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Original question:

FDC2212: FDC2212 EMI

FDC2212: solution for wave-hand detection or proximity sensing

Hector Chen
Intellectual 410 points
Part Number: FDC2212
Other Parts Discussed in Thread: OPT3101, FDC1004

Hi TI team,

Do you recommend using FDC2212 for wave-hand detection or proximity sensing?

Any limitations of using FDC2212 for such kinds of applications? 

Thanks.

Hector

  • 0
    TI__Mastermind 26335 points

    Hey Hector,

    The FDC2212 has issues with stray capacitance causing false triggers. As such you would need to devote alot of effort to designing your system such that the stray capacitance is eliminated or reduced.  FDC1004 addresses the stray capacitance issue with active shield driver, yet we typically only recommend that for water level sensing.  A better alternative to consider might be the OPT3101.

  • 0 in reply to Patrick Simmons
    Intellectual 410 points

    Hi Patrick,

    Thanks for pointing out this.

    Do we need to put a lot of effort into designing the shield to reduce stray capacitance?


    Hector

  • 0 in reply to Hector Chen
    TI__Mastermind 26335 points

    Hello Hector,

    According to my colleague, it can be quite challenging if you have not designed one before. Apparently, out of the known attempts, only a very small percentage have actually taken their product to market with the FDC2212 solution.  I personally have not designed with FDC2212 and a lot of our team is out due to the holidays.  When one of our applications support who is more experienced with this device returns from the holidays, I can ask if he might have some tips to share.  In the mean time, this link and this link might give you some ideas for reducing the stray capacitance.  Another thing worth mentioning is that your system ground will also affect detection distance.  If ground is relative to a battery as opposed to earth ground, your possible detection distance will be shorter.