7 Replies Latest reply on May 8, 2014 5:07 AM by user_14586677

    if the board has been burned out

    @qq.com.4

       When I attch the PSoC3‘s P1_6  to a ua741,the LED3 and LED4 solid light. And the development board generate heat.

         

      What cause this problem,if the board has been burned out?  I don’t know how to deal with this problem, really need your help .If you can solve my problem ,thank you very much.

        • 1. Re: if the board has been burned out
          user_14586677

          If the 741's output is connected to PSOC pin, and the 741 is working

             

          off power supplies +/- 5 to +/- 12 or +/-15, th en good chance PSOC has

             

          been damaged. The PSOC can only handle ~ its Vdd + .5 to Vss - .5

             

           

             

          What board are you using ?

             

           

             

          Regards, Dana.

          • 2. Re: if the board has been burned out
            @qq.com.4

             I use the CY8CKIT-030 PSoC3 DEVELOPMENT Kit

               

            What can I do?  Contact to after-sale service.  Thank you very much

            • 3. Re: if the board has been burned out
              user_14586677

              You can do a simple test program on the pin to see if its still

                 

              working, if PSOC can still run a program.

                 

               

                 

              Or use a subcontractor to replace PSOC on board. If you search

                 

              youtube.com there are several videos where people have successfully

                 

              soldered SMD with toaster ovens / heat guns.

                 

               

                 

              Or contact local FAE / Cypress Regional sales manager to see if they

                 

              have any contacts for board repair.

                 

               

                 

              Note you would have to establish what other components might have

                 

              been damaged, like regulators, etc, by troubleshooting schematic to

                 

              see if other power domains OK.

                 

               

                 

              Regards, Dana.

              • 4. Re: if the board has been burned out
                @qq.com.4

                  ps:I use the GPIO as a output pin and attach it to 741.I use a independent power to supply electricity for 741,but I forget to common ground PSoC's GND and power‘s GND.  It can be a problem to damage the board?

                   

                Thanks!

                • 5. Re: if the board has been burned out
                  user_14586677

                  Was the 741 output  pin attached to the PSOC ? Or the PSOC pin

                     

                  attached to an input of the 741 thru a R ?

                     

                   

                     

                  A schematic of connections would help.

                     

                   

                     

                  Regards, Dana.

                  • 6. Re: if the board has been burned out
                    @qq.com.4

                      The PSOC pin attached to an input of the 741 .

                    • 7. Re: if the board has been burned out
                      user_14586677

                      Without a schematic of connections hard to help you.

                         

                       

                         

                      But consider taking a DSO scope, and look at startup transients

                         

                      on pin from 741 connected to PSOC. Set DSO to one shot trigger,

                         

                      trigger level close to ground, and look at the input as well as the

                         

                      741 power rails. What you are looking for is a transient at 741 input

                         

                      that would violate PSOC input levels.

                         

                       

                         

                      Not all 741's are same internal design, in terms of CMOS or Bipolar,

                         

                      and internal protection circuits. Additionally parasitic structures.

                         

                       

                         

                      Regards, Dana.