Datasheet

MAX6970
8-Port, 36V Constant-Current LED Driver
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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
HHR
1
R
2
…R
n-2
R
n-1
—
——————
— — —————
LLR
1
R
2
…R
n-2
R
n-1
—
——————
— — —————
XR
0
R
1
R
2
…R
n-1
R
n
—
——————
— — —————
——
XXX…XX 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
— — —————— —
XXX…XX
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.
Selector Guide
PART
NUMBER OF
OUTPUTS
MAX OUTPUT
VOLTAGE (V)
MAX OUTPUT
CURRENT
LED FAULT
DETECTION
WATCHDOG
MAX6968 ——
MAX6977 Yes —
MAX6978
8 5.5
Yes Yes
MAX6970 ——
MAX6981 Yes —
MAX6980
836
Yes Yes
MAX6969 ——
MAX6979
16 5.5
Yes Yes
MAX6971 ——
MAX6983
16 36
55mA
Yes Yes