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TMP006 Ti app note Math algorithms don't make sense looking at the data

Ron Bindl
Prodigy 10 points
Other Parts Discussed in Thread: TMP006, TMP007

We are using TMP006 in a new design to read target temps remotely.  It seems the readings based on the canned Math algorithms taken from the App note, do not provide the temp as measured by a secondary reference thermometer.  Part of the issue seems to be the die temp has to reach the target temp to get close to an accurate reading and is still off.  I have spread sheet data to send if some one can help with this.

Thank you

Ron

  • 0
    TI__Expert 6930 points

    Hi Ron,

    I can help you with your questions...please send me the spreadhseet along with a description of your physical setup and test conditions.  We have software that will automatically determine the calibration coefficients and analyze the errors based upon your collected data...to perform the calibration and analysis on your data I will need a CSV file with the following: Column A: The sensor voltage in volts. Column B: the local die temperature in degrees Celcius and Column C: the reference temperature in degrees Celcius...You may o rmay not include a column title in the first row of each column.  In addition please also send me the spreadsheet you use and wherein you make the calculations based upon the sensor voltage, etc and calculate the object temperature...I can check the results against our internal SW.  FYI we do plan to release this software in the coming days and it will be available on the web, but until we release it I am happy to run it for you.

    Also you may or may not be aware but we recently released the next generation of TMP006, the TMP007. The TMP007 does all of the calcuations for you and the output is the local die temperature and remote IR object temperature both in degrees Celcius.  All of the complex computations are done inside a custom math engine embedded in the TMP007.  Please have a look at the documentation associated with the TMP007, we have a calibration guide and a layout guide available on the website that might also be helpful.   The same concepts apply to TMP006 if you choose not to switch to the TMP007...here is the ink to those documents:

    http://www.ti.com/product/TMP007/technicaldocuments