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LDC1614 question

Manuel Loo
Prodigy 70 points
Other Parts Discussed in Thread: LDC1614

Hello,

I have a question regarding the LDC1614.  I started out testing the LDC1000 I decided I needed more sensing distance (approximately 3cm) on a target that is 1cm in diameter.    

Using the LDC designer, it produced a design for a coil that was about 6.4mm in diameter which would fit my requirements.  However, from the inductive sensing design guide, I read that the the sensing distance should be the diameter of the inductor, which is a bit confusing.  Can you shed some light on this area?

Also, I eventually want to to have an array of these coils printed on a board and use to sense multiple targets.  I wanted to ask if there would be interference between the the coils if they are in close proximity.   Additionally, does the inductive sensing area restricted to the area of the coil or does it fan out as the target is further away?

And the last thing, the LDC1614 seems to only sense really small changes with the coils it comes with, is this how it is supposed to be?

Thank you

Manuel

  • 0
    TI__Genius 14270 points
    Hi Manuel,

    Yes, it is possible to get interference from adjacent coils; the LDC1614 reduces the effect significantly by shorting out the inactive channels. If you are having problems, you can shift the resonant frequencies by 10%+ by using different Csensors.

    The farthest axial sensing range is reached with the target directly over the coil.

    Please clarify your last question.

    Regards,

    ChrisO