ImplementingLEDDriversinAlteraMAXSeries.pdfVIP

2014.09.22 AN-286 Implementing LED Drivers in Altera MAX Series Subscribe Send Feedback Altera? MAX? II, MAX V, MAX 10, MAX 3000A, MAX 7000A, MAX 7000B, and MAX 7000S devices can be used in this example application. Discrete LED driver chips are common on many system boards. Supported Altera devices offer unique capabilities that allow you to integrate single or multiple LED driver chips into a single device. Related Information ? Design Example for MAX II Provides the MAX II design files for this application note (AN 286). ? Design Example for MAX 10 Provides the MAX 10 design files for this application note (AN 286). Commercial LED Driver Chips Many LEDs, such as the seven-segment display, are common-anode LEDs. The LEDs anode connects to VsinCkCsatnhde each cathode connects to an output pin of the DC current required to drive the display, and current-sinking LED driver chip. The driver chip the LED turns on when the driver chips output pins drive low. Current-regulating circuits are implemented inside the LED driver chips. Current-sinking LED drivers are more common than current-sourcing drivers. Table 1: Current-Sinking LED Driver Chips Lists some common LED driver chips manufactured by Texas Instruments, National Semiconductor, and Toshiba. The manufacturer datasheets provide additional information about LED driver chips. LED Driver Chip Description Texas Instruments TLC5905 TLC5910 TLC5911 TLC5921 LED driver with shift registers, data latch, and constant current circuitry LED driver with shift registers, data latch, on-chip phase-locked loop (PLL) for gray scale generation and constant current LED driver with shift registers, data latch, on-chip PLL for gray scale generation and constant current LED driver with shift register, data latch, and current-sink constant current circuitry National Semiconductor DS8874 9-digit shift input LED driver ? 2014 Altera Corporation. All rights reserved. ALTERA, ARRIA, CYCLONE, ENPIRION, MAX, MEGACORE, NIOS, QUARTUS and STRAT