what are other column-row configurations for matrix PCB layout supported by MPR121, other than what is in AN4600?
In other words, can I design 4 columns (ELE0-ELE3) and 8 rows (ELE4-ELE11)?
AN4600 recommends block size 3.5 - 4.00mm. is that side dimension of the block?
What is the max thickness of cover for the sensor?
Is cover must be adhered to PCB?
Can there be air gap between PCB and cover?