This is my first post here. I'm looking for an equivalent of MPR121 but couldn't find ti after lots of searching. Can someone point me to the 16channel version?
As I mentioned here the MPR121 counts with up to 12 electrodes/capacitance sensing inputs.
However, When the number of keys exceed the available sensor channels, multiplexing or logical combinations can be created.
In order to get more information, please refer to the AN3863 especially at chapter 4.1.2.
If I misunderstood your question, feel free to let me know. I will be glad to help.
Have a great day.