3 Replies Latest reply on Mar 28, 2012 11:58 AM by udayan.umapathi

    Power supply design for PSoC application

    john.ramshur

      Can any of you experienced guys suggest a good power supply design for a general purpose PSoC 3 application. I'm trying to move my PSoC application from the development kit to a printed circuit. My application is only using the ADC and UART interface...no special requirements. I want to use a 3 or 3.3 volt battery. I need suggestions for regulators, etc.

         

      I noticed that the PSoC 3 has internal voltage regulators for internal digital and analog systems. Are there any disadvantages in only using the internal regulators?

         

      Regards

        • 1. Re: Power supply design for PSoC application
          gautam.das.g

          Hi jram,

             
             

           

             
             

          Please refer to Application Note AN57821 which explains the circuit board layout considerations.

             
             

          AN61290 explains hardware design considerations which includes the power system.

             
          • 2. Re: Power supply design for PSoC application
            kartik.mankad

            jram,

               

            Power supply design for your final product need not be extraordinary,but do note that the quality of your supply will directly affect the ADC performance.

               

            From the experience I have of designing a few PSoC3 boards,an ordinary L1117-3.3V type volrage regulator in its typical configuration will serve you well for ADC designs upto 16 bits or so,depending on your board layout.

               

            You could also consider powering your board from a voltage reference.Check out the schematics for the CY8CKIT-030 particularly to get an idea of a good analog oriented power supply.

            • 3. Re: Power supply design for PSoC application
              udayan.umapathi

              I have designed my own PCB with a LM117-3.3 V and hhad pretty ood results on the ADC. As long as you have the right capacitors on the VCCA/VCCD, VDDIO pins you should be good. You can reuse the scematic provided with CY8CKit-030 to quickly get going. Howere to understand the requirements on power supply in detial, you can refer the app noted mentioned above.