SK5122 Industrial USB and PS/2 Keyboard Encoder IC |Sprintek

Overview

The SK5122 is a low power USB and PS/2 combo keyboard encoder with a user-programmable keyboard matrix. The IC can be programmed to any keyboard with four matrix tables for FN and NUMLOCK cases, so the IC is the best choice for custom keyboard solution but with an off-the-shelf IC.

The SK5122 scans and encodes an 8-row by 18-column matrix. The key press events are translated to keyboard and mouse report. The encoder gets matrix information from on-chip flash matrix table. Sprintek provides Windows® application FlexMatrix Editor and Programmer software to edit, download and upload the matrix table.

The SK5122 provides an external PS/2 port that supports hot plug and hot swap of PS/2 mouse and keyboard devices. If the IC is configured to PS/2 interface, then the IC external PS/2 port supports only keyboards. If the IC is configured to USB interface, then the IC external PS/2 port supports keyboards, mice including wheel mice.

Features

USB 2.0 full speed and PS/2 interface
User-Programmable keyboard matrix
4 sets of 8 x 18 keyboard matrix for Numlock and FN cases
Up to 255 Custom/Macro keys: generate “LCTRL+LALT+DEL” or “000” keys
Key-controlled external PS/2 device lock feature without driver required
Built-in 8 direction KeyMouse
Support one external PS/2 to interface an PS/2 mouse or keyboard
Key-controlled 3 general purpose output(GPO), 1 state control output(SCO), Blackout control
Support three FN control modes: Level, Toggle and Sticky
Supports USB selective suspend and remote wakeup
Built-in oscillator and digital circuit. No external crystal is needed
Windows® application to design keyboard matrix
Low profile QFN 48 pin package: 7x7mm 1.0 Max (LxWxH)
Low power consumption. 265uA (USB suspend) and 5.7 mA (USB operation)
Operating voltage: 4.35 to 5.25V (USB) and 1.71 to 5.25V (PS/2)
Industrial temperature range: -40°C to +85°C
Custom versions available in small and large quantities