AnsweredAssumed Answered

about touch pad layout of MPR121 touch sensor IC

Question asked by Hak Jin Jeong on Feb 23, 2015
Latest reply on Jun 11, 2015 by Jose Alberto Reyes Morales



I am using MPR121 touch sensor IC.


According to your application note( AN3747- Pad layout application note),

Traces for capacitive sensors should never be routed under other electrodes.


My PCB is not so big, I have difficulties in layout design.


My questions are those.


1) Can I route other traces (not for electrodes) under the electrodes?

    - like LED controls lines (low frequency signal)

2) also can I put components like resistors/capacitors under the electrodes?


Thank you for yout help in advance.


Best Regards

Hak-Jin Jeong