MAXREFDES42#: RTD Temperature Sensing, IO-Link


The MAXREFDES42# is a high-accuracy IO-Link® resistance temperature detector (RTD) temperature sensor reference design for use with a 2-wire, 3-wire, or 4-wire PT100 RTD over a wide temperature range. Built in an industrial form factor, the design makes use of Maxim Integrated’s highly integrated MAX31865 RTD-to-digital converter.

A rugged, on-board female M12 connector allows off-the-shelf RTDs to be connected to the board using a standard M12 extension cable. The temp sensor performs accurate temperature conversions to 15-bit resolution with multiple fault detection features.

A display shows coarse temperatures rounded to the nearest °C, while the IO-Link communication tracks and provides fine temperature values. This sensor utilizes IQ2 Development’s IO-Link device stack to communicate to any IO-Link version 1.1-compliant master.

By utilizing an industrial DC-DC step-down converter, this reference design consumes minimal power.

The board also contains a male M12 connector for connection to a compliant IO-Link master using a standard M12 cable. Connecting the MAXREFDES42# to a USB IO-link master such as the IQ2 Development iqInterface® IO-Link master, using their iqTool® software, allows for evaluation with a PC.


Manufacturer Maxim Integrated
Category Sensor Solutions
Sub-Category Temperature Sensing
Eval Board Part Number MAXREFDES42#-ND
Eval Board Supplier Maxim Integrated
Eval Board Normally In Stock
Purpose RTD (Resistive Temperature Detector)
Sensing Method RTD, External
Accuracy ±0.5°C
Sensing Range - Not Given
Features Fault monitoring
IO-Link (IEC 61131-9)
Local LED display
Non-volatile memory
Design Author Maxim Integrated Products
Main I.C. Base Part MAX14821
Component Count + Extras 51 + 6
Date Created By Author 2014-12
Date Added To Library 2017-05

Eval Board

Order a fully assembled board:

Quantity Available: 1