DM141 datasheet(10/16 Pages) ETC2

10 / 16 page

DM141

點晶科技股份有限公司

SILICON TOUCH TECHNOLOGY INC.

8x2-Bit Constant Current LED Drivers

-9-

Version

：

：A.012

Serial_In Data, Serial_Out and Latch

The SIN data will be clocked into the 16 bits shift register synchronized on the rising edge of

CLK. And the data ‘1’ represents the corresponding current output ‘ON’, while the data ‘0’

stands for ‘OFF’. The data will be transferred into the latch as the LTH pin goes high. And the

data will be latched when LTH goes low.The SERIAL_OUT data is shifted out on

synchronization to the falling edge of CLOCK. The graph below depicts the timing of data

serial-in and serial-out.

Package and Thermal Pad

The IC’s thermal pad (QFN) which is internally connected to the bottom side of chip should be

connected to GND. And, good PCB layout pattern conducted to thermal pad will have better

performance in thermal effect. Due to the small size and low profile, the majority of heat

generated by the die within this package is dissipated through the thermal pad to PCB. The PCB

configuration and metal layers embedded in the PCB become important to achieving good

thermal performance. By increasing the embedded copper area, the thermal performance will be

improved. Thermal vias which conduct heat from the surface of the PCB to the ground plane are

necessary. More vias may improve the package thermal performance.

CLK

SIN

LTH

OFF

SOUT

Previous Data

16 Clocks

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