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FDC2114: Measuring Capacitance and Inductance with FDC2114

Kaushik Jayaram
Prodigy 20 points
Part Number: FDC2114
Other Parts Discussed in Thread: LDC1312, LDC2114, LDC3114, LDC1614

Hello,

Since the FDC2114 uses a resonant LC tank, and the resulting resonant frequency to measure capacitance, could I in theory place an inductive sensor coil in series with the L in the LC tank to measure inductance? Obviously I would need to use a different formula to back out what the inductance is, but it seems like the method would work.

This would be really neat since I could use some channels for measuring capacitance, and others for measuring inductance.

Cheers,

Parker

  • +1
    TI__Mastermind 35575 points

    Kaushik,

    In theory your proposed approach could work, but the devil will be in the details, like making sure the Q and are high enough.

    An easier way might be to use an inductive sensor, also based on resonant circuit.
    That will allow you to estimate the inductance directly.
    Parts like the LDC1312/1612, the LDC2114 and LDC3114 might be good candidates, depending on your requirements.
    You can find out more about these parts at the Inductive Sensing FAQ page, as well as the related Inductive Sensing Blogs.

    Regards,
    John

  • 0
    Prodigy 20 points

    Thanks John!  I'm also planning to use the LDC1614 in another application, but just thought it would be neat to use one IC to perform both capacitance and inductance measurements simultaneously on different channels. Will likely give it a try and let you know if it works out!

    Cheers,

    Parker