Cold-Junction Compensated, 1-Wire Thermocouple-to-Digital Converters

Accurate 1-Wire thermocouple-to-digital converter ICs ease design effort and lower system cost

Image of Maxim Integrated's Cold-Junction Compensated, 1-Wire Thermocouple-to-Digital Converters

The MAX31850/MAX31851 cold-junction compensated, 1-Wire® thermocouple-to-digital converters perform cold-junction compensation and digitize the signal from a K-, J-, N-, T-, S-, R-, or E-type thermocouple. The converters resolve temperatures to 0.25°C, allow readings as high as +1768°C and as low as -270°C, and exhibit thermocouple accuracy of 8 LSBs (2°C) for temperatures ranging from -200°C to +700°C.

Communication with the master microcontroller is over a 1-Wire bus that by definition requires only one data line (and ground) for communication. Operating power can be obtained directly from the data line ("parasite power"), eliminating the need for an external power supply.

Each device has a unique 64-bit serial code, which allows multiple units to function on the same 1-Wire bus. Therefore, it is simple to use one microcontroller (the master device) to monitor temperature from many thermocouples distributed over a large area.

Four location address inputs simplify mapping of individual units to specific locations.

Features

  • Cold-junction compensation
  • 14-bit, 0.25°C resolution
  • Versions available for multiple thermocouples types: MAX31850 supports K-, J-, N-, T-, and E-types; MAX31851 supports S- and R-types (see table 1 in the full data sheet)
  • 1-wire interface (read-only); power can be obtained from interface (parasite-powered mode)
  • Detects thermocouple shorts to GND or VDD
  • Detects open thermocouple

MAX31850/MAX31851

ImageManufacturer Part NumberDescriptionAvailable Quantity
MAX31850KATB+ datasheet linkIC CONV THRMCPLE-DIG K TYPE TDFNMAX31850KATB+IC CONV THRMCPLE-DIG K TYPE TDFN695 - Immediate
2100 - Factory Stock
MAX31850KATB+ product page link
MAX31850TATB+ datasheet linkIC CONV THRMCPLE-DIG T TYPE TDFNMAX31850TATB+IC CONV THRMCPLE-DIG T TYPE TDFN2016 - Immediate
3825 - Factory Stock
MAX31850TATB+ product page link
MAX31850JATB+ datasheet linkIC CONV THRMCPLE-DIG J TYPE TDFNMAX31850JATB+IC CONV THRMCPLE-DIG J TYPE TDFN1955 - Immediate
750 - Factory Stock
MAX31850JATB+ product page link
MAX31850EVKIT# datasheet linkEVAL KIT FOR MAX31850MAX31850EVKIT#EVAL KIT FOR MAX318504 - Immediate
7 - Factory Stock
MAX31850EVKIT# product page link
MAX31850EATB+ datasheet linkIC CONV THRMCPLE-DIG E TYPE TDFNMAX31850EATB+IC CONV THRMCPLE-DIG E TYPE TDFN70 - Immediate
2550 - Factory Stock
MAX31850EATB+ product page link
MAX31851RATB+ datasheet linkIC THRMOCPLE TO DIG CONV 10TDFNMAX31851RATB+IC THRMOCPLE TO DIG CONV 10TDFN68 - Immediate
MAX31851RATB+ product page link
MAX31850NATB+ datasheet linkIC CONV THRMCPLE-DIG N TYPE TDFNMAX31850NATB+IC CONV THRMCPLE-DIG N TYPE TDFN20 - Immediate
750 - Factory Stock
MAX31850NATB+ product page link
MAX31851SATB+ datasheet linkIC THRMOCPLE TO DIG CONV 10TDFNMAX31851SATB+IC THRMOCPLE TO DIG CONV 10TDFN1 - Immediate
525 - Factory Stock
MAX31851SATB+ product page link
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Published: 2013-12-13