MAX31865

RTD-to-Digital Converter

Complete Solution Provides a Digital Temperature Reading from an RTD with Fault Detection and Input Voltage Protection
 Overview   Design Resources   Ordering Info   Related Products   User Comments (1)   All   

Status Explanations for product status codes

Active: In Production.

Description

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 ±50V. Programmable detection of RTD and cable open and short conditions is included.

Data Sheet

Download this datasheet in PDF formatDownload Rev 0 (PDF, 1.3MB)
Send this datasheet to any email addressEmail

My Maxim: Not Logged In
By logging in to My Maxim you can subscribe to alerts for this data sheet.

Login | Register
An evaluation kit is available: MAX31865EVKIT

NOTE: This product uses the following:
MAX31865EVKitSoftwareInstall

Key Features

  • 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
  • Conversion Time: 21ms max
  • 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
  • ±50V Input Protection
  • Fully Differential VREF Inputs
  • Fault Detection (Open RTD Element, RTD Shorted to Out-of-Range Voltage, or Short Across RTD Element)
  • SPI-Compatible Interface
  • 20-Pin TQFN Package
 

Applications/Uses

  • Industrial Equipment
  • Instrumentation
  • Medical Equipment
   

Key Specifications:

Temperature Sensors
Part Number Sensor Type Functions Interface Remote Chan. Accuracy
(±°C)		 Parasite Pwr. Temp. Resolution
(bits)		 Oper. Temp.
(°C)		 Budgetary
Price
See Notes
MAX31865  Remote RTD-to-Digital Converter SPI Single 0.5 No 15 -40 to +125 $3.00 @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.



Diagram

MAX31865: Typical Application Circuit
Typical Application Circuit

More Information

New Product Press Release   [ 2012-09-20 ] [ 2012-09-20 ]

Didn't Find What You Need?

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.: 19-6478 Rev 0; 2012-10-05
This page last modified: 2013-02-14