WM8993 datasheet(162/229 Pages) WOLFSON

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WM8993

Production Data

PD, November 2010, Rev 4.0

162

THERMAL SHUTDOWN

The WM8993 incorporates a temperature sensor which detects when the device temperature is

within normal limits or if the device is approaching a hazardous temperature condition. The Temp OK

flag can be polled at any time, or output directly on the GPIO1 pin, or may be used to generate

Interrupt events.

The temperature sensor can be configured to automatically disable the audio outputs of the WM8993

in response to an overtemperature condition (approximately 150ºC).

The temperature sensor is enabled by setting the TSHUT_ENA register bit. When the

TSHUT_OPDIS is also set, then a device over-temperature condition will cause the speaker outputs

(SPKOUTL and SPKOUTR) of the WM8993 to be disabled; this response is likely to prevent any

damage to the device attributable to the large currents of the output drivers.

Note that, to prevent pops and clicks, TSHUT_ENA and TSHUT_OPDIS should only be updated

whilst the speaker and headphone outputs are disabled.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R2 (02h)

Power

Management

(2)

TSHUT_ENA

Thermal sensor enable

0 = disabled

1 = enabled

TSHUT_OPDIS

Thermal shutdown control

(Causes audio outputs to be disabled

if an overtemperature occurs. The

thermal sensor must also be enabled.)

0 = disabled

1 = enabled

Table 113 Thermal Shutdown

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