The LM26 is a precision, single digital-output, low-power thermostat
comprised of an internal reference, DAC, temperature
sensor and comparator. Utilizing factory programming, it can
be manufactured with different trip points as well as different
digital output functionality. The trip point (TOS) can be preset
at 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 analog
output (VTEMP). The digital output stage can be preset as either
open-drain or push-pull. In addition, it can be factory
programmed to be active HIGH or LOW. The digital output
can be factory programmed to indicate an over temperature
shutdown event (OS or OS) or an under temperature shutdown
event (US or US). When preset as an overtemperature
shutdown (OS) it will go LOW to indicate that the die temperature
is over the internally preset TOS and go HIGH when the
temperature goes below (TOS–THYST). Similarly, when preprogrammed
as an undertemperature shutdown (US) it will
go HIGH to indicate that the temperature is below TUS and go
LOW when the temperature is above (TUS+THYST). The typical
hysteresis, THYST, can be set to 2°C or 10°C and is controlled
by the state of the HYST pin. A VTEMP analog output provides
a voltage that is proportional to temperature and has a
?10.82mV/°C output slope.