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TMP441: Accuracy Improvement by Beta Compensation

Shinichi Yokota
Genius 9715 points
Part Number: TMP441

Hello,

I'm wondering how much the accuracy of remote temperature sensing can improve by TMP441's beta compensation function. Do you have any articles, apps notes, or practical data on this topic?

Best regards,
Shinichi Yokota

  • 0
    TI__Mastermind 43805 points

    Hi Shinichi-san,

    Beta compensation addresses a problem with modern embedded junctions. It enables accurate temperature measurements on these junctions that are compromised by extremely low beta (typically beta less than 1.) Beta compensation does not enhance accuracy of normal junctions. 

    thanks,

    ren

  • 0 in reply to Ren Schackmann
    TI__Genius 9715 points

    Ren,

    If the beta of a transistor embedded in an FPGA is unknown, I guess the TMP441's automatic beta detection function would help identify it. If that's correct, is it OK to just set 1b to the MSB of the Beta Compensation Configuration Register? In other words, does it have no impact to write any number to the three LSBs?

    • Beta Compensation Configuration Register: 1xxxb – automatic beta detection
      • Does it have no impact to write the xxxb bits?

    Please let me ask one more question. Can a detected beta range be read through this Beta Compensation Configuration Register?

    Best regards,
    Shinichi Yokota

  • 0 in reply to Shinichi Yokota
    TI__Mastermind 43805 points

    Writing 1xxx will enable automatic detection, and the xxx bits don't have any effect when the MSBit is 1. The automatically chosen range can be read back after a conversion completes.

    thanks,

    ren