點晶科技股份有限公司

SILICON TOUCH TECHNOLOGY INC

.

新竹市科學園區展業一路9號7樓之1

9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C.

Tel：886-3-5645656

Fax：886-3-5645626

16-channel 16-bit PWM Constant Current LED Driver

Version:PRE.001

Preliminary

Page 4

未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任

Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.

DM632B

Equivalent Circuit of Inputs and Outputs

1. DCK, DAI,

LAT , GCK terminals

2. DAO terminals

PCB Layout Consideration

To connect an external resistor to REXT pin and ground can determine the maximum output

current. If there is any disturbance occurred to REXT pin, the constant current output may be

unstable or has noise happened. Since REXT (pin23), DAO (pin22), and GCK (pin21) are next to

each other, the most possible interference is caused by DAO or GCK signal. Accordingly, it is

recommended that adding some shielding area within the above pins in PCB layout, or laying the

signal line of above pins on different PCB layer will prevent the noise problems effectively.