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參數(shù)資料
| 型號(hào)： | MAX6979 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | AND-OR-invert Gates 14-CDIP -55 to 125 |
| 中文描述： | 16端口、5.5V恒流LED驅(qū)動(dòng)器，帶有LED故障檢測(cè)和看門狗 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 304K |
| 代理商： | MAX6979 |
M
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
register and latched, regardless of the state of
OE
.
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.
LE
OUT_
LE
OUT_
CLK
OUT_
CLK
OUT_
t
CRR
t
CRF
t
LRR
t
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
0
D
1
D
2
… D
n-1
D
n
LOAD
INPUT
LE
D
0
D
1
D
2
… D
n-1
D
n
BLANKING
INPUT
OE
D
0
D
1
D
2
… D
n-1
D
n
H
L
X
—
H
L
R
0
X
P
1
—
R
1
R
1
R
1
X
P
2
—
R
2
R
2
R
2
X
P
3
—
… R
n-2
R
n-1
… R
n-2
R
n-1
… R
n-1
…
X
… P
n-1
—
—
—
—
—
H
L
—
—
—
—
R
0
P
0
X
—
—
—
R
1
P
1
X
—
—
—
R
2
P
2
X
—
—
—
—
…
…
—
—
—
R
n-1
R
n
P
n-1
P
n
X
—
—
—
—
—
—
—
L
H
—
—
—
—
P
0
Hi-Z Hi-Z Hi-Z … Hi-Z Hi-Z
—
—
—
—
P
1
—
—
—
—
P
2
—
—
—
—
…
P
n
-
1
—
—
—
—
—
—
—
—
P
n
R
n
X
P
n
—
—
—
—
—
—
X
L = Low-logic level.
H = High-logic level.
X = Don’t care.
P = Present state.
R = Previous state.
Hi-Z = High impedance.
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