DM133

點晶科技股份有限公司

SILICON TOUCH TECHNOLOGY INC.

16-Bit Constant Current LED Drivers

-3-

Version

：A.024

Block Diagram

Pin Description

SDIP No.

PIN NAME

FUNCTION

1

Supply voltage terminal.

2

ENABLE

Input terminal of output enable (active low), all outputs are off when ENABLE

is high.

3

LATCH

Input terminal of data strobe. Data is latched when LATCH is low. And data on

shift register goes through when LATCH is high.

4

CLOCK

Input terminal of a clock for shift register. Data is sampled at the rising edge of

CLOCK.

5

SERIAL_IN

Input terminal of a data shift register.

6

DATASEL

Input terminal of a data path selection for output current on/off or global

current adjustment

7~22

OUT0~15

Output terminals with constant current.

23

SERIAL-OUT Output terminal of a data shift register.

24

ALARM

Output open drain terminal for an alarm function. It will go low as LED

open/short or chip overheated.

25

SOMODE

Input terminal of a data output trigger mode selection

26

REXT

Input terminal of an external resistor. The current flows through the resistor

from REXT to ground will be the reference base current of output sink current.

27

RESERVED

Terminal for testing, user should leave this pin open.

28

GND

Ground terminal

SERIAL_IN

6 bits Shift

Register

10 bits Shift Register

Serial_out

Selector

16 bits Latch

6 bits Latch

16 bits Constant

Current Driver

Global Current

Controller

Voltage

Reference

LED Open Detection

Thermal

Alarm

CLOCK

LATCH

SOMODE

SERIAL_OUT

REXT

OUT0

OUT15

ALARM

DATASEL

Channel

Selector

ENABLE

6bit data

Channel

Selector