WM9712L datasheet(32/77 Pages) WOLFSON

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WM9712L

Production Data

PD Rev 4.5 August 2006

PHONE OUTPUT (MONOOUT)

The MONOOUT output (pin 33) is intended for connection to the TX side of a wireless chipset. The

signal is generated in a dedicated mono mixer; it is not necessarily a mono mix of the stereo outputs

HPOUTL/R or LOUT2/ROUT2 (see “Audio Mixers” section).

The MONOOUT volume can be controlled by writing to register 06h. When MONOOUT is not used,

the output buffer can be disabled to save power (see “Power Management” section). The MONOOUT

pin remains at the same DC level (the reference voltage on the VREF pin), so that no click noise is

produced when muting or un-muting.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

MUTE

Mute MONOOUT

1: Mute

0: No Mute

Zero Cross Enable

0: Change gain immediately

1: Change gain only on zero crossings,

or after time-out

06h

MONOOUT

Volume

4:0

MONOOUT

VOL

00000

(0dB)

MONOOUT Volume

00000: 0dB (maximum)

00001: -1.5dB

… (1.5dB steps)

11111: -46.5dB

Table 18 MONOOUT Control

THERMAL SENSOR

The speaker and headphone outputs can drive very large currents. To protect the WM9712L 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 WM9712L 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

5Ch

ENT

Enable thermal sensor

0: Disabled

1: Enabled

54h

Thermal sensor (virtual GPIO)

1: Temperature below 150

°C

0: Temperature above 150

°C

See also “GPIO and Interrupt Control” section.

Table 19 Thermal Cutout Control

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