28 GPIO pins available, supporting various functional multiplexing (PWM, SPI, I2C). Where to Find Official CM4 Schematics

If you are looking for the technical schematics, footprint data, or design files for the CM4, you are actually seeking the official Raspberry Pi CM4 IO Board Datasheet or open-source CAD files. These resources provide the exact pinouts, power distribution, and connectivity specs to bring custom hardware designs to life.

A production-grade 94V0 design includes:

: The material cannot drop flaming particles that might ignite the surrounding environment .

If using the Wi-Fi/Bluetooth enabled version (CM4xxxxxxW), you must plan for either the onboard antenna or a U.FL connector on your board, with proper clearance in the schematic.

If your board has "94V-0" printed on it alongside a CM4 module, but it does not look like the official IO board, it is a third-party carrier board. Follow these steps to find its schematics:

(Broadcom BCM54210PE) which only requires a standard 1:1 RJ45 MagJack in the carrier board design. I/O Interfaces PCIe Gen 2 x1 interface for high-speed peripherals. ports supporting up to 4K resolution at 60fps. MIPI CSI-2 camera and dual display interfaces. Power Requirements : Simplest designs require only a +5V supply

Ensure your carrier board does not exceed the total 3.3V power budget provided by the CM4 module.

for all I/O, requiring precise footprints in your schematic. Networking : Integrated Gigabit Ethernet PHY

The official acts as a reference design, showing how to break out the high-density connectors of the CM4 into usable interfaces like USB, HDMI, Ethernet, and PCIe.

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When working with the CM4 94V0, several design considerations are crucial:

Traced directly to a PCIe slot, an NVMe M.2 slot, or an onboard USB 3.0 controller chip (like the VL805).