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MAX6970 Datasheet(PDF) 8 Page - Maxim Integrated Products

Part # MAX6970
Description  16-Port, 36V Constant-Current LED Driver
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX6970 Datasheet(HTML) 8 Page - Maxim Integrated Products

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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_
tCRR
tCRF
tLRR
tLRF
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
D0
D1
D2
…Dn-1 Dn
LOAD
INPUT
LE
D0
D1
D2
…Dn-1 Dn
BLANKING
INPUT
OE
D0
D1
D2
…Dn-1 Dn
H
HR1
R2
…Rn-2 Rn-1
——
——
————
L
LR1
R2
…Rn-2 Rn-1
——
——
——
X
R0
R1
R2
…Rn-1 Rn
——
——
——
——
XX
X
XX
H
R0
R1
R2
—Rn-1 Rn
——
——
P1
P2
P3
…Pn-1 Pn
L
P0
P1
P2
…Pn-1 Pn
L
P0
P1
P2
… Pn-1 Pn
——
——
——
——
XX
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.


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