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Why is "...difference between RpMIN and RpMAX values reaches x25 - x26.." so important?

Igor Gorbounov
Expert 1070 points

Hi TI Team,

there is a famous calibration technique (http://e2e.ti.com/support/sensor/inductive-sensing/f/938/p/298126/1042212.aspx) from Evgeny Fomin, and there in the step 7 is said that "...the difference between RpMIN and RpMAX values.." should not exceed 0x25-0x26. Why is this rule so important?

Best regards,

       Igor Gorbounov

  • 0
    TI__Expert 6550 points

    Igor,

    There is a difference between 'reaches' and 'should not exceed'. What we are saying, is that the difference should reach a certain amount of codes which translates to a hex value in the register.  

    '' ... OR the difference between RpMIN and RpMAX values reaches x25 - x26, that is your optimal RpMAX setting ".

    The technique is important because you want to use the maximum resolution possible. I hope this clarifies:

    Please, let me know if you have any questions.

    Best Regards,

    Natallia Holubeva
     
        
      
      
      
      
      
      
      
      
      
      
      
     
     

  • 0 in reply to Natallia Holubeva1
    Expert 1070 points

    Hi Natalia,

    I see now that I've made a mistake in my question: the difference sholdn't be LESS than 0x25-0x26.

    Now I see from your answer that this is somehow related to measurement technique - perhaps

    when this difference is small the measurements are noisy. I ask this only because there is no

    official appnote with calibration method released yet, though several times promised.

    Thank you for your answer.

         Igor Gorbounov

  • 0 in reply to Igor Gorbounov
    TI__Expert 6550 points

    Hello Igor,

    We are working on it. I apologize for the delay.

    Best Regards,

    Natallia Holubeva