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.

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