16-Channel LED Driver Integrates Diagnostics

The 16-channel, constant-current AS1109 LED driver integrates what are said to be easy-to-use error diagnostic modes for detecting open and shorted LEDs. The device employs the serial data input/output lines for error information read back, eliminating the need for PCB tracks for diagnostics. Its 16 regulated ports provide constant current within a wide range of forward voltage variations, and the output ports can endure a maximum voltage of 15V. Via an external resistor, current levels are adjustable from 0.5 mA to 100 mA. Accuracy is ±3% between channels. The driver can be used in multiplexed mode to drive up to 64 independent LED nodes while maintaining full functionality of the error detection modes. Other features include a 30-MHz serial interface and an operating temperature range from -40°C to +85°C. The AS1110 is available in a 24-pin SSOP-150 and a 28-pin QFN package. For pricing, call AUSTRIAMICROSYSTEMS USA INC., Raleigh, NC. (919) 676-5292.