A6278 데이터 시트보기 (PDF) - Allegro MicroSystems
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A6278 Datasheet PDF : 18 Pages
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A6278 and
A6279
Serial-Input, Constant-Current Latched
LED Drivers with Open LED Detection
Serial
Data
Input
H
L
X
Clock
Input
Shift Register Contents
I0 I1 I2 … In-1 In
H R0 R1 … Rn-2 Rn-1
L R0 R1 … Rn-2 Rn-1
R0 R1 R2 … Rn-1 Rn
X XX … X X
P0 P1 P2 … Pn-1 Pn
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
Serial
Data
Out
Rn-1
Rn-1
Rn
X
Pn
Latch
Enable
Input
Latch Contents
I0 I1 I2 … In-1 In
L
R0 R1 R2 … Rn-1 Rn
H
P0 P1 P2 … Pn-1 Pn
X XX … X X
Output
Enable
Input
Output Contents
I0 I1 I2 … In-1 In
L
P0 P1 P2 … Pn-1 Pn
H
H HH … H H
Inputs and Outputs Equivalent Circuits
VDD
VDD
VDD
VDD
IN
IN
ILNE
OUT
OUTPUT ENABLE
(active low)
CLOCK and
SERIAL DATA IN
LATCH ENABLE
SERIAL DATA OUT
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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