SK5120 USB Programmable Keyboard Encoder IC |Sprintek

Overview

The SK5120 is a low power USB 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 IC operates under low voltage 3.3V and can interface a low voltage (3V) PS/2 mouse such as touchpad to minimize the system power consumption.

The SK5120 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 SK5120 provides an external PS/2 port that supports hot plug and hot swap of PS/2 mouse including wheel mouse, and keyboard devices. It is ideal to work with touchpad or pointing stick PS/2 mouse encoder for new architecture laptop/netbook computers.

Features

USB 2.0 full speed
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 PS/2 command pass-through via USB port
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: 235 uA (USB suspend) and 4.6 mA (USB operation)
Operating voltage: 3.15 to 3.45V and 4.35 to 5.25V (pin selectable)
Commercial range: 0°C to +70°C
Custom versions available in small and large quantities