| Author | Message | | | eric | | Posted: Thu Oct 05, 2006 2:24 am Post subject: thermostat II | | | | Site Admin Joined: 01 Jan 1970 Posts: 311 | G. Kleine 044
The Type AD22105 from Analog Devices is an integrated circuit
that contains a temperature sensor, a threshold comparator with
hysteresis and an output stage. A single external resistor, RSET
allows setting the tripping threshold accurately anywhere between
–40 °C and +150 °C. The value of RSET is calculated with
RSET=39×106/(tSET+281.6)–90.3×103,
where tSET is the numerical value of the trip temperature and
RSET is in ohms. This gives values of RSET of, for instance,
47.5 kΩ for a trip temperature of 0 °C, 36 kΩ for 25 °C, and
12 kΩ for 100 °C.
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