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LDC1000: Sine wave output data

masahiko shimizu
Guru 11235 points

Part Number: LDC1000

Hi,

My custmer is thinking about using LDC1000.
He wants to use LDC1000 as position detection.
Please see the below picture.
Objest of customer sysytem has sliding motion as below.
and Customer wants to get the position information as sine wave.

Could you propose the metal shape for sine wave, please?

Best regards,
Shimizu

  • 0
    Guru 11235 points
    Hi,

    How is the progress about this question?

    Best regards,
    Shimizu
  • 0 in reply to masahiko shimizu
    TI__Genius 13335 points
    Hello,
    The shape that is shown in the drawing will produce a saw tooth waveform if moved from left to right. You will need to mirror the target to create a symmetric shape to get a full increasing/decreasing waveform. The shape of the target will determine whether the inductance response from the LDC will be either be linear, sinesoidal, or some other shape. Refer to the linear position application note (www.ti.com/.../SNOA931) where we've used a triangular target (shown in figure 1) and its output waveform (shown in figure 4).
    We've additionally done testing in rotational applications where we've used the equivalent of a stretched diamond shape to create a sinusoidal shape. You can read more about this design from the following link: www.ti.com/.../TIDA-00508
    We also recommend using the LDC1101 or LDC1312 for this application which have improved resolution which will help with the system-level accuracy and repeatability.
    Regards,
    Luke