WM9713 datasheet(54/111 Pages) WOLFSON

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WM9713L

Preliminary Technical Data

PTD, March 2004, Rev 2.2

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

MU4

1 (Mute)

Mute OUT4

1: Mute (OFF)

0: No Mute (ON)

ZC4

OUT4 zero cross enable

0: Change gain immediately

1: Change gain only on zero crossings,

or after time-out

13:8

OUT4VOL

000000

(0dB)

OUT4 Volume

000000: 0dB (maximum)

000001: -1.5dB

… (1.5dB steps)

011111: -46.5dB

1xxxxx: -46.5dB

MU3

1 (Mute)

Mute OUT3

1: Mute (OFF)

0: No Mute (ON)

ZC3

OUT3 zero cross enable

0: Change gain immediately

1: Change gain only on zero crossings,

or after time-out

06h

Speaker

Volume

5:0

OUT3VOL

00000

(0dB)

OUT3 Volume

Similar to OUT4VOL

Table 38 OUT3 / OUT4 PGA Control

THERMAL SENSOR

The speaker and headphone outputs can drive very large currents. To protect the WM9713L from

becoming too hot, a thermal sensor has been built in. If the chip temperature reaches approximately

150

°C, and the ENT bit is set, the WM9713L deasserts GPIO bit 11 in register 54h, a virtual GPIO

that can be set up to generate an interrupt to the CPU (see “GPIO and Interrupt Control” section).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

3Ch

TSHUT

Power down thermal sensor

0: Enabled

1: Disabled

54h

Thermal sensor (virtual GPIO)

1: Temperature below 150

°C

0: Temperature above 150

°C

See also “GPIO and Interrupt Control” section.

Table 39 Thermal Cutout Control

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.

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