SK5220 - Ultra-Low Power, User-Programmable SMBus (I2C) FlexMatrix™ Keyboard Controller with 8x16 Scan, External PS/2, PWM Backlight, 9 LEDs Control, and Field-Upgradable Bootloader
Overview
The SK5220 is an ultra-low power (0.3uA) SMBus 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 SK5220 deploys Sprintek FlexMatrix™ technology for users to upgrade firmware in the field.
The SK5220 scans and encodes an 8-row by 16-column matrix. The key press events are translated to keyboard event report.
The SK5220 provides command-controlled PWM for backlight LED PWM brightness control.
The SK5220 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. The host can send commands via SK5220 PS/2 command relay feature to the external PS/2 device to change default settings.
Features
- SMBus v1.1 (or I2C) interface
- PEC CRC enabled communication
- Bootloader for firmware 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
- 8 x 16 matrix keyboard scan
- Advanced ghost key detection algorithm to maximize the key combination without additional diodes
- PS/2 command relay support
- 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: 2.2 to 5.5V
- Industrial temperature range: -40°C to +85°C
- Custom versions available in small and large quantities
