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FDC2214: Capacitive and inductive sensor using fdc2214 and ldc1614

KIM JINSOL
Prodigy 70 points
Part Number: FDC2214
Other Parts Discussed in Thread: LDC1614,

The above electrode simultaneously measures capacitance and inductance through fdc2214 and ldc1614.

The elliptic metal plate inside the coil is connected to fdc2214 and the coil is connected to ldc1614.


Will interference occur when two electrodes coexist on a PCB?

 

  • 0
    TI__Expert 7589 points

    Hello User,

    Thanks for your post. I have looped in our expert to get back to you on this.

    Arjun

  • 0 in reply to Arjun_Prakash
    TI__Genius 17440 points

    Hello,

    Unfortunately these two sensors will interfere with one another. The capacitive electrode forms an area for eddy currents to form when the inductive sensor's coil is driven. This will make the sensor coil much less sensitive to the intended target. There should be no copper pours in close proximity to the sensor coil. This is discussed in section 10 of the datasheet.

    In addition, if the sensors are operated at the same time and their sensor frequencies are too close, then the measurements could interfere with one another and generate noise.

    Best Regards,