WM9090ECSSLASHR datasheet(55/81 Pages) WOLFSON

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Production Data

WM9090

PD, November 2010, Rev 4.1

THERMAL SHUTDOWN

The WM9090 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 temperature status can be polled at any time by reading the TSHUT register bit. The

temperature sensor can be configured to automatically disable the audio outputs of the WM9090 in

response to an over-temperature 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 output

(SPKOUTP and SPKOUTN) to be disabled; this response is likely to prevent any damage to the

device attributable to the large currents of the speaker output driver.

When the temperature sensor is enabled, the temperature status can be read from the TSHUT

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

(read only)

Thermal shutdown status

0 = Normal temperature

1 = Over temperature

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 33 Thermal Shutdown

SOFTWARE RESET AND CHIP ID

A Software Reset can be commanded by writing to Register R0. This is a read-only register field and

the contents will not be affected by writing to this Register.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R0 (00h)

Software

Reset

15:0

SW_RESET

[15:0]

Writing to this register causes a

Software Reset.

Table 34 Chip Reset and ID

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