How to troubleshoot ? PC can't find USB device from AT90USB162 bootloader

Hi All,

I am quite a newbie on MCU projects and just followed a schematic to integrate an AT90USB162 to an IC.

As it has USB bootloader, I connect the IC to my PC and nothing happened. The PC cannot find even an unknown device from the USB ....

How would you do the troubleshooting ??

A bootloader isn't a HID device... You need a software host ( programmer ) to identify the device...