DM115B

點晶科技股份有限公司

SILICON TOUCH TECHNOLOGY INC.

8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage

Version:A.001

Page 3

Timing Diagram

(Note) Latches are level sensitive (not edge triggered).

LATCH-terminal = H level, latches become transparent; LATCH-terminal = L level, latches hold data.

ENABLE-terminal = H level, all outputs (OUT0~7) are off.

An external resistor is connected between R-EXT and GND for setting up the value of constant current.

SERIAL-OUT changes state on the rising edges of clock.

Pin Description

PIN No.

PIN NAME

FUNCTION

1

GND

GND terminal

2

SERIAL-IN

Input terminal of a data shift register

3

CLOCK

Input terminal of a clock for shift register

4

LATCH

Input terminal for data strobe

5~12

OUT0~7

Output terminals

13

ENABLE

Input terminal for output enable (active low)

14

SERIAL-OUT

Output terminal of a data shift register

15

R-EXT

Input terminal of an external resistor

16

3.3/5V Supply voltage terminal

OUT7

SERIAL-OUT

OUT2

OUT1

OUT0

LATCH

0V

3.3/5V

0V

3.3/5V

SERIAL IN

CLOCK

0V

3.3/5V

Off

0V

Off

On

Off

On

Off

0V

3.3/5V

3.3/5V

ENABLE