A6280EA-T Allegro Microsystems Inc, A6280EA-T Datasheet

A6280EA-T

Manufacturer Part Number

A6280EA-T

Description

IC,Laser Diode/LED Driver,DIP,16PIN,PLASTIC

Manufacturer

Allegro Microsystems Inc

Type

PWM Controlr

Datasheet

1.A6280EESTR-T.pdf (13 pages)

Specifications of A6280EA-T

Constant Current

Yes

Topology

Linear, PWM

Number Of Outputs

Internal Driver

Yes

Type - Secondary

RGB

Frequency

5MHz

Voltage - Supply

4.75 V ~ 17 V

Voltage - Output

1 V ~ 3 V

Mounting Type

Through Hole

Package / Case

16-DIP (0.300", 7.62mm)

Operating Temperature

-40°C ~ 85°C

Current - Output / Channel

150mA

Internal Switch(s)

Yes

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Efficiency

Lead Free Status / RoHS Status

Lead free / RoHS Compliant, Lead free / RoHS Compliant

Other names

620-1256

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Features and Benefits

▪ 3 × 10-bit PWM brightness settings

▪ 3 × 7-bit dot correction current settings

▪ 5 to 17 V operation

▪ Wide output current range, 10 to 150 mA per channel

▪ Serial port/PWM clock operates at up to 5 MHz

▪ Data and clock logic architecture allows single

▪ Buffered logic outputs to drive cables

▪ Thermal shutdown and UVLO protection

▪ Power-On Reset

Packages: 16 pin DIP (suffix A), and

16 pin QFN (suffix ES)

A6280-DS, Rev. 5

microcontroller control of large quantities of serially-

connected A6280s at fast data transfer rate

Power Supply Bus

Microprocessor

Output Enable

Latch Enable

Control Board

Clock

Data

Figure 1. Functional drawing of daisy chained display application. Additional pixel boards

with A6280 ICs can be applied.

ES, approximate scale 1:1

Cat5 UTP

Clock In

Data In

OE In

Latch In

3-Channel Constant-Current LED Driver

REG

LED

Pixel Board #1

Out

A6280

Application Diagram

Out

Clock Out

Latch Out

Data Out

OE Out

Out

EXT

with Programmable PWM Control

Cat5 UTP

Description

The A6280 is a 3-channel constant current LED driver that

has a wide range of output currents. The A6280 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.

The LED brightness is controlled by performing PWM control

on the outputs. The brightness data of the PWM signal for

each LED is stored in three 10-bit registers. The peak value

for each LED can be adjusted (dot-corrected) to compensate

for mismatch, aging, and temperature effects. All the internal

latched registers are loaded by a 31-bit shift register. One

address bit controls whether dot correction/clock divider ratio

or brightness data is loaded into the registers. The remaining

bits are used for the data. This helps reduce the pin count of

the A6280. To further lower the A6280 pin count, the PWM

clock and the serial bus clock share the same pin and work

concurrently to control LED brightness and to load data.

The A6280 is designed to minimize the number of components

needed to drive LEDs with large pixel spacing. A large number

of A6280s can be daisy chained together and controlled by

just four control signals (clock, serial data, latch, and output

enable). Each of these inputs has buffered outputs to drive

the next chip in the chain. Also, VIN can be tied to the LED

Continued on the next page…

Clock In

Data In

OE In

Latch In

REG

LED

Pixel Board #2

Out

A6280

Out

Clock Out

Latch Out

Data Out

OE Out

Out

EXT

Cat5 UTP

Pixel Board #N

A6280

Related parts for A6280EA-T

A6280EA-T Summary of contents

Page 1

Features and Benefits ▪ 3 × 10-bit PWM brightness settings ▪ 3 × 7-bit dot correction current settings ▪ operation ▪ Wide output current range 150 mA per channel ▪ Serial port/PWM clock operates ...

... Scrolling, colored marquees ▪ Architectural lighting ▪ High intensity monochrome displays ▪ Large video and graphic displays Selection Guide Part Number Packing* A6280EA-T 25 pieces/tube A6280EESTR-T 1500 pieces/reel *Contact Allegro for additional packing options. Absolute Maximum Ratings Characteristic Load Supply Voltage ...

Page 3

A6280 SDI CI LI OEI REXT R EXT VIN VREG OUT1 1 OUT0 2 SDO OEO REXT 7 VREG 8 Package A Terminal List Table Name A Package ES Package OUT1 1 OUT0 2 ...

Page 4

A6280 OPERATING CHARACTERISTICS, valid at T Characteristic ELECTRICAL CHARACTERISTICS Quiescent Supply Current Operating Supply Current Load Supply Voltage Undervoltage Lockout VREG Voltage Range 1 Output Current (any single output) Output to Output Matching Error 2 Output Voltage Range Load Regulation ...

Page 5

A6280 0 CI (Clock In SDI D30 D29 (Serial Data In) SDO (Serial Data Out) LI (Latch In) LO (Latch Out (Clock In PWM Counter 0 ...

Page 6

A6280 Shift Register The A6280 has a 31 bit shift register that loads data through the SDI (Serial Data In) pin. The shift register operates by a first-in first-out (FIFO) method. The most significant bit (MSB, bit 30) is the ...

Page 7

A6280 PWM Brightness Control The A6280 controls the intensity of each LED by pulse width modulating the current of each output. The A6280 has three 10-bit brightness registers, one for each output. These brightness registers set the PWM count value ...

Page 8

A6280 and external voltage regulators. For 5 V supplies, connect VIN to VREG externally. Note: When using 5 V supplies, ensure that VIN does not exceed the absolute maximum rating of the VREG pin (6 V). The V REG pin ...

Page 9

A6280 Undervoltage Lockout The A6280 includes an internal undervoltage lockout (UVLO) circuit that disables the driver outputs in the event of the logic supply voltage dropping below a minimum acceptable level. This prevents the display of erroneous information, a necessary ...

Page 10

A6280 Timing Considerations A6280s can be used in large numbers to drive many LEDs with the control signals connected serially together, with short cables between each pixel (see figure 8). Because the clock negative edge drives the data to the ...

Page 11

A6280 8 μF – System Logic Clock Data Latch Output Enable Tie LGND and PGND to PAD externally + μF – System Logic Clock Data Latch Output Enable Tie LGND and PGND to PAD ...

Page 12

A6280 A 0.005 D 17X 0.08 C 0.25 0.40 3-Channel Constant-Current LED Driver with A Package, 16 Pin DIP 0.750 16 0.250 1 2 All dimensions nominal, not for tooling use 0.210 (reference JEDEC MS-001 BB) Dimensions in inches 0.130 ...

Page 13

A6280 Copyright ©2006-2007, Allegro MicroSystems, Inc. The products described here are manufactured under one or more U.S. patents or U.S. patents pending. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such de par tures from the ...

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