DS18B20

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 Thermometer resolution is programmable from 9 to 12 bits Converts 12-bit 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) Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system PRELIMINARY DS18B20 Programmable Resolution 1-Wire® Digital Thermometer PIN ASSIGNMENT DALLAS DS1820 BOTTOM VIEW 123 123 DS18B20 To-92 Package GND DQ VDD NC 1 8 NC NC 2 7 NC VDD 3 6 NC DQ 4 5 GND DS18B20Z 8-Pin SOIC (150 mil) PIN DESCRIPTION GND - Ground DQ - Data In/Out VDD - Power Supply Voltage NC - No Connect DESCRIPTION The DS18B20 Digital Thermometer provides 9 to 12-bit (configurable) temperature readings which indicate the temperature of the device. Information is sent to/from the DS18B20 over a 1-Wire interface, so that only one wire (and ground) needs to be connected from a central microprocessor to a DS18B20. Power ...