DS1821

Programmable Digital Thermostat and Thermometer
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Status Explanations for product status codes

Part Number Status
DS1821 Active: In Production. See Ordering Information for details.

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.

Data Sheet

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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
   

Key Specifications:

Temperature Sensors
Part Number Sensor Type Functions Interface Accuracy
(±°C)		 Parasite Pwr. Temp. Thresh. Temp. Resolution
(bits)		 Oper. Temp.
(°C)		 Budgetary
Price
See Notes
DS1821  Local
Standalone Thermostat
Temperature Switch/Temperature Comparator
1-Wire Non-Network
Logic
 1 No Programmable (NV) 8 -55 to +125 $2.31 @1k
See All Temperature Sensors (106)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


Temperature Switches
Part Number Switch Type Functions Interface Accuracy
(±°C)		 Temp. Thresh.
(°C)		 Features Budgetary
Price
See Notes
DS1821  Local
Standalone Thermostat
Temperature Switch/Temperature Comparator
1-Wire Non-Network
Logic
 1
Factory Programmed
Programmable
Open Drain Active Low Output
Single-Wire Interface
 $2.31 @1k
See All Temperature Switches (22)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.



Diagram

DS1821: Block Diagram
Block Diagram

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Information Index

Overview

  

Design Resources

  

Ordering Info

  

Related Products

  
Description
Key Features
Applications/Uses
Key Specifications
Diagram
Notes and Comments
  Data Sheet
Technical Documents
Evaluation Kits
Reliability Reports
Software/Models
  Price and Availability
Samples
Buy Online
Package Information
Lead-Free Information
  Similar Products by Function
Similar Products by Application
Evaluation Kits
Products with Similar Part Numbers
Products Used With This
 
Document Ref.: 19-6322 Rev 4; 2012-07-11
This page last modified: 2012-07-11