1 Reply Latest reply on Jun 2, 2016 3:34 AM by user_78878863

    Powering VDDIO from internal regulator

    user_185194099

      On one of our boards we need many pins with VDDIO = 1.8V.

         

      We have a 1.8V converter on board, but it should be equipped with an enable input, as 

         

      it powers many other components.

         

      The PSoC is powered from and external 3.3V source.

         

      In order to avoid the dependence on an external 1.8V source I wonder whether we

         

      could power one VDDIO-bank from the internal regulator for digital logic, VCCD.

         

      The data sheet says: "The regulator output is not designed to drive external
      circuits.", but would VDDIO qualify as "external circuit"?

         

      I could think of using two  Shottky diodes and supplying VDDIO from the onboard regulator when it is up, 

         

      and use VCCD only to get enough supply to activate the enable output.

         

       

         

      Andreas