The original question asked the maximum load capacitance that could be driven by the AM335x outputs. This is a question a customer would expect TI to answer, so my answer was with respect to AM335x ability to drive a capacitive load.
I realize the system level answer depends on other variables like the touch screen impedance and expected response time. However, this is something the product designer needs to understand. If the 2200pf capacitive load causes the response time to be too slow, they will need select a ESD protection device with lower capacitance. But this decision is based on system level considerations not AM335 output considerations.
Regards,
Paul