5 Replies Latest reply on Jan 15, 2014 12:26 PM by user_1377889

    Two PSOC1 chips in synchronization..

    vaibhav.landge

       Hi,

         

      I want to use two PSOC1 chips which will operate at same frequency and their clocks near to perfect phase aligned.

         

      Can you please suggest feasible options to achieve this?

         

       

         

      Thanks

        • 1. Re: Two PSOC1 chips in synchronization..
          seg

          Set one chip to have a clock output at 12 MHz on a pin. Route this signal to P1.4 on the other device, select external clock source in PSoC Designer.

             

          ---- Dennis

          • 2. Re: Two PSOC1 chips in synchronization..
            user_1377889

            Can it be that you want to execute the same program simultanously on two different chips? If so, you'll need a synchronization feature between them, since they may not startup perfectly parallel, there are some uncalculatable delays.

               

            If you tell us a bit more about what you want to accomplish we might help you better.

               

             

               

            Bob

            • 3. Re: Two PSOC1 chips in synchronization..
              user_14586677

              If you wanted a truly synched pair of processors, like used in medical

                 

              drug delivery applications, you would need a reset pin that controls

                 

              startup of the internal CPU state machine, and of course no analog

                 

              to digital processes driving logic, unless re-synched.

                 

               

                 

              PSOC 1 startup is internally controlled from external voltage Vdd ramp.

                 

              So to just take a low jitter clock and set both PSOCs to external clock would

                 

              not suffice. Thats if you want them both executing the same code at the same

                 

              point in time.

                 

               

                 

                  

                 

                        

                 

              http://www.cypress.com/?rID=58522      AN73617

                 

               

                 

              As Bob stated, a more definitive description of what you are trying to do would

                 

              be helpful.

                 

               

                 

              Regards, Dana.

              • 4. Re: Two PSOC1 chips in synchronization..
                vaibhav.landge

                 Thanks for the response. I want to operate Capsense modules of both PSOC chips in synchronization (clock, shield signal are to be in phase). Is that clear enough?

                • 5. Re: Two PSOC1 chips in synchronization..
                  user_1377889

                  Since CapSense is not a passive process but an active one where some C is charged and measured one PSoC chip will influence the other when using CapSense on the same buttons / sliders. Additionally it will not be guaranteed that both PSoCs come out of reset synchron. So your explanation will not be enough. The remaining question is: What is the idea behind those two PSoCs, what job ( mission are you trying to accomplish this way?

                     

                   

                     

                  Bob