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  2. Embedded Security and 1-Wire
  3. 1-Wire Devices
  4. 1-Wire Temperature Sensors
  5. MAX31820


Overview

Features and Benefits

  • Unique 1-Wire Interface Requires Only One Port Pin for Communication
  • Each Device has a Unique 64-Bit Serial Code Stored in On-Board ROM
  • Multidrop Capability Simplifies Distributed Temperature-Sensing Applications
  • Requires No External Components
  • Can Be Powered from Data Line; 3.0V to 3.7V Power-Supply Range
  • Measures Temperatures from -55°C to +125°C (-67°F to +257°F)
  • ±0.5°C Accuracy from +10°C to +45°C
  • Thermometer Resolution is User-Selectable from 9 Bits to 12 Bits
  • Converts Temperature to 12-Bit Digital Word 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)
  • Available in 3-Pin TO-92 Package
  • TO-92 Package Allows Measurement of Ambient Temperature
  • Software Compatible with the DS1822 and DS18B20

Product Details

The MAX31820 ambient temperature sensor provides 9-bit to 12-bit Celsius temperature measurements with ±0.5°C accuracy over a +10°C to +45°C temperature range. Over its entire -55°C to +125°C operating range, the device has ±2.0°C accuracy.

The device communicates over a 1-Wire® bus that, by definition, requires only one data line (and ground) for communication with a central microprocessor. In addition, the device can derive power directly from the data line (“parasite power”), eliminating the need for an external power supply. Requiring so few pins enables the device to be placed in a 3-pin TO-92 package. The form factor of this package allows the device to be placed above the board and thus measure the ambient temperature of a system, as opposed to the board temperature that a surface-mount package would measure.

Each MAX31820 has a unique 64-bit serial code, which allows multiple MAX31820 devices to function on the same 1-Wire bus. Therefore, it is simple to use one microprocessor to control many devices distributed over a large area.

Applications

  • Any Thermally Sensitive System
  • Consumer Products
  • HVAC Environmental Controls
  • Industrial Systems
  • Process Monitoring and Control Systems
  • Temperature Monitoring Systems Inside Buildings, Equipment, or Machinery
  • Thermometers
  • Thermostatic Controls

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Documentation & Resources

  • View All (23)
  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (1)
  • Application Notes (1)
  • Design Notes (3)
  • Technical Articles (16)
  • Technical Articles

    Tools & Simulations

    IBIS Models

    Product Recommendations

    MAX31820 Companion Parts

    Recommended Related Parts

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    MAX31820MCR+ Material Declaration Reliability Data TO92
    MAX31820MCR+T Material Declaration Reliability Data TO92
    MAX31820PARMCR+ Material Declaration Reliability Data TO92
    Wafer Fabrication Data MAX31820 Reliability Data

    PCN-PDN Information

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    Support & Discussions

    MAX31820 Discussions

    RE: Max31820
    19 week(s) ago in Temperature Sensors
    RE: Max31820
    19 week(s) ago in Temperature Sensors
    RE: Max31820
    19 week(s) ago in Temperature Sensors

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