Posted on May 17, 2011 at 14:12Q) Do you mean you are connecting PA9 directly to USB VBUS (5V)? A) Yes, however my new circuit will have a 1k-ohm resistor and a capacitor to ground. ASCII Art: USB_VBUS ---/\/\/\/\---+---||--- Ground ...
Posted on May 17, 2011 at 14:12I had the same problem. I could not get the bootloader to connect without adding an external pull-up on USB_DP. However the real problem was with the USB_VBUS input on port PA9. My circuit dropped the voltage from +...
Posted on May 17, 2011 at 14:12I was curious if driving +5.0 V DC into PA9 while the microprocessor was powered down might cause a problem. So I gave it a try, but I was unable to damage the chip.
