SK5221 - Ultra-Low Power Low Cost HID over I2C FlexMatrix™ Keyboard Encoder with 1 external PS/2, 1 PWM Backlight and 9 LEDs Control, Field-Upgradable Bootloader
Overview
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.
Features
- HID over I2C v1.0 interface with Bootloader for field upgrade
- One external PS/2 interface to PS/2 device such as mouse, touchpad, pointing stick, keyboard
- 9 LEDs (4 shared with column scan pins)
- 1 PWM backlight brightness control
- FN key support
- 8 x 20 matrix keyboard scan
- Advanced ghost key detection algorithm to maximize the key combination without additional diodes
- User-Programmable keyboard matrix
- Remap external PS/2 mouse X,Y movement to horizontal, vertical scrolling
- 4 Matrix Tables for LFn, RFn cases, NumLock On/Off cases
- Support macro keys to generate like “Ctrl+Alt+Del”, or “Coke Cola”, “000” sequential string outputs
- PS/2 command relay support
- HID over I2C interface supports commands: RESET GET_REPORT SET_REPORT SET_POWER
- Built-in oscillator and digital circuit. No external crystal is needed
- LQFP 48 pin package: 7x7mm 1.6 Max (LxWxH)
- Low power consumption: 0.3uA (no key pressed)
- Operation voltage range: 2.7 to 5.5V
- Industrial temperature range: -40°C to +85°C
- Custom versions available in small and large quantities
