STEVAL-LLL001V1: 5 x 24 LED Matrix with USB Control Board

The STEVAL-LLL001V1 board is designed to demonstrate the features of the STLED524 intelligent matrix LED display driver with a 5 x 24 matrix of SMD white LEDs incorporated on the board. Two boards can also be joined using the on-board connectors to drive a 10 x 24 LED matrix. The board is driven by the USB control board for interface with the graphical user interface (GUI), but there is also an SPI interface connector on the STEVAL-LLL001V1 which can be used for customized control.

The current regulators are supplied through an integrated boost DC-DC converter. The output voltage can be adjusted by an internal register to optimize the efficiency according to the type of LED (with reference to the forward voltage). This helps to reduce the current mirror power dissipation, improving the overall efficiency. STLED524 also contains an internal LDO regulator, which can provide a supply voltage for additional circuitry.

The maximum current provided by each current mirror can be adjusted by the RSET resistor and the current of each LED (dot) can be dimmed in 255 steps by the internal register settings. The automatic slope function is also supported. Cycle and slope time can be separately adjusted for each LED (dot). Two patterns can be stored in the internal registers; four-way automatic scrolling is also possible.

• Luminance separately adjustable for each LED by internal registers in 255 steps

• Internal registers capable of storing two patterns

• 4-way scroll function with a possibility to lock column data

• 255-step PWM dimming

• SPI interface

• Integrated step-up converter with adjustable output voltage

• Integrated LDO with 3.1 V output at 80 mA