Rainbow-electronics MAX6971 Manual de usuario descargar pdf (Pagina 8)

MAX6971

16-Port, 36V Constant-Current LED Driver

8 _______________________________________________________________________________________

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

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

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.

OE is independent of the operation of the serial inter-

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

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

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_

CLK

OUT_

CLK

OUT_

CRR

CRF

LRR

LRF

Figure 3. LE and CLK to OUT_ Timing

Table 1. 4-Wire Serial-Interface Truth Table

SHIFT-REGISTER

CONTENTS

LATCH CONTENTS OUTPUT CONTENTS

SERIAL

DATA

INPUT

DIN

CLOCK

INPUT

CLK

…D

n-1

LOAD

INPUT

…D

n-1

BLANKING

INPUT

…D

n-1

…R

n-2

n-1

—

——————

—

— ————

—

…R

n-2

n-1

—

——————

—

—————

—

…R

n-1

—

——————

—

—————

—

——

XXX…XX

—R

n-1

—

—————

—

——

…P

n-1

…P

n-1

… P

n-1

——

——————

—

XXX…XX

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.

1 2 3 4 5 6 7 8 9 10 11 12

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Rainbow-electronics MAX6971 Manual de usuario Pagina 8

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