The CM4 itself is a system-on-module that plugs into a baseboard. Raspberry Pi does not release the full, multi-layer schematics for the CM4 module itself to protect their intellectual property. However, they provide comprehensive implementation data:
USB 2.0 Hub, PCIe Gen 2 x1 lane, and standard GPIO headers. 3. PCIe and High-Speed Routing
Raspberry Pi provides official placement blueprints and mechanical drawings for the module. The Official CM4 IO Board
If you are designing a board based on these schematics, pay close attention to these critical areas: High-Speed Differential Pairs cm4 94v0 schematics
Sites like the Waveshare Wiki provide PDF schematics for almost every board they produce.
Another excellent example is the , whose schematic is publicly available at https://tofu.oratek.com/_assets//TOFU-schematics.pdf . This board demonstrates a clean, well‑documented design that includes an NVMe drive and other advanced features.
Waveshare and Seeed Studio are incredibly popular for CM4 projects. The CM4 itself is a system-on-module that plugs
Third-party manufacturers often label their custom carrier boards or clone boards with "CM4" to indicate form-factor compatibility. What does 94V-0 mean?
This write-up explains relevant schematics, safety considerations, and practical guidance for designing PCBs that host a CM4 while meeting UL 94V‑0 expectations.
Most open‑source CM4 designs use because: Another excellent example is the , whose schematic
While "94V-0" refers to the board's material properties, the are what you need for designing custom carrier boards or troubleshooting circuits. The Raspberry Pi Foundation provides comprehensive design files for the CM4 and its official IO board. Design Files - Raspberry Pi Compute Module 4 IO Board
: Burning stops within 10 seconds on a vertical specimen.
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The CM4 is essentially a "stripped-down" Raspberry Pi 4. It contains the core compute elements—the , RAM, and optional eMMC storage—but removes all physical ports. Instead, it uses two high-density 100-pin board-to-board connectors on the underside to expose its interfaces. Key interfaces provided by the CM4 schematics include:
For industrial HMI (Human Machine Interface) devices, video out is critical.