AVAILABLE

Functional Diagrams

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

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

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

FEATURES

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)

Industrial Systems, Consumer Products,

Thermometers, or Any Thermally Sensitive

System

PIN CONFIGURATIONS

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

control systems.

1-Wire is a registered trademark of Maxim Integrated Products, Inc.

TO-92

(DS18S20)

1

(BOTTOM VIEW)

2

3

MAXIM

DS1820

1

2 3

SO (150 mils)

(DS18S20Z)

N.C.

N.C.

N.C.

N.C.

GND

DQ

N.C.

6

8

7

5

3

1

2

4

19-5474; Rev 8/10

DS18S20

High-Precision 1-Wire Digital Thermometer