A6281EESTR

The A6281EESTR is one member of the A6281 series.The A6281 is a 3-channel constant current LED driver that has a wide range of output currents. The A6281 controls LED brightness with a Pulse Width Modulation (PWM) scheme that gives the application the capability of displaying a billion colors in an RGB cluster. The maximum current is set by an external resistor.

Features of the A6281EESTR are:(1)3*10-bit PWM brightness settings; (2)3*7-bit dot correction current settings; (3)5 to 17 V operation; (4)wide output current range, 10 to 150 mA per channel; (5)internally generated PWM clock; (6)serial port operates at up to 5 mhz ; (7)data and clock logic architecture allows single microcontroller control of large quantities of serially-connected a6281s at fast data transfer rate; (8)buffered logic outputs to drive cables; (9)thermal shutdown and UVLO protection; (10)power-on reset.The A6281 has a built-in linear regulator. The regulator operates from a supply voltage of 5.5 to 17 V. It allows the VIN pin of the A6281 to connect to the same supply as the LEDs. This simplifies board design by eliminating the need for a chip supply bus and external voltage regulators.

The absolute maximum ratings of the A6281EESTR can be summarized as:(1)load supply voltage:17 V;(2)output voltage:0.5V to 17V;(3)output current:170 mA;(4)storage temperature:55 to +150;(5)operating ambient temperature:40 to +85;(6)maximum junction temperature:150.The A6281 controls the intensity of each LED by pulse width modulating the current of each output. The A6281 has three 10-bit brightness registers, one for each output. These brightness registers set the PWM count value at which the outputs switch off during each PWM cycle. Each 10-bit brightness register gives 1023 levels of light intensity.The A6281 is designed to allow daisy chaining many A6281s together. It can pass the clock, data, latch, and output enable signals from one A6821 to the next without any loss of data due to duty cycle skewing or signal degradation.