for this function. The HPSWPOL bit reverses the pin’s polarity. Note that the

LOUT1, ROUT1, SPKL and SPKR bits in register 26 must also be set for headphone and speaker

output (see Table 29 and Table 30).

TOEN must also be set to enable the clock which is used for de-bouncing the jack detect input.

TOCLKSEL selects a fast or slow de-bounce period. Note that SYSCLK must be enabled to use this

function.

When using capless mode, the OUT3CAP bit should be enabled so that OUT3 is enabled/disabled at

the same time as HP_L and HP_R to prevent pop noise.

The debounced headphone detect signal can also be output to the ADCLRC/GPIO1 pin (See GPIO

section). This function is not available when using GPIO1 as an input or as ADCLRC.

When using the ADCLRC/GPIO1 pin as a headphone detect input, the ALRCGPIO register bit needs

to be set to 1. In this mode, DACLRC is used for both ADC and DAC frame clocks. (See GPIO

section for more information)

Note:

When LINPUT3 or RINPUT3 is used as the headphone detect input, the thresholds become CMOS

levels (0.3 AVDD / 0.7 AVDD).

HPSWEN

HPSWPOL

HEADPHONE

DETECT PIN

(LINPUT3/JD2,

RINPUT3/JD3 OR

ADCLRC/GPIO1)

L/ROUT1

(AND OUT3 IN

CAPLESS MODE)

(REG. 26)

SPKL/R

(REG. 26)

HEADPHONE

ENABLED

(AND OUT3 IN

CAPLESS MODE)

SPEAKER

ENABLED

yes

Table 29 Headphone Jack Detect Operation

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R24 (18h)

Additional

Control (2)

HPSWEN

Headphone Switch Enable

0 = Headphone switch disabled

1 = Headphone switch enabled

HPSWPOL

Headphone Switch Polarity

0 = HPDETECT high = headphone

1 = HPDETECT high = speaker

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