A boost converter is required on the 5-V power supply. With the current schematic, if a 5-V voltage is applied to VEXT, 4.6 V is seen on VCC5 because of the threshold voltage of D1.
The Qtouch sensors should be placed on the back of the board to prevent unexpected event (pressed keys are not seen, released keys are seen are pressed). Workaround: a rubber tape has been mounted on the touch sensor area.
The QTOUCH QT60168 device DRDY pin (output for the QT60168) is connected to PX11. PX11 is also used as an output from the AT32UC3A3256 to the SDRAM (DQHM). Workaround: Do not use QT60168 and SDRAM at the same time.