5 Replies Latest reply on Sep 17, 2018 2:47 AM by BragadeeshV_41

    CY8C4025 pin jammed on some Cap Sense Pins

    desmond.tan_1900321

            Hi All,

       

            Please help to advise.

       

            I am using CY8C4025 and wants to simulated button jamming

            (e.g. paste a piece of copper foil over certain button) condition and

            we found some of the buttons are unable to recovered from the

            “jam” condition after CapSense_InitializeAllBaseline.

       

            Flow as below:

      1. Paste a copper foil over one button
      2. All buttons are not responding when pressing
      3. Triggered CapSense_InitializeAllBaseline
      4. All buttons are responding except the one with
        copper foil.

       

      Condition d only happen for below mentioned
      ports. The rest are able to respond even with copper foil over it.

                    
      P0[5], P0[6], P2[1], P3[0], P3[1], P4[1], P4[2]

      Q1) We would like to know if there is a difference over those ports compared

      to others.

       

      Q2) If there isn’t a difference in terms of CapSense, what are the possible

      cause in design resulting it?