Top

Programmable Digital Thermostat and Thermometer

Product Details

The DS1821 can function as a standalone thermostat with user-programmable trip-points or as 8-bit temperature sensor with a 1-Wire® digital interface. The thermostat trip-points are stored in nonvolatile memory, so DS1821 units can be programmed prior to system insertion for true standalone operation. The DS1821 has an operating temperature range of –55°C to +125°C and is accurate to ±1°C over a range of 0°C to +85°C. Communication with the DS1821 is accomplished through the open-drain DQ pin; this pin also serves as the thermostat output.

Key Features

  • Requires no external components
  • Unique 1-Wire interface requires only one port pin for communication
  • Operates over a -55°C to +125°C (-67°F to +257°F) temperature range
  • Functions as a standalone thermostat with user-definable trip-points
  • Provides 8-bit (1°C resolution) centigrade temperature measurements
  • Accuracy is ±1°C over 0°C to +85°C range
  • Converts temperature to a digital word in 1 second (max)
  • Available in 3-pin TO92 and 8-pin SO packages
  • Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system

Applications/Uses

  • Consumer Products
  • Industrial Systems
  • Thermometers
  • Thermostatic Controls

Simplified Block Diagram

DS1821: Block Diagram DS1821: Block Diagram Zoom icon

Technical Docs

Design & Development

Click any title below to view the detail page where available.

/en/design/design-tools/ee-sim.html?

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal

Parameters

Key Features

  • Requires no external components
  • Unique 1-Wire interface requires only one port pin for communication
  • Operates over a -55°C to +125°C (-67°F to +257°F) temperature range
  • Functions as a standalone thermostat with user-definable trip-points
  • Provides 8-bit (1°C resolution) centigrade temperature measurements
  • Accuracy is ±1°C over 0°C to +85°C range
  • Converts temperature to a digital word in 1 second (max)
  • Available in 3-pin TO92 and 8-pin SO packages
  • Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system

Applications/Uses

  • Consumer Products
  • Industrial Systems
  • Thermometers
  • Thermostatic Controls

Description

The DS1821 can function as a standalone thermostat with user-programmable trip-points or as 8-bit temperature sensor with a 1-Wire® digital interface. The thermostat trip-points are stored in nonvolatile memory, so DS1821 units can be programmed prior to system insertion for true standalone operation. The DS1821 has an operating temperature range of –55°C to +125°C and is accurate to ±1°C over a range of 0°C to +85°C. Communication with the DS1821 is accomplished through the open-drain DQ pin; this pin also serves as the thermostat output.

Simplified Block Diagram

DS1821: Block Diagram DS1821: Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal