This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Part Number: FDC2114
I have comfirmed the doc (SNOA940A)
But I would like to know smaller sensor size.
required detection distance : 10cm approx
assumed sensor size : 5 mm x ___mm (GND size is same.)
distance between sensor and GND : 1.0mm
Could you let me know the length of the sensor size?
I cannot read from the graph(Fig.3) due to the range.
I don't have the exact datapoint on the graph, but you should be able to achieve a 10cm sensing distance with an electrode that is roughly 1cm x 1cm, perhaps a bit larger. You may need a larger sensor depending on the size of your target and your noise floor.
Also please note that we do not recommend placing a ground plane or grounded object near the sensor electrode, as this will significantly decrease the sensitivity.
Battery Automotive Products
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
In reply to Kristin Jones93:
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??)
In reply to Masaharu Matsumoto:
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.
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.
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.
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.
Hello Kristine san,
Thank you so much for both simulation software and the FDC1004.
I'm going to play with simulator.
Thank you for your support
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.