FDC2114: Data for smaller Sensor Area

Hello

Thank you for your answer.

My understanding is that the are is important, so that 1cm x 1cm equivalent to 0.5cm x 2 cm, correct?

Also thank you for the advice, but from the structural restrictions, we need to place the frame near the sensor.  It is Digital Ground.

At that case, to compensate the decreasing sensivity, we might need to increase the sensor size, correct?

(note: the GND electrode underneath of the sensor is not counted as the cause of sensitivity reduction??)

Thanks

Hello,

Yes, it is the overall sensor area that is important, so 0.5cm x 2cm would be an equivalent sensor.

Increasing the sensor size will increase the sensitivity, but this may not be enough to overcome nearby capacitance to GND if it is very high. 

Could you clarify what you meant by the GND electrode? You should not have a separate GND electrode.

Best Regards,

Hello,

I haven't heard from you in a while, so I'm assuming you were able to resolve your issue. If this is not the case please feel free to reply to this thread or post a new question.

Best Regards,

Hello

sorry Maybe I made mistake, I feel like I saw GND electronde underneath of the sensor electrode....

But I could not find what I have seen... sorry.

Could you please let me know the page where I can simulate the relationship between sensor area and sensing distance?

I think there was two area to fill for the sensor area.

Thank you

Best regards,

Masaharu Matsumoto

Hello Matsumoto-san,

You can use FEMM to simulate electrostatic problems. It's open-source software available here, and there are guides for electrostatic problems. If you are trying to sense the presence of a human, I suggest using a large water target in the simulation.

You may have seen some documentation which shows a shield electrode layered with the sensor electrode. This is only for the FDC1004, which has an active shield driver, unlike the FDC2214.

Best Regards,