An embedded tri-CCD color linescan imaging system based on USB 2.0 interface

A solution is proposed in the design of an embedded high-resolution linescan imaging system based on TCD2252D tri-linear color CCD. The USB 2.0 interface based on CY7C68013 controller is selected with the high data transmission speed up to 96 Mbps. One EP2C50 FPGA chip is applied as the logic control center, in charge of CCD driving, A/D sampling and USB interface buffer control, etc. The synchronous triple FIFO buffering mechanism is used to resolve real-time color disorder correction without changing original optical system, omitting traditional expensive RGB color separation beam splitter. Some other key design technology is also illustrated about how to implement the control logic mentioned above inside the FPGA, such as multi-channel data sampling, multi-channel synchronous transmission control, and colorimetric correction processing etc. The test result shows that this solution is quite feasible and effective.