wm8953 Wolfson Microelectronics plc, wm8953 Datasheet - Page 47

• Manufacturer Part Number: wm8953
• Description: Low Power Stereo Adc With Pll And Tdm Interface Low Power Stereo Adc With Pll And Tdm Interface
• Manufacturer: Wolfson Microelectronics plc

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Production Data
TEMPERATURE SENSOR OUTPUT
To protect the device from overheating a thermal shutdown function is provided (see "Thermal
Shutdown" section for more information).
The polarity of the Thermal Shutdown sensor may be controlled by register bit TEMPOK_POL. Note
that this polarity inversion bit applies to the Interrupt register behaviour only; it does not affect the
direct GPIO output of the Temperature Sensor function. The associated interrupt event may be
masked or enabled by register bit TEMPOK_IRQ_ENA. The Temperature status bit contained in the
IRQ Register (R18) may be read at any time or else in response to an Interrupt event. See Table 30
for more details of the Interrupt function.
If direct output of the Temperature status bit is required to the external pins of the WM8953, the
following register settings are required:
The register fields used to configure the Temperature Sensor GPIO function are described in Table
26.
Table 26 Temperature Sensor GPIO Control
The temperature sensor function operates according to the following truth table:
Table 27 Truth Table for GPIO Output of Temperature Sensor Function
REGISTER
ADDRESS
R23 (17h)
R22 (16h)
Temperature Sensor output
Temperature Sensor output
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AIF_TRIS = 0
GPIOn_SEL = 0101 for the selected GPIO Temperature status output pin
GPIOn_PU = 0 for the selected GPIO Temperature status output pin
GPIOn_PD = 0 for the selected GPIO Temperature status output pin
LABEL
11
11
BIT
TEMPOK_POL
(rw)
TEMPOK_IRQ_
ENA
LABEL
VALUE
0
1
1b
0b
DEFAULT
Overheat temperature exceeded
Overheat temperature not exceeded
Temperature Sensor polarity
0 = Non-inverted
1 = Inverted
Temperature Sensor IRQ Enable
0 = disabled
1 = enabled
DESCRIPTION
DESCRIPTION
PD, January 2009, Rev 4.0
WM8953
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