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FM75M8X Fiches technique(PDF) 6 Page - Fairchild Semiconductor |
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FM75M8X Fiches technique(HTML) 6 Page - Fairchild Semiconductor |
6 / 15 page 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) |
Numéro de pièce similaire - FM75M8X |
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Description similaire - FM75M8X |
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