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Guidance on hardware for TSI

Question asked by Marco Aurelio P. Coelho on Jul 21, 2014
Latest reply on Jul 24, 2014 by Jose Alberto Reyes Morales

We are developing a keyboard for electric ovens, using the MC9S08PT60 TSI.


We took a look at the app note AN3863 and saw some grounding and shielding tecniques.


And we are wondering what are the best tecniques for this kind of application:


1) No grounding or shielding over electrodes area


2) Only shield nearby electrodes


3) Only hatch ground plane on the bottom


4) Both


Could anybody give us some advice, tips, etc?


Note: It is an ordinary 12-key keyboard with acrylic overlay. All the system is integrated in one 2-layer board.