MAX31865
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MAX31865

RTD-to-Digital Converter

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Complete Solution Provides a Digital Temperature Reading from an RTD with Fault Detection and Input Voltage Protection

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IBIS Model MAX31865 IBIS Model Download 116.28KB
Part Models 4
1ku List Price Starting From $3.93
Features
  • Integration Lowers System Cost, Simplifies Design Efforts, and Reduces Design Cycle Time
    • Simple Conversion of Platinum RTD Resistance to Digital Value
    • Handles 100Ω to 1kΩ (at 0°C) Platinum RTDs (PT100 to PT1000)
    • Compatible with 2-, 3-, and 4-Wire Sensor Connections
    • SPI-Compatible Interface
    • 20-Pin TQFN and SSOP Packages
  • High Accuracy Facilitates Meeting Error Budgets
    • 15-Bit ADC Resolution; Nominal Temperature Resolution 0.03125°C (Varies Due to RTD Nonlinearity)
    • Total Accuracy Over All Operating Conditions: 0.5°C (0.05% of Full Scale) max
    • Fully Differential VREF Inputs
    • 21ms (max) Conversion Time
  • Integrated Fault Detection Increases System Reliability
    • ±45V Input Protection
    • Fault Detection (Open RTD Element, RTD Shorted to Out-of-Range Voltage, or Short Across RTD Element)
Additional Details
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The MAX31865 is an easy-to-use resistance-to-digital converter optimized for platinum resistance temperature detectors (RTDs). An external resistor sets the sensitivity for the RTD being used and a precision delta-sigma ADC converts the ratio of the RTD resistance to the reference resistance into digital form. The MAX31865's inputs are protected against overvoltage faults as large as ±45V. Programmable detection of RTD and cable open and short conditions is included.

Applications

  • Industrial Equipment
  • Instrumentation
  • Medical Equipment
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file View Data Sheet (Rev.3)
Documentation View All Documentation
IBIS Model MAX31865 IBIS Model Download 116.28KB
Part Models 4
1ku List Price Starting From $3.93
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MAX31865

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Data Sheet

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UPDATED 09/14/2015
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MAX31865: RTD-to-Digital Converter Data Sheet (Rev.3)

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UPDATED 04/26/2016
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MAX31865: RTD-デジタルコンバータ Data Sheet (Rev.3)

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Reliability Data

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UPDATED 01/12/2023
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MAX31865 Reliability Data redirect icon

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Design Note

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UPDATED 09/01/2017
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Design Solutions 67 - Achieve High-Accuracy Temperature Measurement in Your Precision Designs redirect icon

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UG-6041: MAXREFDES42# IO-Link RTD Temp Sensor Quick Start Guide (IQ2 IO-Link Master Version) redirect icon

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Documentation

Documentation

3rd Party Solutions 1

MIKROE-2815, Click Board, RTD Click

Device Drivers 1

MAX31865 GitHub no-OS Driver Source Code

Webcast 1

Design Considerations for IO-Link Industrial Smart Factory Sensors & Actuator

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2022-10-04

06:32

How to Measure Temperature Using RTDs and the MAX31865EVKIT

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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 Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX31865AAP+ 20-SSOP-5.3_MM external-link
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  • Material Declaration external-link
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MAX31865AAP+T 20-SSOP-5.3_MM external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
MAX31865ATP+ 20-LFCSP-5X5X0.75 external-link
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  • Material Declaration external-link
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MAX31865ATP+T 20-LFCSP-5X5X0.75 external-link
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Evaluation Kit

Evaluation Kits 2

MAX31865PMB1

Peripheral Module for the MAX31865

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MAX31865PMB1

Peripheral Module for the MAX31865

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MAX31865PMB1
Peripheral Module for the MAX31865

Features and Benefits

  • Simple Conversion of Platinum RTD Resistance to Digital Value
  • Handles 100Ω to 1kΩ (at 0°C) Platinum RTDs (PT100 to PT1000)
  • Compatible with 2-, 3-, and 4-Wire Sensor Connections
  • 6-Pin Pmod-Compatible Connector (SPI)
  • RoHS Compliant
  • Proven PCB Layout
  • Fully Assembled and Tested
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Product Detail

The MAX31865PMB1 peripheral module (Pmod™) provides the necessary hardware to interface the MAX31865 RTD-to-digital converter to any system that utilizes Pmod-compatible expansion ports configurable for SPI communication. The IC is an easy-to-use resistance-to-digital converter optimized for platinum resistance temperature detectors (RTDs). This module is set up to operate with a PT100 platinum RTD.
For full range accuracies, other RTD types, and detailed information regarding operation of the IC, refer to the MAX31865 IC data sheet.

Applications

  • Industrial Equipment
  • Instrumentation
  • Medical Equipment
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MAX31865EVKIT

Evaluation Kit for the MAX31865

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MAX31865EVKIT

Evaluation Kit for the MAX31865

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MAX31865EVKIT
Evaluation Kit for the MAX31865

Features and Benefits

  • Easy Evaluation of the MAX31865
  • Fully Assembled and Tested
  • USB HID Interface
  • EV Kit Hardware is USB Powered (USB Cable Included)
  • Windows XP®-, Windows Vista®-, and Windows® 7-Compatible Software
  • RoHS Compliant
  • Proven PCB Layout
Buy Now View Details

Product Detail

The MAX31865 evaluation kit (EV kit) provides the hardware and software (graphical user interface) necessary to evaluate the MAX31865 RTD-to-digital Converter. The EV kit includes a MAX31865ATP+ installed as well as a USB-to-SPI interface.
The USB-to-SPI master section of the EV kit can be used to interact with the MAX31865 EV kit software and exercise the device's functionality.
The evaluation kit does NOT come with an RTD. To evaluate temperature, a user-supplied RTD must be connected. This kit comes out of the box optimized for a PT1000 RTD but other value RTDs may also be evaluated with a change of the external reference resistor.

Applications

  • Industrial Equipment
  • Instrumentation
  • Medical Equipment

Evaluation Kits2

MAX31865PMB1

Peripheral Module for the MAX31865
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MAX31865EVKIT

Evaluation Kit for the MAX31865
Reference Designs

Reference Designs 2

MAXREFDES42

MAXREFDES42

IO-Link RTD Temp Sensor

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MAXREFDES42

IO-Link RTD Temp Sensor

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MAXREFDES42
IO-Link RTD Temp Sensor

Features and Benefits

Features

  • IEC 61131-9
  • IQ2 IO-Link iqStack® device
  • IO-Link version 1.1 compliant
  • Nonvolatile memory for calibration
  • Fault monitoring
  • LED display for quick bring up (coarse temp values)
  • IO-Link for fine temp values*

Competitive Advantages

  • High accuracy
  • Low power
  • Low cost
View Detailed Reference Design external link

Part Used 3

MAX14821 reference design link

MAX31865 reference design link

MAX1840 reference design link

Design & Integration Tools

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31.27 M

MAXREFDES99

MAXREFDES99

MAX7219 Display Driver Shield

Reference Designs2

MAXREFDES42

MAXREFDES42

IO-Link RTD Temp Sensor

MAXREFDES99

MAXREFDES99

MAX7219 Display Driver Shield

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