I'm working on a custom board. After connecting the USB cable, Windows displays a  "USB Device not recognized" message. In device manager, the VID/PID pair are both 0000. I checked this by reading the "Device Instance Path" field. 

I checked the steps given in AN15456. I've checked all the voltages and they are all fine. The rest and Wakeup pins are also correctly set (Wakeup is pulled high). I am also getting the 12 MHz output wave on CLKOUT. The application note suggests that since Wakeup is high, SDA and SCL should be pulled up, which is also done. I do not have an EEPROM on the board so this matches the initial test sequence in the application note. Yet, I cannot get the chip to enumerate. 

Is it possible that this is a problem with the chip itself? Should I replace it? Or am I missing something simpler?

Hi,

     Please create a tech support case (MyAccount -> MyCases) so that one of our engineers can review your schematic.

Thanks

Prajith

If you use USB in High speed, make sure the power supply of USB interface is in good quality, using effective filter.

 OK I think the problem was with the crystal I was using. I used a function generator and the device enumerated correctly.

Thanks.