⚫ Built-in signal shaping circuit, after any IC receives the signal, the waveforms of other various LED
lighting products are shaped and re-output to ensure that the waveform distortion of the line will not
be accumulated.
⚫ Built-in power-on reset and power-down reset circuit
⚫ The PWM control terminal can achieve 256 levels of adjustment, and the scanning frequency is not
less than 400Hz/s.
⚫ Serial interface level connection port, which can receive and decode data through one signal line
⚫ Any two points transmission distance is more than 10 meters without adding any circuit
⚫ When the refresh rate is 30 frames/second, the cascading number of the low-speed mode is not less
than 512 points, and the high-speed mode is not less than 1024 points.
⚫ Data transmission speed is 800Kbps mode
Working principle of WS2812 RGB LED Light
WS2812 RGB LED light data protocol adopts single-line return-to-zero code communication mode.
After the power-on reset, the DIN terminal accepts the data transmitted from the controller. The first 24 bits
of data sent by the first pixel are extracted and sent. The data latch inside the pixel, the remaining data is
shaped and amplified by the internal shaping processing circuit, and then the output is forwarded to the next
cascaded pixel through the DO port, and the signal is reduced by 24 bits after each pixel transmission. The
pixel adopts automatic shaping and forwarding technology, so that the number of cascaded pixels is not
limited by signal transmission, and only the signal transmission speed is limited.
The data latch inside the chip generates different duty cycle control signals at the OUTR, OUTG, and
OUTB control terminals according to the received 24bit data. When the DIN terminal inputs the RESET
signal, all the chips synchronously send the received data to each section. The chip will re-accept the new
data after the end of the signal. After receiving the first 24bit data, the data port is forwarded through the DO
port. Before the chip receives the RESET code, the original output of the OUTR, OUTG, and OUTB pins
remains unchanged. After receiving a low level RESET code of 50μs or more, the chip outputs the pulse
width of the 24bit PWM data just received to the OUTR, OUTG, and OUTB pins. The pin and function of
the chip are shown in Figure 9-1 and Table 1.
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