Maker : Allegro MicroSystems
Part No. : A6285

  Datasheet PDF : A6285.pdf
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Shortcut : A6280  A6281  A6282  A6283  A6285 

Product Information

A6285 16-Channel Constant-Current Latched LED Driver with Open LED Detection and Dot Correction Features and Benefits 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 www.DataSheet4U.com ▪ 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 ▪ ▪ ▪ ▪ ▪ ▪ 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. Package: 32 Contact QFN (suffix ET) 5 mm × 5 mm 0.90 mm nominal overall height Continued on the next page… Not to scale Typical Application VDD VLED VLED 10 μF PE OUT0 OUT15 100 KΩ SDI FAULT Controller CLK LE MODE OE SDI FAULT CLK LE MODE OE SDO VDD A6285 100 nF REXT SDO 6285-DS A6285 16-Channel Constant-Current Latched LED Driver with Open LED Detection and Dot Correction Description (continued) 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. Applications include the following: ▪ Display backlighting ▪ Monocolor, multicolor, or full-color LED display ▪ Monocolor, multicolor, LED Signboard ▪ Multicolor LED lighting www.DataSheet4U.com Selection Guide Part Number A6285EET-T A6285EETTR-T Package 5×5 mm QFN, 32 pin, exposed thermal pad 5×5 mm QFN, 32 pin, exposed thermal pad Packing (estimated) 73 pieces per tube 1500 pieces per 7-in reel 7000 pieces per 13-in. reel Absolute Maximum Ratings Characteristic Supply Voltage* OUTx Current (any single output) Input Voltage Range* LED Load Supply Range* ESD Rating Operating Temperature Range (E) Junction Temperature Storage Temperature Range *With respect to ground (GND, PGND). TA TJ(max) Tstg Symbol VDD IO VI VLED HBM (JEDEC JESD22-A114, Human Body Model) CDM (JEDEC JESD22-C101, Charged Device Model) VOE, VLE, VCLK, VSDI, VMODE Notes Min. –0.3 – –0.3 –0.3 – – –40 – –55 Max. 5.5 90 VDD + 0.3 13.2 1.5 1.0 85 150 150 Unit V mA V V kV kV °C °C °C Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 A6285 16-Channel Constant-Current Latched LED Driver with Open LED Detection and Dot Correction Functional Block Diagram 0 1 Status Info: LOD 0 15 VDD 1 15 TSD FAULT MODE 1 MODE 0 LOD LE CLK SDI MODE 0 UVLO POR VDD 1 0 MODE www.DataSheet4U.com ON/OFF Shift Register 0 15 0 DC Shift Register 111 1 0 MODE SDO LE 1 0 MODE TSD ON/OFF Register 0 DC Register 0 6 ON/OFF Reg...

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