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FM75M8X Fiches technique(PDF) 6 Page - Fairchild Semiconductor

No de pièce FM75M8X
Description  Low Voltage 2-Wire Digital Temperature Sensor with Thermal Alarm
Download  15 Pages
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Fabricant  FAIRCHILD [Fairchild Semiconductor]
Site Internet  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FM75M8X Fiches technique(HTML) 6 Page - Fairchild Semiconductor

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FM75
PRODUCT SPECIFICATION
6
REV. 1.0.5 10/2/03
Comparator Mode
In Comparator Mode, each time a temperature-to-digital
(T-to-D) temperature conversion occurs, the new digital tem-
perature is compared to the value stored in the TOS and
THYST registers. If a fault tolerance number of consecutive
temperature measurements are greater than the value stored
in the TOS register, the O.S. output will be activated.
For example, if bits F1 and F0 are equal to “10” (fault
tolerance = 4), four consecutive temperature measurements
must exceed TOS to activate the O.S. output. Once the O.S
output is active, it will remain 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 1.
Interrupt Mode
In Interrupt Mode the O.S. output will first become active
after a fault tolerance number of consecutive temperature
measurements exceed the value stored in the TOS register
(similar to Comparator Mode). Once O.S. 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 O.S. output can only be activated the next time
by a fault tolerance number of consecutive temperature
measurements that are lower than the value stored in THYST.
Again, once it is activated the O.S. output can only be
deactivated by a user read or shutdown. Thus, in Interrupt
Mode the activate/clear cycle for O.S. 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 also
illustrated in Figure 1.
Figure 1. 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
O.S. (Comparator Mode)
O.S. (Interrupt Mode)


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