Cm4 94v0 Schematics · Hot

CM4 connectors have many GND and power pins. Your schematic must show 0.1µF and 10µF caps near each power pin pair.

| Block | Critical Details | |-------|------------------| | Power | 5V @ 2.5A+ (peak), good decoupling (100nF + 10µF near each CM4 power pin). Use PMIC like DA9061 or MPM3630. | | HDMI | ESD protection (e.g., USBLC6-2). Keep differential pairs <2mm length mismatch. | | USB 2.0 | 22Ω series resistors, common-mode choke (optional but wise). | | PCIe (if used) | AC coupling caps (0.1µF) on TX lanes, reference clock routing. | | MIPI DSI/CSI | Strict impedance control (100Ω diff). Length matching within 0.5mm. | | SD Card (if on carrier) | Pull-ups on CD/DAT3, series resistors on CMD/CLK. | | ETH (if using CM4’s PHY) | Magnetics with center tap decoupling. |

Include the following functional blocks in the carrier board schematic:

  • Power supply

  • Clocking

  • USB

  • Ethernet

  • PCIe (optional)

  • Video

  • Storage

  • I/O and level shifting

  • Reset, BOOT, and EEPROM

  • Power distribution and protection

  • Mechanical and thermal

    • Though not in schematics, 94V0 layouts require impedance matching. Schematics will specify:

    The CM4 moves the CPU, RAM, eMMC storage, and power management ICs onto a single, compact 55mm x 40mm board. It connects to the outside world via two high-density 100-pin connectors (J1 and J2). It is designed for scalability—from 1GB to 8GB RAM and from Lite (no eMMC) to 32GB storage.

    If you are creating your own carrier board: cm4 94v0 schematics