FX2 controller sometimes hangs on startup or on demand | Cypress Semiconductor
FX2 controller sometimes hangs on startup or on demand
I have a custom design with CY7C68013a controller. Most of the time the device including software is working well but sometimes it seems that the there is a startup problem.
The problem occurs at random. Sometimes, after power up (without connecting to a PC), it seems that the controller does not start
Sometimes the controller starts and after I connect the USB cable the controller it hangs
I am also able to set this hanging state if I put my finger to the D+ line of the USB.
I already checked:
Oscillator (24Mhz) and 22 pf capacitors
power supply should be O.K.
AVCC is separated from VCC by inductor MLB-160808-0300PN
Does anybody have an idea what the problem could be please?
Friendly regards and thak you for your hints in advance