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LDC1612 / staple detection

K.Yaita
Guru 29690 points
Other Parts Discussed in Thread: LDC1612

Hi Team,

I am evaluating staple detection with LDC1612 and customized coil.
It seems it can detects staple and paper clip well, but one question arise in this evaluation.

I saw oscillation frequency (raw output data of LDC1612) reduced as staple approaches the coil.
I have thought oscillation frequency increases as conductive target approaches the coil, however it actually shows opposite.
Can it detect correctly?

I would like to have your advice.

Best Regards,
Yaita / Japan disty

  • 0
    TI__Genius 13650 points
    Hello Yaita-san,
    which oscillation frequency are you using?
    The response is frequency dependent, and if you have a highly permeable metal and are operating at a very low oscillation frequency, then you would see the frequency go down when a staple approaches.
    In case of staple detection applications, we actually recommend a low oscillation frequency to get the maximum response (around 500kHz), so the outcome that you are observing is expected.
  • 0 in reply to Ben Kasemsadeh
    Guru 29690 points

    Hi Ben-san,

    Thank you always for your support!
    I have used LC oscillator with oscillation frequency about 480kHz and I understood the outcome is expected.

    However I couldn't catch why the response is frequency dependant as you said..
    Is there any application note or information about it?
    ----------------------------------------------------
    The response is frequency dependent, and if you have a highly permeable metal and are operating at a very low oscillation frequency, then you would see the frequency go down when a staple approaches.
    ----------------------------------------------------

    Best Regards,
    Yaita