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LDC1614EVM Capacitive Coupling Sensitivity

Edgar Ortega
Intellectual 270 points
Other Parts Discussed in Thread: LDC1614EVM

We bought the LDC1614EVM Module, regardless of the sensor size and component values, we always end up with large unwanted signal swings on the output of the device when my hand comes within an inch of the sensor.

Our test platform has a sensor mounted on a modified micrometer, so when we adjust for 0.001" displacement we can see the actual change inductive change on the GUI.

Touching the micrometer or getting close to the handle causes the swings.

What can I do to elimanate this?

Regards,

  • 0
    TI__Genius 14270 points
    Hello Edgar,

    Using a larger sensor capacitor is recommended for this. Is the sensor placed remotely from the LDC? If you have separated the sensor from the LDC, there are limitations on how far away the sensor can be, based on the sensor frequency (higher frequencies require shorter distances). You can use the remote coil calculator tab on the LDC Tools spreadsheet ( www.ti.com/.../slyc137) to calculate the distance.

    Regards,

    ChrisO
  • 0 in reply to Chris Oberhauser66
    Intellectual 270 points

    Thank you Chris,

    The sensor and LDC are separated, about 3" away, connected with twisted pair 30awg, wirewrap. I will look at the calculator and compare to my values. I post later on about my results.

    Thanks again for the guidance.

    Regards,

    Edgar