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FDC1004: Component placement

Christopher Forsmark87
Prodigy 10 points
Part Number: FDC1004

Will the sensing performance be affected if i place other components on the opposite side on the PCB of the capacitive sensing area. 

  • 0
    TI__Mastermind 23810 points
    Christopher,

    Components on the opposite side will introduce parasitic capacitances that will affect your sensor. However, the FDC1004 has a way around this with the shielding option.

    If you can connect an internal layer of your PCB (directly beneath your capacitive sensor) to the SHIELD pin of the FDC1004, the effects of components on the opposite side of the PCB should be minimized.

    Read more about how to shield the FDC1004 here:
    www.ti.com/.../snoa926a.pdf