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FM75M8X Scheda tecnica(PDF) 7 Page - Fairchild Semiconductor |
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FM75M8X Scheda tecnica(HTML) 7 Page - Fairchild Semiconductor |
7 / 16 page © 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com 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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