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Original question:

LMT70: The Nonlinearity of LMT70

LMT70: Can TI provide LUT tables for different voltages, such as 3.3V and 5.0V?

Richard Webb
Prodigy 61 points
Part Number: LMT70

The LUT table in the datasheet is for a Vdd of 2.7V, but as I will use either a 3.3V or 5.0V supply for these sensors, can TI provide LUT tables for these two voltages?

  • 0
    TI__Expert 4895 points

    Hi Richard,

    The LUT table shown in the LMT70 datasheet applies to the entire supply voltage range since the output voltage is not supply dependant. The snapshot below shows the supply-induced error (PSR).

    Best regards,

    Simon Rojas

  • 0 in reply to Simon Rojas Avila
    Prodigy 61 points

    Hi Simon,

    Thanks for the reply and confirming that the supply is independent of the TAO output.

    For the supply induced error, if I were to use a 3.3V supply for all my temp sensors, how do I compute the error for the LUT readings?

    Regards,

    Richard.

  • 0 in reply to Richard Webb
    TI__Expert 4895 points

    Hi Richard,

    Usually you could treat PSR as a linear equation. However, this device has a characterization over different temperature/supply ranges. In this case, I would recommend using the min/max limit for error budget calculations. This would include 9 mC/V from -55 C to 120 C and 15 mC/V from 120 C to 150 C.  

    With that you could account for a max error of around 30 mC from -55 C to 120 C and  50 mC from 120 C to 150 C.

    Best regards,

    Simon Rojas