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050400

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

PIN ASSIGNMENT

PIN DESCRIPTION

GND - Ground

DQ

- Data In/Out

- 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.

DS18B20

Programmable Resolution

1-Wire

www.dalsemi.com

PRELIMINARY

DALLAS

DS1820

1 2 3

1 2 3

BOTTOM VIEW

DS18B20 To-92

Package

1

2

3

4

8

7

6

5

NC

NC

NC

GND

NC

NC

DQ

DS18B20Z

8-Pin SOIC (150 mil)