16-Channel Constant-Current LED Driver

A6282

8

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

Operating Characteristics

0

50

45

40

35

30

25

20

15

10

5

0

60

50

40

30

20

10

0

0.3 0.6 0.9 1.2

1.5 1.8 2.1 2.4 2.7

3.0

0.3

1.0

2.0

3.0 4.0 5.0

4.5 to 5.0

3.0 to 3.6

Channel Maximum Constant Output Current

versus External Reference Resistance

Input-Output Truth Table

Serial

Data

Input

(SDI)

Clock

Input

(CLK)

Shift Register Contents

Serial

Data

Out

(SDO)

Latch

Enable

Input

(LE)

Latch Contents

Output

Enable

Input

(¯

O

¯¯

¯

E

¯)

Output Contents

…

…

…

H

L

X

X X X … X

X

L

H

L

(Outputs on)

X X X …

X

H

(Outputs off)

H H H … H

L = Low logic (voltage) level, H = High logic (voltage) level, X = Don’t care, P = Present state, R = Previous state

Channel Output Current versus Output Voltage