SAMHOP Microelectronics Corp.
8-BIT CONSTANT CURRENT LED DRIVER
BLOCK DIAGRAM
OUT0
R-EXT
I-REG.
OUT1
OUT7
ENABLE
Q
ST D
Q
ST D
Q
ST D
LATCH
SERIAL-IN
CLOCK
D Q
CK
D Q
CK
D Q
CK
D Q
CK
SERIAL-
OUT
TIMING DIAGRAM
CLOCK
SERIAL-IN
LATCH
ENABLE
OUT0
OUT1
OUT2
OUT7
SERIAL-OUT
.....
5V
0V
5V
0V
5V
0V
5V
0V
On
Off
On
Off
On
Off
On
Off
5V
0V
Note : Latches are level sensitive, not rising edges sensitive and not synchronous CLOCK.
Input of LATCH-terminal to H Level, data passes latches, and input of LATCH -terminal to L level, data
hold latches.
Input of ENABLE-terminal to H Level, all output (OUT0 ~ 7) do off.
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