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FDC1004: Maximum capacitance can be eliminated SHLD1/2

Kazuhiko Hirano
Genius 15388 points
Other Parts Discussed in Thread: FDC1004

Hello,

At FDC1004, by using SHLD1/2, up to how much capacitance (any capacitance to ground on signal path between the FDC1004 CINn pins and sensor) can be eliminated? Any maximum number or the unlimited capacitance could be eliminated?

Best regards,

K.Hirano

  • 0
    TI__Expert 7400 points

    Kazuhiko:

    If I understand your question correctly, SHLD1/2 can eliminate up to 400pF of capacitance. This capacitance is dictated from the coupling between SHLD1/2 to GND which depends on the SHLD and GND sensor area. If it is over 400pF, then our FDC1004 cannot drive the SHLD properly (becomes weak), and shielding with degrade and become less ineffective.

    Thanks

    -David Wang

    Capacitive Sensing Applications