DS1820

DS1820 DS1820 1–WireTM Digital Thermometer FEATURES PIN ASSIGNMENT DALLAS DALLAS DS2434 DS1820 1 2 3 Unique 1–WireTM interface requires only one port pin for communication Multidrop capability simplifies distributed temperature sensing applications Requires no external components Can be powered from data line Zero standby power required 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 BOTTOM VIEW 1 2 3 Temperature is read as a 9–bit digital value. Converts temperature to digital word in 200 ms (typ.) User–definable, tings nonvolatile temperature alarm set- DS1820 PR35 PACKAGE See Mech. Drawings Section GND DQ VDD NC NC NC NC NC NC VDD DQ 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 NC NC NC NC NC NC NC GND DS1820S 16–PIN SSOP See Mech. Drawings Section Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition) systems, consumer products, thermometers, or any thermally sensitive system PIN DESCRIPTION GND DQ VDD NC – – – – Ground Data In/Out Optional VDD No Connect Applications include thermostatic controls, industrial DESCRIPTION The DS1820 Digital Thermometer provides 9–bit temperature readings which indicate the temperature of the device. Information is sent to/from the DS1820 over a 1–Wire interface, so that only one wire (and ground) needs to be connected from a central microprocessor to...