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Original question:

FDC2214EVM: Multiple FDC2214 connection

FDC2214EVM: using multiple FDC2214 for proximity sensing/interference

user5904184
Prodigy 90 points
Part Number: FDC2214EVM
Other Parts Discussed in Thread: FDC2214

Hi, 

In my project, I need use multiple FDC2214 sensors together for proximity sensing.

The sensors have to be placed very close.

However, when multiple sensors are activated, the data read by the sensors fluctuate intensely.

I think this might be caused by the sensors were interfered with each other.

What can I do to solve this problem?

  • 0
    TI__Genius 17440 points

    Hello,

    It is possible that the sensors are interfering with each other if they are actively measured at the same time. You can shift the sensor frequencies apart from each other in order to decouple the sensors. Either changing the fixed inductance or the fixed capacitance can achieve this effect.

    Best Regards,

  • 0 in reply to Kristin Jones93
    Prodigy 90 points

    Hi，

    Thank you, Kristin. We will try to shift the sensor frequencies and/or to change the fixed inductance or the fixed capacitance .

    Please have a look at our implementation.

    We place 2 FDC2214 sensors on both side of a cylinder made of aluminum. When only one sensor is activated, the data measured by the sensor is good, but when both sensors are activated, the data fluctuate intensely. 

    Is it possible to add something between the sensors and the cylinder to mitigate the fluctuation of the data?

  • 0 in reply to Kristin Jones93
    Prodigy 90 points

    Hi，

    Thank you, Kristin. We will try to shift the sensor frequencies and/or to change the fixed inductance or the fixed capacitance .

    Please have a look at our implementation.

    We place 2 FDC2214 sensors on both side of a cylinder made of aluminum. When only one sensor is activated, the data measured by the sensor is good, but when both sensors are activated, the data fluctuate intensely. 

    Is it possible to add something between the sensors and the cylinder to mitigate the fluctuation of the data?

  • 0 in reply to user5904184
    TI__Genius 17440 points

    Hello,

    You may be able to shield the sensors, but it would likely reduce your overall sensitivity. I highly recommend separating the sensor frequencies. The LC tank sensors are inherently narrow band-pass filters, so if their resonant frequencies are sufficiently separated they will not affect each other.

    Best Regards,