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1-wire thermocouple-to-digital converter

Posted: 12 Jul 2013     Print Version  Bookmark and Share

Keywords:Maxim Integrated Products  thermocouple-to-digital converter  MAX31850  MAX31851 

Maxim Integrated Products Inc. has begun sampling its recently released cold-junction-compensated, 1-wire thermocouple-to-digital converters. The MAX31850 and MAX31851 achieve ±2°C accuracy (not including sensor nonlinearity) while integrating all of the functions required for a complete thermocouple-to-digital solution, noted the company.

Additionally, the MAX31850/MAX31851’s 1-wire interface allows multiple sensor locations to communicate and draw power over a single data line, greatly simplifying wiring requirements. Maxim also stated that designers can use the MAX31850 or MAX31851 instead of multiple discrete components for accurate temperature measurement in medical, industrial and solar applications.

Because thermocouple output voltages are small and cold-junction compensation is needed to achieve accurate results, the digitization of thermocouple signals can be a challenge.

According to the firm, the MAX31850/MAX31851 are the industry’s first solution to integrate a discrete ADC, a highly accurate reference, a temperature sensor for cold-junction compensation and a 1-wire bus interface into a single chip. The versatile converters operate with several types of thermocouples, speeding system design, lowering system cost and reducing the BOM. The MAX31850/MAX31851 also identify open or shorted thermocouples that could result in erroneous temperature readings or system faults. An MCU can read the fault status at any time to help ensure uptime and prevent costly repairs.

The devices’ 1-wire interface allows for a large number of devices on the same communication bus. Their four dedicated address pins uniquely identify up to 16 sensor locations. Also, the MAX31850 is available for K, J, N, T and E thermocouple types while the MAX31851 is available for R and S thermocouple types. Available in a 10-pin, exposed-pad TDFN package (3 x 4 x 0.75mm), the devices are specified over the -40°C to 85°C temperature range. Pricing starts at Rs.168.48 ($3.10) (1000-up, FOB USA).

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