Cm4 94v0 Schematics Review

Flame retardancy doesn’t imply electrical robustness. A professional CM4 schematic includes:

The CM4 Lite has no eMMC; it boots from an SD card on the carrier board. cm4 94v0 schematics

| 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. | Flame retardancy doesn’t imply electrical robustness