The development process for a single-board computer based on the Rockchip RK3568 processor involved a complex architectural approach. The engineer chose this chip over the RK3399 for its modern configuration and extensive interface options, aiming for maximum versatility in the final design.
The hardware design required a 10-layer PCB structure, necessitated by the specific power architecture of the RK809-5 PMIC. This component requires up to six separate power lines for the core voltage alone, resulting in 20 distinct power rails that consumed significant board space.
The processor features multifunctional pins with complex multiplexing options, including ten UART controllers with multiple M0/M1/M2 configurations. The board supports single-channel LVDS output at 1280x800 resolution at 60 Hz, utilizing the integrated MIPI DSI TX0/LVDS TX PHY.
The final PCB design uses FR4 High-speed materials with immersion gold finish and 0.5 oz copper thickness. The processor has a 0.65 mm pin pitch, and the system consumes approximately 5W under load, which is managed via passive cooling.
