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MSP430I2041: MSP430i2041 for thermocuple ?

Michael Kegler
Prodigy 40 points
Part Number: MSP430I2041
Other Parts Discussed in Thread: MSP430I2040,

Hello,

a general question about the i2041.
Is it suitable to measure thermocouples or are there any
better suited MCU with 16/24Bit ADC in the same size?

  • 0
    Guru 38800 points

    I suggest an external conditioner. Check out TI's app note about a 2 channel K-type measurement system, SBAA354.

    https://www.ti.com/lit/an/sbaa354/sbaa354.pdf

  • 0 in reply to Keith Barkley
    Prodigy 40 points

    Hallo Keith,

    Die Idee ist gut. Nur auf der LP ist keine MCU und kein externer AD-Wandler auf der LP. Gibt es
    keine MCU mit 16/24Bit und einer Baugröße von 5x5mm?

  • 0 in reply to Keith Barkley
    Prodigy 40 points

    The idea is a good one. Only on the LP is no
    MCU and external AD converter on the LP. Is there
    no MCU with 16/24Bit and a package size of 5x5mm?

  • 0 in reply to Michael Kegler
    Guru 38800 points

    You haven't even told us what thermocouple you want to use. But you can do the math. Find the resolution of the ADC at the minimum reference voltage. From there you can see what temperature resolution you get from your thermocouple.

    Note that no MCU can measure negative voltages.

  • 0 in reply to Keith Barkley
    TI__Mastermind 28070 points

    Michael,

    You could do this with the MSP430i2041 or the MSP430I2040 (if you don't need the full 32kB flash and 1kB RAM). Those are probably the best price/ADC resolution in the size you want. The 24-bit delta sigma is well suited for measurements of slow changing parameters like temperature. 

    That application note Keith linked is a good resource. I'd also recommend A Basic Guide to Thermocouple Measurements (SBAA274) if you are new to using thermocouples in general. 

    Best Regards,
    Brandon Fisher

  • 0 in reply to Brandon Fisher94
    Prodigy 40 points

    Hello Brandon, Hello Keith,

    first of all, thank you very much for your answers.
    You wanted to know which thermocouples we want to measure.
    Well, that it is a transmitter, it measures type S, K, T, J, B, N, E, R, C, L, U. I have been dealing with thermocouples for almost 20 years and have written some firmware forTI-MCUs. But now we have very special requirements for a project, so I need a small MCU with max. 5x5mm and 16/24bit SD-converter. We like to use TI MCUs for this. My question therefore aimed at whether the i2041 is suitable for this, or whether TI has comparable MCUs in the portfolio, the
    which I cannot find at the moment. Can you help me further there. As I said, external ADCs cannot be used for space reasons. Do you have any suggestions / proposals in this regard.

    best regards

    Michael

  • +1 in reply to Michael Kegler
    TI__Mastermind 28070 points

    Hi Michael,

    Thank you for clarifying. 

    Michael Kegler said:
    Well, that it is a transmitter, it measures type S, K, T, J, B, N, E, R, C, L, U. I have been dealing with thermocouples for almost 20 years and have written some firmware forTI-MCUs. But now we have very special requirements for a project, so I need a small MCU with max. 5x5mm and 16/24bit SD-converter. We like to use TI MCUs for this. My question therefore aimed at whether the i2041 is suitable for this, or whether TI has comparable MCUs in the portfolio, the
    which I cannot find at the moment. Can you help me further there. As I said, external ADCs cannot be used for space reasons. Do you have any suggestions / proposals in this regard.

    You have selected the best device from our MSP430 portfolio for this in terms of your size and ADC requirements.

    I don't believe we have a full proposal/design for using the SD24 with any kind of thermocouple. That said, the SD24 inside the MSP430I204x family does not differ from an external delta-sigma ADC with internal PGA in any substantial way. So anything you could do with an external 24-bit Sigma Delta you can do with this integrated one. As Keith said you just need to keep in mind that the supply is unipolar .

    Best Regards,
    Brandon Fisher

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