DS1720

DS1720 PRELIMINARY DS1720 Econo – Digital Thermometer and Thermostat FEATURES PIN ASSIGNMENT DQ CLK/CONV RST GND 1 2 3 4 8 7 6 5 VDD THIGH TLOW TCOM Requires no external components Supply voltage range covers from 2.7V to 5.5V Measures temperatures from –55°C to +125°C in 0.5°C increments. Fahrenheit equivalent is –67°F to +257°F in 0.9°F increments Temperature is read as a 9–bit value Converts (max) temperature to digital word in 1 second DQ CLK/CONV DS1720S 8–PIN SOIC (208 MIL) See Mech Drawings Section PIN DESCRIPTION – 3–Wire Input/Output – 3–Wire Clock Input and Stand–alone Convert Input – 3–Wire Reset Input – Ground – High Temperature Trigger – Low Temperature Trigger – High/Low Combination Trigger – Power Supply Voltage (3V – 5V) Thermostatic settings are user–definable and non– volatile Data is read from/written via a 3–wire serial interface (CLK, DQ, RST) Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system 8–pin SOIC (208 mil) package RST GND THIGH TLOW TCOM VDD DESCRIPTION The DS1720 Digital Thermometer and Thermostat provides 9–bit temperature readings which indicate the temperature of the device. With three thermal alarm outputs, the DS1720 can also act as a thermostat. THIGH is driven high if the DS1720’s temperature is greater than or equal to a user–defined temperature TH. TLOW is driven high if the DS1720’s temperature is less than or equal to a user–...