Constant-current, 8-bit LED driver with diagnostics

18 October 2006 Power Electronics / Power Management

austriamicrosystems has unveiled an innovative 8 channel constant current LED driver with diagnostics function. The AS1109 LED driver has advanced error diagnostics for open and shorted LED. A fast 30 MHz serial interface ensures high refreshing rates for even large LED display modules. It uses the serial data input/output lines for the error information readback so that no additional PCB tracks are needed for diagnostics. The device features eight regulated current ports which provide constant currents for driving LEDs within a wide range of forward voltage variations. Output accuracy is ±2% between channels and ICs. Through an external resistor, the currents can be adjusted from 0,5 to 100 mA, which giving flexibility in controlling LED brightness. The built-in LED error detection can be invoked during normal operation without switching into a separate detection mode. The AS1109 can detect any open- or short-circuit as well as an over-temperature occurrence. In order to avoid the typical flickering of LED displays during error detection, austriamicrosystems developed a unique low-current diagnostic mode, which uses only 0,6 mA for a very short time. A detailed error report can be read out with the exact position of the broken LED.

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