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DS1720

Dallas
Part Number DS1720
Manufacturer Dallas
Description Digital Thermometer and Thermostat
Published Aug 15, 2005
Detailed Description DS1720 PRELIMINARY DS1720 Econo – Digital Thermometer and Thermostat FEATURES PIN ASSIGNMENT DQ CLK/CONV RST GND 1 2...
Datasheet PDF File DS1720 PDF File

DS1720
DS1720

Overview
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–defined temperature TL.
TCOM is driven high when the temperature exceeds TH and stays high until the temperature falls below that of TL.
User–defined temperature settings are stored in non– volatile memory, so parts can be programmed prior to insertion in a system, as well as used in stand–alone applications without a CPU.
Temperature settings and temperature readings are all communicated to/from the DS1720 over a simple 3–wire interface.
030598 1/12 DS1720 OPERATION–MEASURING TEMPERATURE A b...


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