A6278ELPTR-T datasheet(5/18 Pages) ALLEGRO

Part #	A6278ELPTR-T

Description	Serial-Input Constant-Current Latched LED Drivers with Open LED Detection

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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Serial-Input, Constant-Current Latched

LED Drivers with Open LED Detection

A6278 and

A6279

5

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

Serial

Data

Input

Clock

Input

Shift Register Contents

Serial

Data

Out

Latch

Enable

Input

Latch Contents

Output

Enable

Input

Output Contents

I0 I1 I2 … In-1 In

H

H R0 R1 … Rn-2 Rn-1

R

n

-1

L

L R0 R1 … Rn-2 Rn-1

R

n

-1

X

R0 R1 R2 … Rn-1 Rn

R

n

X X X … X

X

L

R0 R1 R2 … Rn-1 Rn

P0 P1 P2 … Pn-1 Pn

P

n

HP0 P1 P2 … Pn-1 Pn

LP0 P1 P2 … Pn-1 Pn

X X X … X

X

H

H H H … H

H

L = Low logic (voltage) level

H = High logic (voltage) level

X = Don’t care

P = Present state

R = Previous state

n = 7 for the A6278, n = 15 for the A6279

Truth Table

Inputs and Outputs Equivalent Circuits

VDD

IN

VDD

LE

VDD

OUT

VDD

IN

VDD

IN

OUTPUT ENABLE

(active low)

CLOCK and

SERIAL DATA IN

LATCH ENABLE

SERIAL DATA OUT

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