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Temp sensor ref design for industrial control, automation

27 Mar 2015

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Maxim Integrated Products Inc. rolled out a temperature sensor reference design (RD) that promises to allow designers to save power, cost and space. Aimed at industrial control and automation, the MAXREFDES42# IO-Link boasts a highly integrated analogue front end (AFE) that measures temperature, while detecting overvoltage, shorts and open circuits. This is a set of capabilities not found in competitive discrete solutions, added the company.

According to Maxim, the reference design consumes minimal power and provides better than ±0.5°C accuracy. The temperature appears immediately on an LED display for a quick and convenient snapshot of coarse temperature values. For user convenience, MAXREFDES42# fits in a standard industrial form factor. For versatility, it supports all three IO-Link speeds. The MAXREFDES42# is available for use with a 2-wire, 3-wire or 4-wire PT100 RTD over a wide temperature range. Applications include food and chemical processing, textile production, and air, gas and liquid temperature measurement.


The configuration software for this smart IO-Link temperature detector was developed in collaboration with IQ2 Development. The MAXREFDES42# uses their IO-Link device stack to communicate with any IO-Link version 1.1-compliant master. This software control lowers operating cost because it enables fast set-up, diagnosis and event monitoring from a PC and without a trip to the installation site. Maintenance can be done at the PC and not on the floor.

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 sensor performs accurate temperature conversions to 15bit resolution with multiple fault detection features. A display shows coarse temperatures rounded to the nearest degree-Celsius, while the IO-Link communication tracks and provides fine temperature values, detailed the company.

During operation over a temperature range of -40°C to 150°C, the system consumes less than 300mW of power by using an industrial DC-DC step-down converter. In addition, integrated into the front-end is the MAX31865 RTD-to-digital converter that claims to offer flexibility, robustness and optimal performance for an IO-Link platform. The PC control with IQ2 software also saves configuration and maintenance cost and increases uptime.

The MAXREFDES42# reference design is available for $99.

MAXREFDES42# reference design diagram

MAXREFDES42# reference design diagram

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