Introduction

This is the latest DS18B20 1-Wire digital temperature sensor from Dallas. The DS18B20 Digital Thermometer provides 9 to 12-bit (configurable) temperature readings which indicate the temperature of the device.

 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.

Features

Unique 1-Wire interface requires only one port pin for communication

Multi drop 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

Resource

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