Using Rockchip SOM module transfers most high‑speed risk to module vendor. But carrier board (base board) design still strongly impacts whole system stability, EMC performance and long‑term reliability. Many project failures root in poorly designed carrier board, even when the SOM itself works perfectly on evaluation kit.
Power integrity is number‑one priority. Rockchip SOM modules draw peak current during boot‑up and NPU working status. Make sure main power input traces have sufficient copper width, keep power loop short. Add proper bulk capacitor and high‑frequency decoupling capacitors near SOM connector power pins. Avoid voltage drop or ripple when current spikes.
Connector layout rules: Place SOM high‑speed interface signals (PCIe, USB3, MIPI) away from switching power supply circuits to reduce crosstalk. Route differential pairs with controlled impedance. Do not run high‑speed traces parallel to switching power tracks.
Thermal consideration: Leave sufficient copper area and thermal vias under SOM connector region for heat dissipation. SOM transfers part of heat through connector toward carrier board. Avoid placing electrolytic capacitors or temperature‑sensitive components right beneath the SOM module.
Isolation and EMC: Separate high‑power switching circuit and weak‑signal analog circuit on PCB. Keep solid and complete ground plane. Add TVS protection for external interfaces such as Ethernet, RS485, USB, to prevent ESD damage in industrial environment.
Before mass production, run full stress test: wide‑range voltage input test, high‑temperature aging, ESD surge test. Do not only validate basic boot and function in lab environment.
Good carrier‑board design maximizes the advantages of Rockchip SOM, helps you avoid unexpected hardware revision after prototype phase.
