4 Replies Latest reply on Dec 2, 2019 7:25 AM by AnJu_3725101

    CY8C4024LQI-S411 / current consumption vs temperature

    AnJu_3725101

      Hello all,

       

      I'm using the PSOC CY8C4024LQI-S411 in a lightsource application. I have asserted that the current consumption of the PSOC drops when the ambient temperature rises. Does any one have the same experience and have an explanation for it?

       

      Voltage supply of the PSOC is constant.

       

      Kind regards

       

      Andreas

        • 1. Re: CY8C4024LQI-S411 / current consumption vs temperature
          EktaN_26

          Hello Andreas,

           

          Can you please provide us the following information:

           

          1) The temperature range over which you are observing this behavior.

          2) The variation in current that you are observing.

          3) Are you making this observation in low power mode?

           

          Best Regards

          Ekta

          • 2. Re: CY8C4024LQI-S411 / current consumption vs temperature
            AnJu_3725101

            Hello Ekta,

             

            thanks for your Reply.

             

            I have an application which must be tested in a climatic chamber,

             

            The current consumption of the PSOC is about 10 mA. I haven't activated a low power mode

             

            The ambient temperature of the chamber is set to 55°C. The current consumption of the PSOC then drops down to 6  mA.

            After Setting back tempeature to 25°C current goes back to 10mA. Lowering the temperature to -15°C current Drops again to 6  mA.

             

            I'm using a capsense module  for creating of a push button and a PWM Generator inside the PSOC.

             

            As I have read inside the Cypress documents temperature changes will adapt the capsense sensors Analyse algorithms? Is this the reason?

             

            Kind regards

            Andreas

            • 3. Re: CY8C4024LQI-S411 / current consumption vs temperature
              EktaN_26

              Hello Andreas,

               

              I have confirmed that capsense sensors Analyse algorithms are not responsible for current variations.

               

              Can you please attach the schematic of the board that you are using so that we can do a schematic review to analyse the cause of such a behaviour.

               

              Best Regards

              Ekta

              • 4. Re: CY8C4024LQI-S411 / current consumption vs temperature
                AnJu_3725101

                Hello Ekta,

                attached is the schematic. The circuit is supplied through a 5 V regulator which is not equipped on this PCB but on a second one. When testing, the second PCB was connected with a supply wire so that I could exclude influence of temperature to the voltage supply.  I have in parallel measured the voltage when I did the temperature tests, it was stable.PSOC.jpg

                Best regards
                Andreas