TRUTH TABLE

EQUIVALENT CIRCUIT OF INPUTS AND OUTPUTS

Page 4

D

n

… D

No change

D

n

D

n + 1

D

n - 8

D

n - 7

UP

UP

H

L

L

L

D

… D

n - 5

D

n + 2

D

n - 6

UP

H

L

D

… D

n - 5

D

n + 3

D

n - 5

DOWN

X

L

Off

D

n + 3

D

n - 5

DOWN

X

H

ENABLE

GND

LATCH

GND

1. ENABLE terminal

2. LATCH terminal

3. CLOCK, SERIAL-IN terminal

4. SERIAL-OUT terminal

SAMHOP Microelectronics Corp.

8-BIT CONSTANT CURRENT LED DRIVER

V.2.10

Note : 1.OUT0~7=on when Dn="H" ; OUT0~7=off when Dn="L".

2. In order to ensure that the level of the power supply voltage is correct, an external resistor

must be connected betwen R-EXT and GND.

CLOCK,

SERIAL-IN

GND

GND

SERIAL-OUT

OUT0 … OUT5 … OUT7

SERIAL-IN

SERIAL-OUT

CLOCK

LATCH

ENABLE