I would point out that for the Pico (RP2040) and Pico 2 (RP2350) in particular, there's not only a datasheet, but also first-party tutorials that walk you throu

I would point out that for the Pico (RP2040) and Pico 2 (RP2350) in particular, there's not only a datasheet, but also first-party tutorials that walk you through laying out a minimal reference board design: Pico 1 (RP2040): https://pip.raspberrypi.com/documents/RP-008279-DS-hardware-design-with-rp2040.pdf https://pip.raspberrypi.com/documents/RP-008279-DS-hardware-... Pico 2 (RP2350): https://pip.raspberrypi.com/documents/RP-008280-DS-hardware-design-with-rp2350.pdf https://pip.raspberrypi.com/documents/RP-008280-DS-hardware-... These tutorials in turn contain links to KiCad schematics + layout files for the boards they walk you through developing, for you to check your work against.