16-Port, 36V Constant-Current LED Driver
MAX6971
CLK is the serial-clock input, which shifts data at DIN
into the MAX6971 16-bit shift register on its rising edge.
LE
t
LRF
OUT_
LE
t
LRR
OUT_
CLK
t
CRF
OUT_
CLK
t
CRR
OUT_
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鈥揙UT15 high impedance, without altering the
contents of the output latches, and low to enable out-
puts OUT0鈥揙UT15 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鈥檚 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.
Figure 3. LE and CLK to OUT_ Timing
Table 1. 4-Wire Serial-Interface Truth Table
SERIAL
CLOCK
DATA
INPUT
INPUT
CLK
D
0
DIN
H
L
X
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
H
L
R
0
X
P
1
鈥?/div>
SHIFT-REGISTER
CONTENTS
D
1
R
1
R
1
R
1
X
P
2
鈥?/div>
D
2
R
2
R
2
R
2
X
P
3
鈥?/div>
LOAD
INPUT
LE
鈥?D
n-1
D
n
鈥?R
n-2
R
n-1
鈥?R
n-2
R
n-1
鈥?R
n-1
R
n
鈥?/div>
鈥?/div>
X
鈥?/div>
X
鈥?/div>
鈥?P
n-1
P
n
鈥?/div>
鈥?/div>
鈥?/div>
H
L
鈥?/div>
LATCH CONTENTS
D
0
鈥?/div>
鈥?/div>
鈥?/div>
R
0
P
0
X
D
1
鈥?/div>
鈥?/div>
鈥?/div>
R
1
P
1
X
D
2
鈥?/div>
鈥?/div>
鈥?/div>
R
2
P
2
X
OUTPUT CONTENTS
BLANKING
INPUT
OE
鈥?D
n-1
D
n
D
0
D
1
D
2
鈥?D
n-1
D
n
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
L
H
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
P
0
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
P
1
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
P
2
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?R
n-1
R
n
鈥?P
n-1
P
n
鈥?/div>
X
X
鈥?/div>
P
n-1
P
n
Hi-Z Hi-Z Hi-Z 鈥?Hi-Z Hi-Z
L = Low-logic level.
H = High-logic level.
X = Don鈥檛 care.
P = Present state.
R = Previous state.
Hi-Z = High impedance.
8
_______________________________________________________________________________________
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