4 Replies Latest reply on Jun 10, 2019 5:05 PM by RyYo_1406951

    PSoC4100SP:CapSense Hardware scan time

    RyYo_1406951

      Below, the same sentences are written in English and Japanese.

       

      ・Engilsh
      The "Hardware scan time" is displayed on the CapSense component setting screen.
      Do these ”hardware scan time” fluctuate due to external influences?

       

      ・日本語(Japanese)
      CapSenseコンポネント設定画面で、Hardware scan timeが表示されます。
      これらのHardware scan timeは、外部からの影響で変動することありますか?

       

      無題1.png

       

      Regards

        • 1. Re: PSoC4100SP:CapSense Hardware scan time
          BragadeeshV_41

          Hi RyYo_1406951,

           

          Can you please let me know what you mean by external influence? In general, the hardware scan time mentioned in the CapSense component customizer is the typical time it takes to scan the sensor based on the formula (2^n-1)/ Mod_Clk. But in reality, the actual scan time is the sum of sensor scan time, duration of initialization prior a scan, duration of firmware execution and other components in your firmware such as ISR, which is not predictable.

           

          Regards,

          Bragadeesh

          • 2. Re: PSoC4100SP:CapSense Hardware scan time
            RyYo_1406951

            Bragadeesh -san

             

            ・English
            >Can you please let me know what you mean by external influence?
            →External influence is noise.

             

            >But in reality, the actual scan time is the sum of sensor scan time, duration of initialization prior a scan, duration of firmware execution and other components in your firmware such as ISR, which is not predictable.
            →Among them, I would like to know if the sensor scan time((2^n-1)/ Mod_Clk) may fluctuate.

             

            ・Japanese
            >Can you please let me know what you mean by external influence?
            →ノイズを指しています。

             

            >But in reality, the actual scan time is the sum of sensor scan time, duration of initialization prior a scan, duration of firmware execution and other components in your firmware such as ISR, which is not predictable.
            →その中でセンサースキャン時間((2^n-1)/ Mod_Clk)は、変動する可能性あるか知りたいです。

             

            Regards

            • 3. Re: PSoC4100SP:CapSense Hardware scan time
              BragadeeshV_41

              Dear fj0176bu_1406951,

               

              Scan time doesn't vary with noise. But if IMO changes due to temperature changes, mod clock might be affected, thereby affecting scan time. Please refer to the specific device datasheet for the IMO accuracy over temperature.

               

              Regards,

              Bragadeesh

              • 4. Re: PSoC4100SP:CapSense Hardware scan time
                RyYo_1406951

                Thank you for your answer.