MAX6971AUG+T【PDF 8/12 页】IC LED DRIVER LINEAR 24-TSSOP

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16-Port, 36V Constant-Current LED Driver

CLK is the serial-clock input, which shifts data at DIN

into the MAX6971 16-bit shift register on its rising edge.

LE

OUT_

LE

OUT_

t LRF

t LRR

LE is the latch load input of the MAX6971 that transfers

data from the MAX6971 16-bit shift register to its 16-bit

latch when LE is high (transparent latch), and latches

the data on the falling edge of LE (Figure 2).

The fourth input provides output-enable control of the

output drivers. OE is high to force outputs

OUT0 –OUT15 high impedance, without altering the

contents of the output latches, and low to enable out-

puts OUT0 –OUT15 to follow the state of the output

latches.

CLK

OUT_

t CRF

OE is independent of the operation of the serial inter-

face. Data can be shifted into the serial-interface shift

register and latched, regardless of the state of OE .

DOUT is the serial-data output, which shifts data out

CLK

t CRR

from the MAX6971’s 16-bit shift register on the rising

edge of CLK. Data at DIN is propagated through the

shift register and appears at DOUT 16 clock cycles later.

OUT_

Figure 3. LE and CLK to OUT_ Timing

Table 1. 4-Wire Serial-Interface Truth Table

SERIAL

DATA

INPUT

DIN

CLOCK

INPUT

CLK

D 0

SHIFT-REGISTER

CONTENTS

D 1 D 2 … D n-1 D n

LOAD

INPUT

LE

D 0

LATCH CONTENTS

D 1 D 2 … D n-1 D n

BLANKING

INPUT

OE

D 0

OUTPUT CONTENTS

D 1 D 2 … D n-1 D n

H

L

X

H

L

R 0

R 1

R 1

R 1

R 2

R 2

R 2

… R n-2 R n-1

… R n-2 R n-1

… R n-1 R n

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

X

X

X

…

X

X

H

R 0

R 1

R 2

— R n-1 R n

—

—

—

—

—

—

—

—

—

P 1

P 2

P 3

… P n-1 P n

L

P 0

P 1

P 2

… P n-1 P n

L

P 0

P 1

P 2

… P n - 1 P n

—

—

—

—

—

— — —

—

X

X

X

…

X

X

H

Hi-Z Hi-Z Hi-Z … Hi-Z Hi-Z

L = Low-logic level.

H = High-logic level.

X = Don’t care.

P = Present state.

R = Previous state.

Hi-Z = High impedance.

8

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