The SK5221 is an ultra-low power (0.3uA) HID over I2C interface keyboard encoder with 1 PWM backlight and 9 LEDs control. It’s the best choice for customized keyboard design for battery powered tablet / laptop / docking station / Instrument.
The SK5221 scans and encodes an 8-row by 20-column matrix. The key press events are translated to keyboard report. The encoder gets matrix information from on-chip matrix tables.
4 LED pins and 4 column pins are shared pins to meet different applications’ needs.
The SK5221 provides one key-controlled and command-controlled PWM for backlight LED PWM brightness control.
The SK5221 provides an external PS/2 port that supports hot plug and hot swap of PS/2 devices such as touchpad, pointing stick, mouse including wheel mice, and keyboard. The host can send commands via SK5221 PS/2 command relay feature to the external PS/2 device to change default settings.