T-Core
User Manual
19
January 14, 2020
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Control Method
For the WS281B RGB LED, each R/G/B color can be independently controlled, and each color can
be adjusted from level 0 to 255. Therefore, each color needs to use 8bit control, and each LED
needs 24bit control. The 24 bits corresponds to the
Figure 2-19 Composition of 24bit data
The logic 1 or 0 of each bit is determined as shown in
. It is determined by the length of
the voltage level in a period. Detailed specifications can refer to
Figure 2-20 Sequence Chart
Table 2-7 Code Timing
Code Status
Description
Timing
T0H
0 code, high voltage time
220ns~380ns
T1H
1 code, high voltage time
580ns~1µs
T0L
0 code, low voltage time
580ns~1µs
T1L
1 code, low voltage time
220ns~420ns
RES
Frame unit, low voltage time
>280µs
The data transfer protocol of the WS281 use single NRZ communication mode. As shown in
, after the pixel power-on reset, the DI port receive data from controller, the first pixel collect
initial 24bit data then sent to the internal data latch, the other data which reshaping by the internal
signal reshaping amplification circuit sent to the next cascade pixel through the DO port. After
transmission for each pixel, the signal to reduce 24bit. Pixel adopt auto reshaping transmit
technology, making the pixel cascade number is not limited the signal transmission, only depends
on the speed of signal transmission.