PS/2 click

PS/2 click is a cost-effective solution for adding keyboard and mouse connectivity to your design. It features a standard 6-pin Mini-DIN PS/2 connector, a mikroBUS host socket, and a power indicator LED. PS/2 click communicates with the target board through mikroBUS RST (data) and CS (clock) pins. It's designed to use a 5V power supply only.

5V power supply, according to PS/2 standard specification.
PS/2 connected keyboards support full N-key rollover. It's the ability of the keyboard to handle any number of simultaneous keystrokes.