Hi, please advise where I can find a foorprint and/or layout instructions for MPR121. There is lots of info regarding the traces and the electrodes, but I can't find anything about the component itself.
Element 14 has a very useful library for Freescale devices and many other manufacturers. The MPR121 is listed in the Freescale_Library_Components_List.pdf
The library is compatible with CadSoft EAGLE.
The most critical design consideration for the MPR121 is the electrodes, other than that, there is no specific recommendation to design with the MPR121.
Hope it helps,
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