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Related Links:

Datasheets:
A6285: 16-Channel Constant-Current Latched LED Driver (PDF)

Selection Guides:
LED Display Drivers

when this product is updated

Press Releases:
A6282 and A6285: Allegro MicroSystems, Inc. Introduces Two 16-Channel LED Driver ICs for Display Applications

A6285
16-Channel Constant-Current Latched LED Driver with Open LED Detection and Dot Correction

Features

• 3.0 to 5.5 V logic supply range
• Schmitt trigger inputs for improved noise immunity
• Power-On Reset (POR)
• Up to 80 mA constant-current sinking outputs
• LED open circuit detection (LOD)
• Dot correction (DC) for adjusting LED light intensity on each channel with 7-bit resolution
• Low-power CMOS logic and latches
• High data input rate up to 30 MHz
• Active output pull-ups with enable/disable
• 20 ns typical staggering delay between outputs
• Internal UVLO and thermal shutdown (TSD) circuitry
• Fault output flags for an LED open circuit (LOD) or a thermal shutdown (TSD) condition

Applications

• Display backlighting
• Monocolor, multicolor, or full-color LED display
• Monocolor, multicolor, LED Signboard
• Multicolor LED lighting

Description

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.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A6285EET-T	32-lead QFN	Yes	view data	-40 °C to  85 °C	new	Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor.
A6285EETTR-T	32-lead QFN	Yes	view data	-40 °C to  85 °C	new	Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor.

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.