The SK5222 is an ultra-low power (0.1uA@3V) HID over I2C interface keyboard encoder ASIC with 1 PWM backlight and 4 LEDs control. The failure-safe bootloader design allows the SK5222 to still have full keyboard functions even when any interruption failure happens during the firmware update. It’s the best choice for customized keyboard design for battery powered tablet / laptop / docking station / Instrument.
The SK5222 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.
The SK5222 provides one key-controlled and command-controlled PWM for backlight LED PWM brightness control. An IO pin BLEN can be used to turn off the backlight circuit totally. When BLEN is used, the keyboard scan will be 8-row by 19-columns.