The SK5122 is a low power USB and PS/2 combo keyboard encoder with a user-programmable keyboard matrix. The IC can be programmed to any keyboard with four matrix tables for FN and NUMLOCK cases, so the IC is the best choice for custom keyboard solution but with an off-the-shelf IC.
The SK5122 scans and encodes an 8-row by 18-column matrix. The key press events are translated to keyboard and mouse report. The encoder gets matrix information from on-chip flash matrix table. Sprintek provides Windows® application FlexMatrix Editor and Programmer software to edit, download and upload the matrix table.
The SK5122 provides an external PS/2 port that supports hot plug and hot swap of PS/2 mouse and keyboard devices. If the IC is configured to PS/2 interface, then the IC external PS/2 port supports only keyboards. If the IC is configured to USB interface, then the IC external PS/2 port supports keyboards, mice including wheel mice.