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Long twisted pair reads digital temperature sensor

Posted: 14 Jan 2011     Print Version  Bookmark and Share

Keywords:MAX6576  MAX9140  twisted-pair cable 

The best choice for midrange, low-to-medium-accuracy temperature measurements (considering size, cost, performance, and ease of use) is an IC temperature sensor—assuming the circuits to be interfaced with the sensor reside on the same board or in the same box. Most IC temperature sensors are designed for applications in which the circuits to which they connect are nearby, so the inclusion of sensing, digitizing, and signal processing functions in a single IC greatly simplifies the design of such sensors and the data-acquisition interface.

This application note discusses a circuit that is a simple and economical interface for remote IC thermal sensors. The temperature sensor (MAX6576), an absolute temperature-to-period converter that integrates the sensor with the necessary signal electronics, connects to the receiver (a MAX9140 comparator) using a twisted-pair cable that carries power to and signals from the sensor.

View the PDF document for more information.





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