6 Replies Latest reply on Aug 25, 2017 8:00 AM by e.pratt_1639216

    SWD Acquire Error on CY8C4014LQI-422

    michael.beaster_1625561

      I have a new board design using the CY8C4014LQI-422 24-pin QFN. We built a few dozen boards and I'm unable to get the MiniProg3 to communicate with any of them. I noticed that I had VCCD connected to VDD (the datasheet on page 7 calls pin 6 VCC rather than VCCD - it's easy to assume this is just another power pin so it might be a good correction to make in the datasheet). I also left the big center pad floating rather than grounded. I plan to change these issues in the next board spin but I made these changes on a couple boards and they still won't communicate. I'm hoping an expert might look at my schematic/layout and see something obvious that I missed (other than the VCCD issue). I've tried powering the board externally and via the programmer, and at many different clock speeds to no avail. It seems to me that there is no 1.8V output on the VCCD pin -  I thought I replaced the part with a new one when I did the rework. If not, could the part have been damaged by the previous faulty power scheme?

       

      I've developed with PSoC4 parts on several designs in the past and haven't encountered this so I'm at a bit of a loss. I'd rather not post my design files here so if someone does have the ability to look at it, let me know and I can send them.

       

      Thanks.