WM9712CLGEFLSLASHV datasheet(33/78 Pages) WOLFSON

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Production Data

WM9712L

PD, Rev 4.6, November 2011

JACK INSERTION AND AUTO-SWITCHING

In a phone application, a BTL ear speaker may be connected across OUT3 and HPOUTL, and a

stereo headphone on HPOUTL and HPOUTR. Typically, only one of these two output devices is used

at any given time: when no headphone is plugged in, the BTL ear speaker is active, otherwise the

headphone is used.

The presence of a headphone can be detected using GPIO1 (pin 44) and an external pull-up resistor

(see “Applications Information” section for a circuit diagram). When the jack is inserted GPIO1 is

pulled low by a switch on the socket. When the jack is removed GPIO1 is pulled high by a resistor. If

the JIEN bit is set, the WM9712L automatically switches between headphone and ear speaker, as

shown below.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

58h

Additional

Functional

Control

JIEN

Jack Insert Enable – Takes output of GPIO1

logic

FRC

Force Ear Speaker Mode

See table below

Table 20 Jack Insertion / Auto-Switching (1)

JIEN

FRC

GPIO1 MODE DESCRIPTION

Jack insert detection disabled

(headphone and ear speaker

can be used at the same

time)

Set by

reg.

24h

and

26h

Jack insert detection enabled,

headphone plugged in

Jack insert detection enabled,

headphone not plugged in

Set by

reg.

24h

and

26h

Set by

reg.

16h

Force Ear Speaker Mode

Invalid; do not use this setting

Table 21 Jack Insertion / Auto-Switching (2)

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