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 QuantityBuy Now
IC CONV THRMCPLE-DIG K TYPE TDFNMAX31850KATB+IC CONV THRMCPLE-DIG K TYPE TDFN1402 - Immediate
4275 - Factory Stock
IC CONV THRMCPLE-DIG T TYPE TDFNMAX31850TATB+IC CONV THRMCPLE-DIG T TYPE TDFN2371 - Immediate
450 - Factory Stock
IC CONV THRMCPLE-DIG J TYPE TDFNMAX31850JATB+IC CONV THRMCPLE-DIG J TYPE TDFN2085 - Immediate
975 - Factory Stock
EVAL KIT FOR MAX31850MAX31850EVKIT#EVAL KIT FOR MAX318503 - Immediate
47 - Factory Stock
1-WIRE THRMOCPLE TO DIG CONVMAX31851RATB+1-WIRE THRMOCPLE TO DIG CONV78 - Immediate
525 - Factory Stock
IC CONV THRMCPLE-DIG N TYPE TDFNMAX31850NATB+IC CONV THRMCPLE-DIG N TYPE TDFN20 - Immediate
750 - Factory Stock
IC CONV THRMCPLE-DIG E TYPE TDFNMAX31850EATB+IC CONV THRMCPLE-DIG E TYPE TDFN18 - Immediate
2625 - Factory Stock
1-WIRE THRMOCPLE TO DIG CONVMAX31851SATB+1-WIRE THRMOCPLE TO DIG CONV6 - Immediate
525 - Factory Stock
Published: 2013-12-13