2023-10-12 09:21 AM
so my school has an old pcb milling machine that i want to bring back to life, so the first thing i want to do with it is to make a stm32f103c6t6a board, can someone check if that schematic could work and if i can implement other capabilities in this board?
ps (the pcb milling machine is a lpkf protomat s42 that uses boardmaster and some old version of circuitcam)
2023-10-19 07:04 PM
Additional resistors would actually make it worse and out of specification.
AN4879 rev 6, section 4 "FAQs":
Q: According to the USB specification (FS driver characteristics), when the full-speed driver is/is not part of a high‑speed capable transceiver, the impedance of each of the drivers must be in the range 40.5 to 49.5 Ω/28 to 44 Ω, respectively. Are the STM32 devices embedding these matching resistors?
A: Yes. On the internal USB PHYs, the matching output impedance is already embedded in the pad transceiver and is in line with the USB specification. No external resistors are needed.
2023-10-20 02:49 AM
Thanks for this notice!!