Capacitive Keypad help needed

DaC_1685686 · ‎Sep 18, 2017

Hi,

First of all thanks to help with previous project on this community page i had a successful product.

I have a new project with a capacitive keypad that i am trying to use my cypress development board with.

I have managed to get the software to work with the keypad but i am getting a lot of cross talk between buttons close together.

I have plugged the outside trace into the ground but i have a feeling i am supposed to be doing something different than plugging into ground.

can someone please tell me am i supposed to be doing something different with this outside line that goes around all the buttons.

Thanks in advance.

VenkataD_41 · ‎Sep 18, 2017

Hi,

Can you please share your project gerber files to review?

Are you using Self capacitance method or Mutual Capacitance method? Which CapSense component version you are using?

Are you able to see the SNR of each button in the keypad in the CapSense Tuner GUI? If yes, could you please tell that?

Try with software tuning of CapSense method i.e. mentioned in the document obtained from the link below if you are using the old version of CapSense component i.e CapSense CSD v2.60 or lower. You can also get information regarding how to measure SNR in the following document using Ca[pSense CSD.

http://www.cypress.com/file/52651/download

If you are using latest version of CapSense component please let us know.

Thanks and Regards

Ganesh

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Capacitive Keypad help needed

Capacitive Keypad help needed

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