DS18S20

PRELIMINARY DS18S20 High Precision ® 1-Wire Digital Thermometer www.dalsemi.com FEATURES Unique 1–Wire 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. Power supply range is 3.0V to 5.5V Zero standby power required Measures temperatures from –55°C to +125°C. Fahrenheit equivalent is –67°F to +257°F ±0.5°C accuracy from –10°C to +85°C Temperature is read as a 9–bit digital value Converts temperature to digital word in 750 ms (max.) User–definable, nonvolatile temperature alarm settings Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition) Functionally compatible with DS1820 1-Wire digital thermometer Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system PIN ASSIGNMENT BOTTOM VIEW DALLAS DS18S20 1 2 3 1 2 3 DS18S20 To-92 Package NC NC GND DQ VDD VDD DQ 1 2 3 4 8 7 6 5 NC NC NC GND DS18S20Z 8-Pin SOIC (150 mil) PIN DESCRIPTION GND DQ VDD NC Ground Data In/Out Power Supply Voltage No Connect DESCRIPTION The DS18S20 Digital Thermometer provides 9–bit temperature readings which indicate the temperature of the device. Information is sent to/from the DS18S20 over a 1–Wire interface, so that only one wire (and ground) needs to be connected from a central microprocessor to a DS18S...