2 Replies Latest reply on Oct 13, 2012 6:51 AM by user_14586677

    Power estimation

    prashant.joshi

      Sir,

         

      Is it possible in PSOC  to estimate the power drawn by the processor while executing code? . If yes please give me instructions how to perform.

         

       

         

      Thanks & Regards

         

      Prashant

        • 1. Re: Power estimation
          user_14586677

          The easiest most straight forward method is to simply place a milliameter in
          series with Vdd lead and measure Idd, another meter to measure Vdd at chip
          Vdd pin. Then P = Vdd x Idd.

             

          Another method is use PSOC to measure Vdd/2 and use a high side current sense
          to measure Idd.

             

          Regards, Dana.

          • 2. Re: Power estimation
            user_14586677

            I was not paying attention you want to do this while executing code.

               

             

               

            PSOC can measure its own Vdd via use of internal reference and

               

            a PGA with gain set to .5. Noite bias cannot be set to high in order

               

            to get common mode in range to Vdd for PGA.

               

             

               

            To measure Idd you need a high side sense, an external discrete solution

               

            or a chip, like http://www.maximintegrated.com/app-notes/index.mvp/id/746

               

            Other methods measure T rise in a sense resistor in Vdd lead, light level

               

            of a calibrated emitter in series with Vdd lead.

               

             

               

            Regards, Dana.