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Home | Product Categories | SMD ICs | COM-00307

Thermocouple Amplifier Digital MAX6675

sku: COM-00307

Description: MAXIM IC MAX6675 Cold Junction Compensated K-Type Thermocouple to Digital Converter. This simple 8-pin SOIC IC attaches directly to any K-Type Thermocouple and interfaces via a SPI read-only interface.

Check out this really neat tutorial using the thermocouple, MAX6675, and FT232 for control. Nice work Michael!

Works great with 8-pin SOIC to DIP adapters.

  • 0.25C Resolution
  • 0C to +1024C
  • Minimal 2-wire digital interface

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552 in stock

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images are CC BY-NC-SA 3.0

ASCII version


Comments 8 comments

  • PolePole | about a year ago 1

    Could I use a multiplexer with one 6675 to read from multiple thermocouples, or do I need a 6675 for each thermocouple in my project?

    • rj44319 | about a year ago 1

      No, Use separate chips and use common ck and DO lines and then have multiple CS lines. Works great for me.

  • rj44319 | about a year ago 1

    fix

  • tjfreebo | about 11 months ago 1

    There’s a nice Arduino Max6675 Library available to really simplify reading temperature data from this amplifier.

  • Sleahey | about 10 months ago 1

    Has anyone tried using these on a shared SPI bus?

  • scottj | about 10 months ago 1

    would this work with Serial Multiplexer Breakout – TS3A5017
    (sku: BOB-08970)
    Has anyone tried this? I would like to use 4 thermocouple probes, but avoid expense of 4 of MAX6675 chips.
    Is there a BOB board available for this chip?

    • Sleahey | about 9 months ago 1

      In theory I think may affect the cold junction compensation a little, as would having long tracks between where the thermocouple terminates, and where the IC is located (as it measures temp on the IC to compensate)
      I see no reason why it would cause a problem,
      in particular the amplifier is likely Hi-z, and the source impedance of the thermocouple is low, like 1R ~ 10R depending on the particulars.
      offsets introduced by using the switch (if there are any) would be the thing to look out for.