Zeta designed a breakout board for the Silabs C8051F320 microcontroller. A nice feature of this uC is that it doesn’t require external crystal to support full-speed (12Mbps) USB.
The C8051F320 is a nice chip it needs only 4 Capacitors to work. It comes in a hand solderable QFP32 package (0.8mm pitch). It has an internal LDO that can supply 100mA to power external devices and needs no Xtal. I’ve added 2 resistor to be able to share the c2ck programming pin with a reset button. Unfortunatelly the pin layout is probably thought to be used with male type USB connectors so by using mini-B female connectors I’m forced to do weird routing of the USB signals.
Via the forum.