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LDC1612: Detecting small targets with LDC1612 or FDC1002

Sami Lakka76
Prodigy 220 points
Part Number: LDC1612
Other Parts Discussed in Thread: FDC2212, FDC1004

I'm evaluating if LDC1612 could be used to detect targets with 3mm diameter. The detection distance is 0-1mm with resolution requirement of around 0.01mm. The max coil size is around 3mm. The WeBench could not find suitable coil solutions for this. Should I look into capacitive measurements instead with FDC1002? The device is relatively well shielded but the inductive measurement would probably be more resistant to outside noise.

  • 0
    TI__Mastermind 23810 points
    You are going to have a hard time getting this to work with that small of a coil. You can use the LDC Tools calculator spreadsheet to do your own estimates. This will help you see which variables will help you (number of board layers, manufacturing constraints, etc.). Capacitive measurements will likely also have a difficult time; however, a capacitive sensor might be quicker and easier to prototype.

    For capacitive sensors, you can look at the FDC2212 or the FDC1004.