SK5102 - Low Cost USB Programmable FlexMatrix Industrial Keyboard and KeyMouse Combo Encoder with AB Rotary Encoder and PS/2 Pass-through Support


The SK5102 is a USB keyboard and KeyMouse combo encoder with a user-programmable keyboard matrix. The IC can be programmed to any keyboard with four matrix tables for FN and NUMLOCK(or RFN) cases, so the IC is the best choice for custom keyboard solution but with an off-the-shelf IC.

The SK5102 scans and encodes an 8-row by 20-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 SK5102 scans AB rotary encoder inputs then map the rotation events to two key locations in the key matrix.

The SK5102 provides an external PS/2 port that supports hot plug and hot swap of PS/2 mouse including wheel mouse, and keyboard devices.


  • USB 2.0 full speed
  • User-Programmable keyboard matrix, scan code and macro keys
  • 4 sets of 8 x 20 keyboard matrix for Numlock(or RFN) and FN cases
  • N-key rollover support
  • Up to 255 Custom/Macro keys: generate “LCTRL+LALT+DEL”, “000” and “Diet Coke”
  • Built-in KeyMouse
  • AB rotary encoder mapped keys
  • Support PS/2 command pass-through via USB port
  • Key-controlled and USB-controlled 8 general purpose output(GPO), 1 state control output(SCO), 1 backlight PWM, 1 Alert LED control, Blackout controlOne external hot-plug PS/2 port supports PS/2 keyboard and mouse including wheel mouse
  • Support three FN control modes: Level, Toggle and Sticky
  • Support two delay keys
  • 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 56 pin package: 8x8mm 1.0 Max (LxWxH)
  • Low power consumption. 230uA (USB suspend) and 18 mA (USB operation)
  • 4.57 to 5.25V operating voltage
  • Commercial temperature range:0°C to +70°C
  • Custom versions available in small and large quantities

Typical Applications

  • Industrial Keyboard
  • Point-of-sale (POS) terminals
  • Notebook/Netbook PCs
  • Portable devices

Support Software

Click here to download these tools.
FlexMatrix™ Editor
The software is used to generate configuration data (keyboard matrix, macro key definition, scan code definition and other feature control parameters) into a binary file.
FlexMatrix Editor Screenshot
FlexMatrix™ Programmer
The software is used to download configuration data to keyboard controller.
FlexMatrix Programmer Screenshot
FlexMatrix™ Tester
The software is used to test all Sprintek USB and PS/2 keyboard products.
FlexMatrix Tester Screenshot