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DS18S20

High-Precision 1-Wire Digital Thermometer

Maxim Integrated 

AVAILABLE

DS18S20

High-Precision 1-Wire Digital Thermometer

FEATURES

 Unique 1-Wire® Interface Requires Only One

Port Pin for Communication

 Each Device has a Unique 64-Bit Serial Code

Stored in an On-Board ROM

 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

 Measures Temperatures from -55°C to

+125°C (-67°F to +257°F)

 ±0.5°C Accuracy from -10°C to +85°C

 9-Bit Thermometer Resolution

 Converts Temperature in 750ms (max)

 User-Definable Nonvolatile (NV) Alarm

Settings

 Alarm Search Command Identifies and

Addresses Devices Whose Temperature is

Outside Programmed Limits (Temperature

Alarm Condition)

 Applications Include Thermostatic Controls,

Industrial Systems, Consumer Products,

Thermometers, or FAunynTchteiromnaallly DSeinasgitirvaems

System

PIN CONFIGURATIONS

MAXIM

DS1820

123

N.C. 1

N.C. 2

VDD

3

DQ 4

8 N.C.

7 N.C.

6 N.C.

5 GND

SO (150 mils)

(DS18S20Z)

12 3

(BOTTOM VIEW)

TO-92

(DS18S20)

DESCRIPTION

The DS18S20 digital thermometer provides 9-bit Celsius temperature measurements and has an alarm

function with nonvolatile user-programmable upper and lower trigger points. The DS18S20

communicates over a 1-Wire bus that by definition requires only one data line (and ground) for

communication with a central microprocessor. It has an operating temperature range of –55°C to +125°C

and is accurate to ±0.5°C over the range of –10°C to +85°C. In addition, the DS18S20 can derive power

directly from the data line (“parasite power”), eliminating the need for an external power supply.

Each DS18S20 has a unique 64-bit serial code, which allows multiple DS18S20s to function on the same

1-Wire bus. Thus, it is simple to use one microprocessor to control many DS18S20s distributed over a

large area. Applications that can benefit from this feature include HVAC environmental controls,

temperature monitoring systems inside buildings, equipment, or machinery, and process monitoring and

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Functional Diagrams continued at end of data sheet.

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For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

19-5474; Rev 8/10

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