16-channel LED driver IC with serial input/output interfacing

4th April 2008

ES Admin

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The A6282 from Allegro MicroSystems Europe is a 16-channel LED driver IC with serial data inputs and outputs which allow easy cascading in large-scale display applications. The new device includes an input shift register, data latches, and 16 constant-current sink drivers delivering up to 50 mA per channel at 12 V. The CMOS shift registers and latches allow direct interfacing with microprocessor-based systems with supply voltages of 3.3 to 5 V.

The 50 mA per channel current rating makes the A6282 suited to both multiplexed and non-multiplexed applications, while the 12 V maximum LED voltage allows it to drive either one LED or series strings of two or three LEDs on each channel. The maximum LED drive current can be set by a single external resistor, and the brightness of all the channels can be controlled by applying a pulse-width-modulated (PWM) signal to the 'output enable' input.

Serial data input rates can reach up to 30 MHz, and a serial data output permits cascading of multiple devices in applications requiring more than 16 LEDs such as megapixel text or video displays for signs and control panels. The device can also be used in smaller applications such as LCD backlighting or controlling LEDs in an instrument or control panel.

The device incorporates thermal shutdown and undervoltage lockout protection and power-on reset. It operates over a temperature range of -40C to +85C, making it suitable for use in outdoor applications.

The A6282 is available in a variety of 24-terminal package types including HTSSOP with exposed thermal pad, the QFN with exposed thermal pad, measuring 4 x 4 mm with 0.5 mm pitch, and the 0.3-inch wide SOIC package.