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Data Sheet

ADT7312

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TEMPERATURE

–13°C

–14°C

–15°C

–16°C

–17°C

–18°C

–19°C

–20°C

–21°C

–22°C

INT PIN

(COMPARATOR MODE)

POLARITY = ACTIVE LOW

INT PIN

(INTERRUPT MODE)

POLARITY = ACTIVE LOW

INT PIN

(INTERRUPT MODE)

POLARITY = ACTIVE HIGH

INT PIN

(COMPARATOR MODE)

POLARITY = ACTIVE HIGH

LOW + THYST

LOW

TIME

READ

Figure 19. INT Output Response to TLOW Undertemperature Events

REDUNDANT CRITICAL GENERATOR

The CT output is normally activated when the actual tempera-

ture exceeds the value stored in the TCRIT setpoint register (default

value is 147°C + THYST). To prevent the CT output from being

deactivated after the temperature exceeds 175°C, the ADT7312

incorporates a redundant standalone circuit (redundant critical

generator) to specifically control the CT output at temperatures

above 175°C.

This circuit incorporates hysteresis to ensure a safe working

temperature. Figure 20 shows the redundant critical generator

assuming control when the temperature reaches 180°C by acti-

vating the CT output; this circuit does not deactivate the CT

output until the temperature reaches 138°C. The redundant critical

generator is programmed in production to ensure that all parts

are triggered at the same temperatures (180°C and 138°C).

TEMPERATURE (°C)

138°

180°

VDD

Figure 20. CT Output Response Using the Redundant Critical Generator

Rev. A

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