4 Replies Latest reply on May 31, 2018 1:50 AM by nsha

    Regarding MBR proximity tuning.

    matsubara-y_1534086

      Hello

       

      Below is MBR Design Guide description(P.87)

      => http://www.cypress.com/file/46366/download

      =============================================================================

      6. Set the finger threshold as equal to the proximity positive threshold. This is required to determine the response of the ALP filter

      =============================================================================

       

      Which parameter refers to this “finger threshold”?

      Is this “Proximity Touch Threshold”?

      Or is this “Proximity Threshold”?

       

      “Proximity Threshold” range is from 31 to 200.

      “Proximity Touch Threshold” range is from 62 to 65000.

       

      If proximity positive threshold is below is 31 or 62, finger threshold can not be set to the same value as proximity positive threshold.

      In this case how should we decide finger threshold?

       

      If finger threshold and proximity positive threshold are not the same value, will ALP filter not operate properly?

       

       

      And MBR describes about “Proximity Touch Threshold” at Table 6-6.

      =============================================================================

      “Proximity Touch Threshold” is “80% of Difference count (when proximity sensor is touched)”.

      =============================================================================

       

      If “Proximity Touch Threshold” has to be the same value as proximity positive threshold at ALP filter enabled, I think the following two descriptions(A, B) contradict each other.

      (when finger threshold  of A points “Proximity Touch Threshold”.)

      How do I think about it?

      When using ALP filter, should we consider only A case?

      =============================================================================

      A. Set the finger threshold as equal to the proximity positive threshold. This is required to determine the response of the ALP filter

      B. “Proximity Touch Threshold” is “80% of Difference count (when proximity sensor is touched)”.

      =============================================================================

       

       

       

      Best Regards.

      Yutaka Matsubara

        • 1. Re: Regarding MBR proximity tuning.
          nsha

          Hi,

           

          Setting the finger threshold to proximity positive threshold is only for tuning the ALP filter.

          After the tuning process is done, the finger threshold is set according to the signal observed (as per Table 6-5).

           

          Finger threshold is equal to the proximity threshold. (Set to the lowest value possible, if proximity positive threshold is less than 30)

           

          Thanks and regards,
          Shanmathi

          • 2. Re: Regarding MBR proximity tuning.
            matsubara-y_1534086

            Shanmathi-san.

             

             

            Q1)

            Below is your answer.

            >>> Setting the finger threshold to proximity positive threshold is only for tuning the ALP filter.

             

            I want to clarify what “finger threshold” you said is pointing.

             

            “finger threshold” you said is “Finger Threshold” of EZ-click.(Below Red circle). Not proximity threshold of EZ-click.(Below Blue circle).

            Is my understanding correct?

             

             

            Q2)

            Below is your answer.

            =============================================

            Finger threshold is equal to the proximity threshold. (Set to the lowest value possible, if proximity positive threshold is less than 30)

            =============================================

             

            Does ALP filter work correctly even if “Finger threshold” and proximity positive threshold are not the same value?

             

             

            Best Regards.

            Yutaka Matsubara

            • 3. Re: Regarding MBR proximity tuning.
              matsubara-y_1534086

              Shanmathi-san.

               

              Can you update this discussion?

               

              Best Regards.

              Yutaka Matsubara

              • 4. Re: Regarding MBR proximity tuning.
                nsha

                Hi Matsubara-san,

                 

                1) Finger threshold here (in design guide) refers to proximity threshold of Ez-Click.

                Finger threshold in Ez-Click refers to proximity touch threshold.

                 

                2) The requirement for ALP filter is that finger threshold (proximity threshold here) should be greater than or equal to proximity positive threshold.

                 

                Thanks and regards,

                Shanmathi