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

Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
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
Part Models 4
1ku List Price Starting From $3.93

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX31865AAP+
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MAX31865AAP+T
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MAX31865ATP+
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MAX31865ATP+T
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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

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

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

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

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
Reference Designs

Reference Designs 2

MAXREFDES99

MAX7219 Display Driver Shield

MAXREFDES42

IO-Link RTD Temp Sensor

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MAXREFDES42

IO-Link RTD Temp Sensor

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

Design & Integration Tools

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