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MSP430FR5962: internal temp sensor clarification

Juan Gonzales
Mastermind 37340 points
Part Number: MSP430FR5962


I have a question about the accuracy of the on-chip temperature sensor.  Reading about the T sensor from various documents, I’m a bit confused as to the accuracy specification.

 

I have implanted equation on section 1.14.3.3 of User Guide for the 2.0 V reference in my code.  By doing this can I say that the reading will be within +/- 3% within the range of 30 to 85C?  This is my assumption.

 

Am I correct about this?  Must I do further corrections to get this +/- 3% accuracy?

 

If you have any suggestions or application notes on getting better accuracy, please let me know.

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    TI__Genius 10980 points
    Hi Juan,

    That +/-3 value is in degrees Celsius, not percentage. Additionally, that is stating that the actual temperatures that the two measured calibration temperatures were measured at were within +/- 3 degrees. For example, CAL _ ADC_ 20T85 could have been the result of measuring a temperature that was actually between 82 and 88 degrees. So that +/- 3 is not the percent accuracy of your calculated temperature value, but rather the number of degrees that the actual temperature used to measure the 2 calibration constants could have been off. This calculation is used to minimize the offset error of the temperature sensor.

    Regards,
    Nathan
  • 0 in reply to Nathan Siegel
    TI__Genius 10980 points
    Hi Juan,

    Did this answer your question? If so, please mark it as answered.

    Thank you,
    Nathan

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