5 Replies Latest reply on Feb 19, 2015 11:02 AM by mengxuan.ma

    Design your own application board using PSoC 5lp

    mengxuan.ma

       Hi all, 

         

      Greetings,

         

      I'm trying to design my own application board using PSoC 5lp.  All the functionalities of the new board are :

         

      1) Cy8C5868 chip can work well

         

      2) It can be programmed by Miniprog3

         

      3) It can connect to PC using USB

         

      4) connectors for at least 32 GPIOs

         

      5) Powers

         

      In addition, I used development kit to test my application before.   I read the schematic of Develpment kit (attached here). But it contains a lot extra modules that I don't need. Sadly,  I can't totally understand some modules.  Are these parts below necessary for my new design:

         

      1)Voltage Reference

         

      2) Protection circuits

         

      3)Internal Boost Regulator

         

      Could you please also tell me the main function of these parts? :)

         

      Also, I will appreciate any suggestions from you about how to design the new board. 

         

      Thank you so much!

        • 1. Re: Design your own application board using PSoC 5lp
          user_14586677

          1)Voltage Reference

             

           

             

          Thats internal in PSOC unless you wanted to use an external reference. Allow

             

          for the option to bypass to a fixed pin the internal reference to minimize ref

             

          noise at high resolutions. There is a dedicated pin for this use to implement

             

          the Vref bypass.

             

           

             

          2) Protection circuits

             

           

             

          To protect pins from transients that try to take pin > Vdd + .5 or < Vss - .5.

             

          These transients can cause latchup of PSOC or at least unpredictable

             

          operational faults.

             

           

             

          3)Internal Boost Regulator

             

           

             

          For operation on singler cell battery applications, or very low voltage rail

             

          that you need to boost to allow PSOC to run at a higher voltage.

             

           

             

          Regards, Dana.

          • 2. Re: Design your own application board using PSoC 5lp
            user_14586677

            Some useful references -

               

             

               

                

               

                      

               

            http://www.cypress.com/?rID=43337     AN61290 - PSoC® 3 and PSoC 5LP Hardware Design Considerations

               

             

               

                

               

                      

               

            http://www.cypress.com/?rID=39677     AN57821 - PSoC® 3, PSoC 4, and PSoC 5LP Mixed Signal Circuit Board Layout Considerations

               

            http://www.cypress.com/?rID=40247     AN58827 - PSoC® 3 and PSoC 5LP Internal Analog Routing Considerations

               

            http://www.cypress.com/?rID=39974     AN58304 - PSoC® 3 and PSoC 5LP – Pin Selection for Analog Designs

               

             

               

            Regards, Dana.

            • 3. Re: Design your own application board using PSoC 5lp
              jim.gilmartin

              Use a board with 2 mill copper so you can replace the parts you burn out. Use single sided board.

                 

              Use a separate 5 volt and 3.3 volt regulator and put current limiting resistors in line. You will most probably use components with different voltage levels.

                 

              Put current limiting resistors or use opto couplers on all IO. This is where you will fry most parts. 

                 

              Get in the habit of using cable connectors that are shrouded. A DB25 connector  on the board with a plug that has removable pins works well and is durable.

                 

              Some boards can be hard to program if there is already a program running that uses IO such as PWM or I2C or something of the sort so if you can put headers and jumpers on all io pins.

              • 4. Re: Design your own application board using PSoC 5lp
                mengxuan.ma

                Hello Dana,

                   

                Thank you for your clearly explaination about those parts. Also the materials are also useful. 

                   

                Best Regards,

                   

                Mary

                • 5. Re: Design your own application board using PSoC 5lp
                  mengxuan.ma

                   Hello SCAS,

                     

                  Thank you for helping me!

                     

                  You suggested using a separate 5 volt and 3.3 volt regulator. I get confused for this part.  Could I only design 3.3 volt power for my board. Is 5 volt necessary? Thank you:)

                     

                  Best Regards,

                     

                  Mary