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LDC1612EVM / Use non-original coil

S.Satoshi
Guru 21685 points
Other Parts Discussed in Thread: LDC1314, LDC1312, LDC1612, LDC1614

Hi,

Please let me ask the setting when we use non-original coil. I know that the indicator LED show red when non-original coil is used. Then can I change resister setting when non-original coil is used? Please let me know which parameter should be adjust on GUI.

Best Regards,

Sonoki / Japan Disty

  • 0
    TI__Genius 13650 points
    Hello Sonoki-san,
    when replacing the default sensor with a custom sensor, please adjust IDRIVE, the DEGLITCH bandwidth, and SETTLECOUNT to your new sensor characteristics.
  • 0 in reply to Ben Kasemsadeh
    Guru 21685 points
    Hi Ben,

    Thank you for your quick response. Please let me ask more about DEGLITCH bandwidth.
    In case of using different coil at each channel, I think that DEGLITCH bandwidth should be set to the channel of higher oscillation frequency because DEGLITCH bandwidth is common for all channel. Then DEGLITCH bandwidth will be far from another channnel.

    So I'd like to know the impact when DEGLITCH bandwidth is not set to close to oscillation frequency correctly.

    Best Regards,
    Sonoki
  • 0 in reply to S.Satoshi
    TI__Genius 13650 points
    Hello Sonoki-san,
    the DEGLITCH low-pass filter removes high-frequency noise above the bandwidth. You are correct; there is only one setting for all channels combined. If your channels operate in different frequency bands, then you need to set the DEGLITCH bandwidth to the higher setting.

    For example, if CH0 oscillates at 2MHz (1MHz-3.3MHz band) and CH1 oscillates at 7MHz (3.3MHz-10MHz band), then DEGLITCH should be set to b101 (10MHz cut-off).

    The DEGLITCH helps a lot in improving EMI susceptibility when using long wires for remote sensing.

    Please also refer to the inductive sensing FAQ e2e.ti.com/.../295036.aspx Question: "Why do I see spikes in the output of LDC1312, LDC1314, LDC1612, or LDC1614?"
  • 0 in reply to Ben Kasemsadeh
    TI__Genius 13650 points
    Hello Sonoki-san,
    an alternative method from the proposal in my last comment is to change DEGLITCH value before each conversion to the optimal setting for the sensor that will perform the next conversion.
    However, this is only necessary in rare cases (systems that require different channels to operate at different frequency bands AND long cables are used, AND lower frequency band sensor doesn't meet EMI immunity requirements).

    In most systems, setting the DEGLITCH value to the higher frequency band is sufficient.