DS18B20 Datasheet | Dallas Semiconductor

FEATURES Unique 1-Wire interface requires only one port pin for munication Multidrop capability simplifies distributed temperature sensing applications Requires no external ponents 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 mand 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 Programmable Resolution 1-Wire® Digital Thermometer PIN ASSIGNMENT DALLAS DS1820 BOTTOM VIEW 123 DS18B20 To-92 Package GND DQ NC 1 8 NC NC 2 7 NC VDD 3 6 NC DQ 4 5 GND DS18B20Z 8-Pin SOIC (150 mil) PIN DESCRIPTION - 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 for reading, writing, and performing temperature conversions can be derived from the data line itself with no need for an external power source. Because each DS18B20 contains a unique silicon serial number, multiple DS18B20s can exist on the same 1-Wire bus. This allows for placing temperature sensors in many different places. Applications where this feature is useful include HVAC environmental controls, sensing temperatures inside buildings, equipment or machinery, and process monitoring and control. 1 of...