IC drives 24 LED channels at 80 mA
3 September 2008
Opto-Electronics
The STP24DP05 from STMicroelectronics provides 24 constant-current outputs capable of driving RGB LEDs at up to 80 mA, within a compact TQFP48, 7 x 7 mm footprint. Primary applications include full-colour RGB video display panels for indoor or outdoor use, LED advertisement billboards, graphic boards, coloured traffic signs, and variable message signs. The device is a serial-in, parallel-out FIFO supporting operation at 25 MHz for high serial data rates, enabling responsive image rendition. The driving current of 5 to 80 mA per LED channel is adjusted using one external resistor per colour group of eight outputs, allowing the maximum brightness of red, green and blue channels to be optimised independently. The STP24DP05 also implements built-in error detection for short-to-ground, short-to-supply or open-line faults. The error-detection mode can be controlled via the dedicated pin provided or using specific digital keys through the device’s SPI port.
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