5 Replies Latest reply on Mar 22, 2019 3:45 AM by ShanmathiN_06

    Capsense Proximity sensing loop design

    almc_4008691

      Hello,

       

      I'm designing a proximity sensor on a pcb.

      The first design I have got is 4 sensors pads ( 20mm*20mm) next to each other and they are used as a proximity sensing which is working ok.

       

      But I wanted to try with a loop trace on the pcb instead of pads which are normally for touching and not proximity sensing?!

       

      Therefore, I wanted to add some hatch pattern on the top and bottom layer ( 2 layers pcb).

       

      Do I need to put a hatch inside the loop?

       

      Also I'm close to a metallic object so which signal should I drive on the top and bottom layer? I'm a bit lost between shield or ground?

       

      Thanks in advance for your time,

       

      Alex