TCN75 View Datasheet(PDF) - Microchip Technology
Part Name
Description
MFG CO.
'TCN75' PDF : 20 Pages View PDF
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-OR’ed 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
© 2006 Microchip Technology Inc.
DS21490C-page 7
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