3 Replies Latest reply on Mar 25, 2012 10:47 PM by zohair.ahmad

    Custom hardware, cannot enumerate, VID/PID=0x0000

    zohair.ahmad

      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?