DM141
點晶科技股份有限公司
點晶科技股份有限公司
點晶科技股份有限公司
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
EN
G1
R1
G2
R2
R7
G8
R8
5V
0V
5V
0V
5V
0V
5V
0V
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
5V
0V
SOUT
Previous Data
16 Clocks