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The LM26 is a precision, single digital-output, low-power thermostatcomprised of an internal reference, DAC, temperaturesensor and comparator. UTIlizing factory programming, it canbe manufactured with different trip points as well as differentdigital output funcTIonality. The trip point (TOS) can be presetat the factory to any temperature in the range of −55°C to+110°C in 1°C increments. The LM26 has one digital output(OS/OS/US/US), one digital input (HYST) and one analogoutput (VTEMP). The digital output stage can be preset as eitheropen-drain or push-pull. In addiTIon, it can be factoryprogrammed to be acTIve HIGH or LOW. The digital outputcan be factory programmed to indicate an over temperatureshutdown event (OS or OS) or an under temperature shutdownevent (US or US). When preset as an overtemperatureshutdown (OS) it will go LOW to indicate that the die temperatureis over the internally preset TOS and go HIGH when thetemperature goes below (TOS–THYST). Similarly, when preprogrammedas an undertemperature shutdown (US) it willgo HIGH to indicate that the temperature is below TUS and goLOW when the temperature is above (TUS+THYST). The typicalhysteresis, THYST, can be set to 2°C or 10°C and is controlledby the state of the HYST pin. A VTEMP analog output providesa voltage that is proportional to temperature and has a−10.82mV/°C output slope.
