MAX31725(2012) Ver la hoja de datos (PDF) - Maxim Integrated
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MAX31725 Datasheet PDF : 15 Pages
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MAX31725
±0.5°C Local Temperature Sensor
Detailed Description
The MAX31725 temperature sensor measures temperature
and converts the data into digital form. An I2C-compatible
two-wire serial interface allows access to conversion
results. The device accepts standard I2C commands
to read the data, set the overtemperature alarm (OS)
trip thresholds, and configure other characteristics.
While reading the temperature register, any changes in
temperature are ignored until the read is completed. The
temperature register is updated for the new temperature
measurement upon completion of the read operation.
OS Output, TOS and THYST Limits
In comparator mode, the OS output behaves like a
thermostat (Figure 2). The output asserts when the
temperature rises above the limit set in the TOS register.
The output deasserts when the temperature falls below
the limit set in the THYST register. In comparator mode,
the OS output can be used to turn on a cooling fan,
initiate an emergency shutdown signal, or reduce system
clock speed.
In interrupt mode, exceeding TOS also asserts OS. OS
remains asserted until a read operation is performed
on any of the registers. Once OS has asserted due to
TEMPERATURE
TOS
THYST
INACTIVE
OS OUTPUT
(COMPARATOR MODE)
OS SET ACTIVE LOW
ACTIVE
INACTIVE
OS OUTPUT
(INTERRUPT MODE)
OS SET ACTIVE LOW
ACTIVE
Figure 2. OS Output Temperature Response Diagram
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