12-Channels Pre-programmable Constant Current LED Driver

Version:A.007

Page 3

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DM621

Pin Description

PIN NAME

FUNCTION

PIN No.

VDD

Power supply terminal

QFN20:1 ,TSSOP24:23

DCK

Synchronous clock input for serial data.

The input data of SIN is transferred at rising

edges of DCK. It also could be used as GCK.

QFN20:11 ,TSSOP24:11

DCKO

Synchronous clock output

QFN20:12 ,TSSOP24:12

VSS_DR

Driver ground terminal

QFN20: Thermal Pad

TSSOP24:10,15,22,24

SIN

Serial input for grayscale data

QFN20:13 ,TSSOP24:13

SOUT

Serial output for grayscale data

QFN20:14 ,TSSOP24:14

REXT_R

QFN20:2 ,TSSOP24:1

REXT_G

QFN20:3 ,TSSOP24:2

REXT_B

External resistor connected between REXT

and GND for driver current setting.

QFN20:4 ,TSSOP24:3

IOUT_R [3:0]

QFN20:5,8,15,18

TSSOP24:4,7,16,19

IOUT_G [3:0]

QFN20:6,9,16,19

TSSOP24:5,8,17,20

IOUT_B [3:0]

LED driver outputs

QFN20:7,10,17,20

TSSOP24:6,9,18,21

Pin Configuration (Top View)

Figure 2. The Package of QFN20

Figure 3. The Package of TSSOP24