While the CM-4 provides many more GPIOs than the Pi 4B, most carrier boards expose the standard 40-pin header. Your schematic should:
The CM4 itself is not something you design a schematic for — its internal circuitry is proprietary. Instead, you design a carrier board schematic using the CM4’s official datasheet and hardware design guide . cm-4 94v-0 schematics
: This is a common internal manufacturing code used by PCB fabricators (often associated with the company P&Q ). While the CM-4 provides many more GPIOs than
Take a high-quality photo of the board (both sides) and perform a reverse image search on Google Images or Yandex. You might find a listing on AliExpress, eBay, or a repair forum where someone else has identified the board by a different name. : This is a common internal manufacturing code
: This is a UL (Underwriters Laboratories) flammability rating. It indicates that the plastic/fiberglass board material will self-extinguish within 10 seconds and does not drip flaming particles.