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LDC1000DEMO / Proximitiy data variation

S.Satoshi
Guru 21685 points

Hi Everyone,

My customer just started to learn and evaluate inductive sensor by using LDC1000DEMO. Then they found that the large variation at some point. Please see attached for detail. Please see attached and let me know if this is necessary result or error by test environment.

Your comment will be appreciated.

Best Regards,

Sonoki / Japan Disty

  • 0
    TI__Intellectual 1185 points
    Hello Sonoki-san

    Could you please clarify: By variation in proximity data, do you mean the noise floor/standard deviation at those particular points? So basically, the customer sees code changes of about 100 at no target and full target coverage zones and only 10 code changes at the points in between?
  • 0 in reply to Waqas Haque
    Guru 21685 points

    Hi Waqas Haque,

    Thank you for your comment.

    Yes, I mean the noise floor.

    Best Regards,

    Sonoki

  • 0 in reply to S.Satoshi
    TI__Genius 14270 points
    Hello Sonoki-san,

    The LDC1000 sometimes has a reduced code variation at certain Rp values. In general the higher code variation aligns with the desired operating range.

    Regards,

    ChrisO
  • 0 in reply to Chris Oberhauser66
    Guru 21685 points

    Hi ChrisO,

    Thank you for your comment but I have not yet been fully defined.

    Can I reduce the proximity data variation at pointed red arrow? For example it can reduce by adjusting Rp Maximum or Minimum?

    Can you be a bit more specific about it?

    Best Regards,

    Sonoki

  • 0 in reply to S.Satoshi
    TI__Genius 14270 points

    Hello Sonoki-san,

    Yes, you can reduce the noise floor (standard deviation of the output code) with adjustments to the RPMIN/RPMAX - you would increase the RPMIN value (but keep it below the minimum RP of the sensor) and decrease the RPMAX value (but keep it above the maximum RP of the Sensor). Also make sure the CFB capacitor is properly set. Other things to verify are the layout should be good, the bypass caps should be close to the appropriate supply pins.

    Regards,

    ChrisO