SK5223 - Ultra-Low Power, User-Programmable SMBus (I2C) FlexMatrix™ Keyboard Controller with 8x20 Scan, PWM Backlight, Upgradable Bootloader
Overview
The SK5223 is an ultra-low power (0.1uA@3V) SMBus v1.1 (or I2C) interface keyboard encoder ASIC with 1 PWM backlight and 4 LEDs control. The failure-safe bootloader design allows the SK5223 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 notebook / netbook / tablet / docking station / Instrument / IO expander. The SK5223 deploys Sprintek FlexMatrix™ technology for users to upgrade firmware in the field.
The SK5223 scans and encodes an 8-row by 20-column matrix. The key press events are translated to keyboard event report.
The SK5223 provides 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.
Features
- SMBus v1.1 (or I2C) interface with get UDID
- PEC CRC enabled communication
- Failure-safe Bootloader for firmware upgrade
- 8 x 20 matrix keyboard scan
- 1 PWM backlight brightness control
- 4 Keyboard LEDs
- Advanced ghost key detection algorithm to maximize the key combination without additional diodes
- Built-in oscillator and digital circuit. No external crystal is needed
- QFN 46 pin package: 6.5x4.5mm 0.9 Max (LxWxH)
- or LQFP 48 pin package: 7x7mm 1.6 Max (LxWxH)
- Low power consumption: @ 3V: 0.1uA (no key pressed) 110uA (1 key) 50uA (inc per Key)
- Operation voltage range: 2.2 to 5.5V
- Industrial temperature range: -40°C to +85°C
- Custom versions available in small and large quantities
Support Software
FlexMatrix™ Editor
FlexMatrix™ Programmer
FlexMatrix™ Tester
