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MSP430FR2532: CapTIvate design with polycarbonate overlay

paddu2017
Expert 2885 points
Part Number: MSP430FR2532

Hi,

We would like to know if there is any data with regard to CapTIvate
based design using poly-carbonate overlay.

Our customer's application will be using MSP430FRxx(CapTIvate) for
a touch button. Number of touch button is just one, so we are not worried
about the cross talk between buttons, but we are worried about the Air gap
between the electrode and the overlay.

Please let us know if there is any details or recommendation about the
air gap between the electrode and the overlay. How much it may effect on the
overall performance and if there is any past results from TI.

Regards
Paddu

  • 0
    TI__Guru**** 202096 points
    Hi Paddu,

    Please refer to the Design Guide -> Best Practices -> Mechanicals -> Other Situations -> Gaps section of the CapTIvate Technology Guide: software-dl.ti.com/.../index.html

    Air has really low dielectric constant and therefore does not pass the electric field very efficiently, theoretically the sensitivity for 1mm air gap without any moisture will be similar to 8mm thick glass. When the gap is in excess of 2 mm, then a conductive extension (either foam or metal) should be used to bridge the gap and keep air from drastically affecting the sensor performance.

    Regards,
    Ryan

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