DS18B20 是美国DALLAS 半导体公司继DS1820 之后最新推出的一种改进 型智能温度传感器。线,总线本身也可以向所挂接的DS18B20 供电,而无需额

PRELIMINARY

DS18B20

Programmable Resolution1-Wire®Digital Thermometer

Unique 1-Wire interface requires only oneport pin for communication

Multidrop capability simplifies distributedtemperature sensing applications Requires no external components

Can be powered from data line. Power supplyrange 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 programmablefrom 9 to 12 bits

Converts 12-bit temperature to digital word in750 ms (max.)

User-definable, nonvolatile temperature alarmsettings

Alarm search command identifies andaddresses devices whose temperature isoutside of programmed limits (temperaturealarm condition)

Applications include thermostatic controls,industrial systems, consumer products,thermometers, or any thermally sensitivesystem

FEATURESPIN ASSIGNMENT

DS18B20 To-92

Package

NCNC

GNDDQVD

D

VDDDQ

NCNCNCGND

DS18B20Z

8-Pin SOIC (150 mil)

PIN DESCRIPTION

GNDDQVDDNC

- Ground- Data In/Out

- Power Supply Voltage- No Connect

DESCRIPTION

The DS18B20 Digital Thermometer provides 9 to 12-bit (configurable) temperature readings whichindicate 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, andperforming temperature conversions can be derived from the data line itself with no need for an externalpower source.

Because each DS18B20 contains a unique silicon serial number, multiple DS18B20s can exist on thesame 1-Wire bus. This allows for placing temperature sensors in many different places. Applicationswhere this feature is useful include HVAC environmental controls, sensing temperatures inside buildings,equipment or machinery, and process monitoring and control.