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LM94023: Temperature Accuracy

Alisa Knorr
Prodigy 595 points
Part Number: LM94023

Hello dear Sensing Team, 

I  have a question regarding the LM94023 temperature accuracy. I would like to know, what accuracy degree can be achieved, minus the calculated nonlinearity of the MCU. Can the accuracy be improved, when applying the linear approximation, mentioned on the p.11 of the datasheet?

Or is the linear approximation already included in the following values?

Temperature Accuracy:

-20°C to 40°C ± 1.5°C

-50°C to 70°C ± 1.8°C

-50°C to 90°C ± 2.1°C

-50°C to 150°C ± 2.7°C

BR

  • 0
    TI__Mastermind 28070 points

    Hello Catarina,

    The values you are citing are in reference to Table 1 in the datasheet, and is all we can guarantee from that part. This look up table is likely to give you the best results possible. The linear approximation may have better accuracy over some small ranges, but we do not guarantee a device accuracy if a linear approximation is used.

    Best Regards,
    Brandon Fisher

  • 0 in reply to Brandon Fisher94
    TI__Prodigy 595 points
    Hello Brandon,

    Thank you for the response. I would like to know, whether the accuracy can be improved through linear approximation further more, than the values given in the datasheet. Especially, if the nonlinearity of the MCU is already included in the calculations.

    BR,

    Catarina
  • 0 in reply to Alisa Knorr
    TI__Mastermind 28070 points

    Hello Catarina,

    It is possible to characterize a system after the device is integrated and attempt to use a linear approximation to improve the overall system accuracy, but this would need to be done on a device-by-device basis using a more accurate temperature sensor.  This could remove any offset that the system added, but would still not be guaranteed to improve total system accuracy beyond the LM94023 accuracy.

    The datasheet specified accuracy is the absolute limit of what we can guarantee, regardless of what additional methods are employed to improve it. If you are looking for a higher-accuracy temp sensor, the TMP235 is a good alternative.

    Best Regards,

    Brandon Fisher