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FM75M8X Scheda tecnica(PDF) 7 Page - Fairchild Semiconductor

Il numero della parte FM75M8X
Spiegazioni elettronici  Low-Voltage Two-Wire Digital Temperature Sensor with Thermal Alarm
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Produttore elettronici  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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© 2006 Fairchild Semiconductor Corporation
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FM75 Rev. 1.0.8
7
Comparator Mode
In comparator mode, each time a temperature-to-digital
(T-to-D) temperature conversion occurs, the new digital
temperature is compared to the value stored in the TOS
and THYST registers. If a fault tolerance number of con-
secutive temperature measurements are greater than
the value stored in the TOS register, the OS output is acti-
vated. For example, if bits F1 and F0 are equal to “10”
(fault tolerance = 4), four consecutive temperature mea-
surements must exceed TOS to activate the OS output.
Once the OS output is active, it remains active until the
first time the measured temperature drops below the
temperature stored in the THYST register. The operation
of the alarm in comparator mode with fault tolerance = 2
is illustrated in Figure 4.
Interrupt Mode
In interrupt mode, the OS output first becomes active
after a fault tolerance number of consecutive tempera-
ture measurements exceed the value stored in the TOS
register (similar to comparator mode). Once OS is active,
it can only be cleared by a user read from any of the
FM75 registers (temperature, configuration, TOS, or
THYST) or by putting the FM75 into shutdown mode (i.e.,
by setting the shutdown bit in the configuration register to
“1”). Once cleared, the OS output can only be activated
the next time by a fault tolerance number of consecutive
temperature measurements lower than the value stored
in THYST. Once it is activated, the OS output can only be
deactivated by a user read
or shutdown. In interrupt
mode, the activate/clear cycle for OS has the following
pattern: temperature > TOS, clear, temperature < THYST,
clear, temperature > TOS, clear, etc. The operation of the
alarm in interrupt mode with fault tolerance = 2 is illus-
trated in Figure 4.
Figure 4. Thermal Alarm Operation in Comparator and Interrupt Modes
For this example:
Fault Tolerance = 2
Output Polarity = Active Low
Read (or Shutdown)
T
OS
T
HYST
Temperature-to-Digital
Conversion
OS (Comparator Mode)
OS (Interrupt Mode)


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