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Temp sensor reference design touts remarkable cost savings

Posted: 27 Mar 2015 ?? ?Print Version ?Bookmark and Share

Keywords:Maxim Integrated? reference design? temperature sensor? converter?

Maxim Integrated Products Inc. has announced a temperature sensor reference design (RD) that allows designers to save power, cost and space. Geared for 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 0.5C 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 setup, 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 -40C to 150C, 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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