wm9081 Wolfson Microelectronics plc, wm9081 Datasheet - Page 74

• Manufacturer Part Number: wm9081
• Description: Mono Dac With 2.6w Class Ab/d Speaker Driver, Dynamic Range Controller And Retune Mobile Parametric Equalizer
• Manufacturer: Wolfson Microelectronics plc

WM9081
THERMAL SHUTDOWN
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The WM9081 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_SHUT flag can be polled at any time to determine the temperature status. The temperature
status can also be indicated via the IRQ
The temperature sensor is configured by default to automatically disable the audio outputs of the
WM9081 in response to an over-temperature condition.
The temperature sensor is enabled when the TSENSE_ENA register bit is set. When the
TSHUT_ENA bit is also set, then a device over-temperature condition will cause the speaker output
to be disabled; this response is intended to prevent any damage to the device attributable to the
large currents of the output drivers.
See “Interrupts” for details of hardware output of the Temperature Sensor status via the IRQ
Table 44 Thermal Shutdown
R11 (0Bh)
Power
Management
REGISTER
ADDRESS
BIT
8
7
6
TSHUT_ENA
TSENSE_ENA
TEMP_SHUT
LABEL
¯ ¯ ¯ pin.
DEFAULT
1
1
0
Thermal shutdown control
(Causes audio outputs to be disabled
if an over-temperature occurs. The
thermal sensor must also be enabled.)
0 = Disabled
1 = Enabled
Thermal sensor enable
0 = Disabled
1 = Enabled
Thermal Sensor status (Read Only)
0 = Temperature limit not exceeded
1 = Temperature limit exceeded
DESCRIPTION
PP, Rev 3.0, April 2009
Pre-Production
¯ ¯ ¯ pin.
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