Hi there,
I am using CapSense on a circular board and my aim is to enable wake-on approach from as far away as possible. I have done a first design but I am not totally satisfied yet with the result. Would be great if I could get some additional tips on how to make my design better.
Here is what I have done:
- the board is circular, 133mm in diameter (~5.2 inches) and has 4 layers
- I put the circular sensing electrode (1.6mm/63mil width) on the circumference of the top layer (nothing else on the other layers)
- the driven shield electrode is placed right behind it (1mm/40mil width with 1mm/40mil space to the sensing electrode, circular and on top and bottom layer)
- the rest of the circuitboard (all the components plus guard ring) with 1mm/40mil space behind the shield electrode.
I studied the available pdfs from Cypress and also the schematic and layout of the MBR3 eval kit. Is there something I could do better layout wise to get a longer proximity sensing distance?
Thanks a lot for your help!
Regards,
Josef
