We are trying to use the MPR121 in our next iteration of a product. Unfortunately the auto-configuration is much too slow (>10 seconds of wait time) to make this touch controller usable. It almost seems like every zone must be pressed for the auto-configuration to complete, and all zones are not usable until the auto-configuration finishes.
I tried to set the registers manually based on the result of a successful automatic configuration but the chip doesn't seem to allow me to set the CDCx and CDTx registers. The values do not seem to change.
Does anyone have a default configuration to use that does not rely on the auto-configuration. Currently all my attempts at configuring the controller manually have not worked.