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SILICON TOUCH TECHNOLOGY INC.

8-bit Constant Current LED Driver with Error Detection

Version:A.001

Page 3

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DM117

Pin Connection

Pin Description

PIN No.

PIN NAME

FUNCTION

1

VCC

Supply voltage terminal.

2

EN

Output enable terminal:

‘H’ for all outputs are turned off ,

‘L’ for all outputs are active.

3

LAT

Input terminal of data strobe. Data on shift register goes through at the rising

edge of LAT (edge trigger). Otherwise, data is latched.

4

CLK

Synchronous clock input terminal for serial data transfer. Data is sampled at the

rising edge of DCK.

5

DAI

Serial data input terminal.

6

OS

Input open/short detection selection:

‘H’ for LED short detection mode

‘L’ for LED open detection mode.

‘Edge’

7~14

OUT0~7

Sink constant-current outputs (open-drain)

15

DAO

Serial data output terminal.

16

ALARM

Output open drain terminal: (connected to a pull-high resistor)

17

SDO

Serial data output trigger mode selection:

‘H’ means data is shifted out on synchronization to falling edge of CKO

‘L’ means data is shifted out on synchronization to rising edge of CKO

18

REXT

External resistors connected between REXT and GND for output current value

setting.

19

RESERVED

Terminal for testing, user should leave this pin open.

20

GND

Ground terminal