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16-bit Constant Current LED Driver with Error Detection

Version:A.001

Page 4

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DM137

Pin Description

PIN No.

PIN NAME

FUNCTION

SSOP28/HSOP28: 1

QFN32: 5

VCC

Supply voltage terminal.

SSOP28/HSOP28: 2

QFN32: 6

EN

Output enable terminal:

‘H’ for all outputs are turned off ,

‘L’ for all outputs are active.

SSOP28/HSOP28: 3

QFN32: 9

LAT

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

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

SSOP28/HSOP28: 4

QFN32: 10

CLK

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

rising edge of CLK.

SSOP28/HSOP28: 5

QFN32: 11

DAI

Serial data input terminal.

SSOP28/HSOP28: 6

QFN32: 12

OS

Input open/short detection selection:

‘H’ for LED short detection mode,

‘L’ for LED open detection mode,

‘Edge’

SSOP28/HSOP28:

7~22

QFN32: 13~28

OUT0~15

Sink constant-current outputs (open-drain).

SSOP28/HSOP28: 23

QFN32: 29

DAO

Serial data output terminal.

SSOP28/HSOP28: 24

QFN32: 30

ALARM

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

‘H’ for normal conditions,

‘L’ for LED open/short or chip overheated.

SSOP28/HSOP28: 25

QFN32: 31

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.

SSOP28/HSOP28: 26

QFN32: 32

REXT

External resistors connected between REXT and GND for output current value

setting.

SSOP28/HSOP28: 27

QFN32: 3

RESERVED Terminal for testing, user should leave this pin open.

SSOP28/HSOP28: 28

Thermal pad

QFN32: 1, 2, 4, 7, 8

Thermal pad

GND

Ground terminal.