Maxim
›
Products
›
Sensors
›
DS1821

DS1821

Programmable Digital Thermostat and Thermometer

Data Sheet
Subscribe

Please check latest availability status for a specific part variant.

Overview

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.
DS1821: Block Diagram DS1821: Block Diagram Enlarge+

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

Design Resources

Technical Documents

Reference Schematic 5508 Create a 1-Wire Master with Xilinx PicoBlaze
Tutorial 4679 Thermal Management Handbook
App Note 4600 Simple Software Validates the Hardware CRC and Detects Errors in the Serial Bit Stream of 1-Wire® Thermal Devices
App Note 3930 Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices

Quality and Environmental Data

Product Reliability Reports: DS1821.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • DS1821C+
    •

    Quality And Environmental

    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

    Order

     
    Status:
    Package:
    Temperature:

    Related Resources

    New Products


    MAXM86161
    Single-Supply Integrated Optical Module for HR and SpO2 Measurement

    • Complete Single-Channel Optical Data Acquisition System
    • Built-In Algorithm Further Enhances Rejection of Fast Ambient Transients
    • Optimized Architecture for Reflective Heart Rate and SpO2 Monitoring

    MAX30208
    ±0.1°C Accurate, I2C Digital Temperature Sensor

    • High Accuracy and Precision
    • Low Power Consumption
    • Small Size

    Technical Docs

    Reference Designs

    Type ID Title
    Reference Circuit5508Create a 1-Wire Master with Xilinx PicoBlaze

    Events


    Electronics in Vehicles (ELIV) 2019
    10/16/2019 - 10/17/2019, Bonn, Germany
    The international VDI Congress ELIV (Electronics In Vehicles) is THE event for all experts in the field of electrical and electronical car engineering and integration of mechanical and electronical systems.

    RSVP