A6285

The A6285 is designed for LED display applications. This BiCMOS device includes an On/Off shift register, a Dot Correction (DC) shift register, accompanying data latches, and 16 MOS constant-current sink drivers with active pull-ups that can be enabled or disabled as required by the application.

The CMOS shift registers and latches allow direct interfacing with microprocessor-based systems. With a 3.3 or 5 V logic supply, typical serial data input rates can reach up to 30 MHz. The LED drive current level can be set by a single external resistor, selected by the application designer. A CMOS serial data output permits cascading of multiple devices in applications requiring additional drive lines.

Individual LED light intensity can be adjusted to correct for light intensity variations by using the Dot Correction feature.

Open LED connections can be detected, and then signaled back to the host microprocessor through the serial data output (SDO pin). The FAULT output flags an LED open circuit (LOD) condition or a thermal shutdown (TSD) condition. A staggering delay on the load outputs during ON/OFF transitions helps to reduce ground bounce.

The device is available in a 32-lead QFN (package ET), with an exposed thermal pad. It is lead (Pb) free with 100% matte tin leadframe plating.