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making my own board from scratch (literally)

RDR102
Associate II

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)

11 REPLIES 11

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.

Thanks for this notice!!