WM9713LGEFLSLASHV datasheet(53/108 Pages) WOLFSON

53 / 108 page

Pre-Production

WM9713L

PP Rev 3.0 June 2006

JACK INSERTION AND AUTO-SWITCHING

In a phone application, a BTL ear speaker may be connected across MONO and HPL, a stereo

headphone on HPL and HPR and stereo speakers on SPKL, SPKR, OUT3 and OUT4 (see Figure

15). Typically, only one of these three output devices is used at any given time: when no headphone

is plugged in, the BTL ear speaker or stereo speakers are active, otherwise the headphone is used.

Figure 15 Typical Output Configuration

The presence of a headphone can be detected using one of GPIO1/6/7/8 (pins 44, 3, 11 & 12) and

an external pull-up resistor (see Figure 41, page 103 for a circuit diagram). When the jack is inserted,

the GPIO is pulled low by a switch on the socket. When the jack is removed the GPIO is pulled high

by a resistor. If the JIEN bit is set, the WM9713L automatically switches between headphone and

any other output configuration, typically ear speaker or stereo speaker that has been set up in the

Powerdown and Output PGA Mux Select registers.

Note:

Please refer to WAN_0182 for further information on jack detect configuration.

In addition to the typical configuration explained above, the WM9713L can also support automatic

switching between the following three configurations set as BTL ear speaker and headphone.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

24h

Output Volume

Mapping (Jack

Insert)

1:0

EARSPKSEL

00: Default, no ear speaker

configuration selected.

01: MONO and HPL driver selected as

BTL ear speaker.

10: OUT3 and HPL driver selected as

BTL ear speaker.

11: OUT4 and HPL driver selected as

BTL ear speaker.

Table 41 Ear Speaker Configuration

For example if OUT4 and HPL is selected as the BTL ear speaker, the user should select

EARSPKSEL = 3h, then OUT4 is tri-stated on jack insert to prevent sound across the ear speaker

during headphone operation and HPL volume is set to OUT4 volume on jack out to ensure correct

ear speaker operation. It should be noted that all other outputs except HPL, HPR and selected ear

speaker driver are disabled and internally connected to VREF on jack insert. This maintains VREF at

those outputs and helps prevent pops when the outputs are enabled.

WM9713LGEFL/V Datasheet(PDF) 53 Page - Wolfson Microelectronics plc

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