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LDC3114: Hole in the center of the coil

Danilo A.
Mastermind 26280 points
Part Number: LDC3114

Hi Team,

We are seeking your help regarding our customer's inquiry below.

I have a question regarding the PCB coil design for LDC3114. I am using the provided spiral inductor designer.

The intended design is for the PCB to have a hole in the center of the coil. The metal part, which presence is to be detected (It a a standard  1/4" hexagonal screw bit), will go all the way through the PCB instead of just approaching the PCB. The other state is the complete absence of the bit. We just need to determine a boolean state present/not present.

I would expect this to make the sampling even easier, but I'd like to double check with TI if there are any reason to make this unadvisable as the technical documentation never mentions such a case.

Regards,

Danilo

  • +1
    TI__Mastermind 18545 points

    Hello Danilo, 

    Is there any other metal around the coil in this application or will it just be the bit? 

    The presence of metal in the middle of the coil will cause a change in the LDC output, but other metal around the sensor coil could decrease the amount of change you get for the intended target. 

    Best Regards, 

    Justin Beigel