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TMP007: Calibration Data Units

Benjamin Whittington
Prodigy 20 points

Part Number: TMP007

Simple question about calibration of the TMP007 thermal sensor.  What units do the calibration equations assume for the temperatures and voltages.  The chip provides sensor voltage in mV and die temperature in C.  Should these values be put right into the cal equations as is or is there a unit conversion necessary (ie to V and K, or uV and C, etc)?

Thanks 

  • 0
    TI__Mastermind 43715 points
    Ultimately, it should be in volts and kelvins. Depending on which version of the equation you have, there may be built in conversions from uV and C. Also, it's worth noting that in most places where die temperature is used, it is the delta from ambient (Tref) not the absolute temperature. In this case, it doesn't matter if kelvin or celsius is used as long as the format of Tref is matched. The T^4 portion of the equation must be in kelvins, though.

    This product is now NRND. This means it is no longer recommended for new designs. TI products with an NRND status may eventually be discontinued. This affects all versions of the infrared thermopile produced by TI.

    Ren
  • 0 in reply to Ren Schackmann
    Prodigy 20 points
    I am using the equations on page 6 of the calibration guide (SBOU142 - August 2014). Point taken about the delta T relating to die temperature. So the output of equation 4 (Vos) is in V and thus Vsensor must be converted to V (from its output units of mV) prior to use in equation 5?

    Relating to the NRND, is their a replacement sensor in the TI offerings that you suggest as a suitable replacement or is TI getting out of the IR thermal sensor business all together?
  • 0 in reply to Benjamin Whittington
    TI__Mastermind 43715 points
    That document (SBOU142) is written for Volts and C, because Tref = 25. It fails to mention that Tdie^4 must be (Tdie+273.15)^4.

    We don't have another non-contact temperature sensor product. I would be happy to assist you with contact temperature sensors.

    Ren