TCN75 Datasheet, PDF(7/20 Page) TelCom Semiconductor, Inc – 2-WIRE SERIAL TEMPERATURE SENSOR AND THERMAL MONITOR

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TCN75 Datasheet, PDF (7/20 Pages) TelCom Semiconductor, Inc – 2-WIRE SERIAL TEMPERATURE SENSOR AND THERMAL MONITOR

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3.6 Comparator/Interrupt Modes

INT/CMPTR behaves differently depending on whether

the TCN75 is in Comparator mode or Interrupt mode.

Comparator mode is designed for simple thermostatic

operation. INT/CMPTR will go active anytime TEMP

exceeds TSET. When in Comparator mode, INT/

CMPTR will remain active until TEMP falls below

THYST, whereupon it will reset to its inactive state. The

state of INT/CMPTR is maintained in Shutdown mode

when the TCN75 is in Comparator mode. In Interrupt

mode, INT/CMPTR will remain active indefinitely, even

if TEMP falls below THYST, until any register is read via

the 2-wire bus. Interrupt mode is better suited to inter-

rupt driven microprocessor-based systems. The INT/

CMPTR output may be wire-ORâed with other interrupt

sources in such systems. Note that a pull-up resistor is

necessary on this pin since it is an open-drain output.

Entering Shutdown mode will unconditionally reset INT/

CMPTR when in Interrupt mode.

TCN75

DS21490C-page 7

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