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Применения > > MAXREFDES42#: IO-Link RTD Temp Sensor


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.

Refer to the Details tab for more information and lab measurement data. Design files and firmware can be downloaded from the Design Resources tab.

*See lab measurements.


  • IEC 61131-9
  • IQ2 IO-Link iqStackВ® 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*


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