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Interfacing a thermocouple to MSP430

Hi...

One of my customers' wants to interface a PT100, and also J and K thermocouple to MSP430 to measure a temperature upto 2000 degC. The three temperature sensors are selectable. 

Is it possible to build a single chip solution with the MSP430?

Thanks

Suman.

 

  • Suman Ghosh said:
    Is it possible to build a single chip solution with the MSP430

    Possible? Sure. Advisable? Perhaps not, depending on your requirements (range, tolerance, noise immunity, stability, resolution).

    YOu need some circuitry that produces a voltage from the sensors with not too high impedance, then teh MSP can measure this voltage (either with the ADC12 or the SD16 module, depending on your MSP selection) and calculate the result. ALL MSPs with SDC12 or SD16 module support more than one channel (ADC12:8, ADC12A:12, SD16:up to 8), so this is not the problem. The SD16 is better for noise suppression on slowly-changing signals (below 1kHz sampling), the ADC12 is better for fast sampling (up to 300kHz) and easier to handle.

    However, getting a voltage level within the ADCs/SD16s dynamic range (linear if possible) requires some external circuitry and may require the use of OpAmps. And 2000°C is a bit much for an MSP, so the sensor needs to be some distance away and impedance/noise becomes a really big problem.

    I'm sorry that this won't help you much, but it all depends on so many factors that I cannot give a definitive answer. But I doubt that any MCU, other than one specifically designed for this task, will do a better job (or much worse) than an MSP.

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