I've soldered the AT90USB1286 Chip on a PCB like on this circuit: Imgur
If I measure the pins, caps, resistors etc. with a multimeter, everything seems to be powered and fine. Reset button pulls to ground. And yet, the computer doesn't recognize any USB device when I plug the USB cable in.
I've tried it on Mac and a Linux PC. lsusb doesn't show anything new after plugging in. Same goes for Mac.
Does anyone have an idea how to troubleshoot this? How to get this chip recognized over USB? Thanks a lot.