Electronic module|External control integrated LED light source WS2812 module---hardware introduction

Module Introduction

WS2812 is an intelligent external control LED light source integrating control circuit and light emitting circuit. Its appearance is the same as a 5050LED lamp bead, and each element is a pixel. The pixel contains an intelligent digital interface data latch signal shaping and amplifying drive circuit, and also includes a high-precision internal oscillator and a 12V high-voltage programmable constant current control part, which effectively ensures that the color of the pixel light is highly consistent.

The data protocol adopts the single-line return-to-zero code communication method. After the pixel is powered on and reset, the DIN terminal receives the data transmitted from the controller. The 24bit data sent first is extracted by the first pixel and sent to the inside of the pixel. The remaining data is reshaped and amplified by the internal shaping processing circuit, and then forwarded and output to the next cascaded pixel through the DO port. Every time a pixel is transmitted, the signal is reduced by 24 bits. Pixels adopt automatic shaping and forwarding technology, so that the number of cascaded pixels is not limited by signal transmission, but only limited by signal transmission speed requirements.

LED has the advantages of low voltage drive, environmental protection and energy saving, high brightness, large scattering angle, good consistency, ultra-low power, and ultra-long life. The control circuit is integrated on the LED, the circuit becomes simpler, the volume is smaller, and the installation is easier.

Physical map:

The main application areas include :

• LED full-color luminous string lights, LED full-color modules, LED full-color soft light strips and hard light strips, LED guardrail tubes.
• LED point light source, LED pixel screen, LED special-shaped screen, various electronic products, electrical equipment marquee.

Module Features

• The control circuit and the RGB chip are integrated in a 5050-package component to form a complete external control pixel.
• Built-in signal shaping circuit, after any pixel receives the signal, it will be output after waveform shaping to ensure that the line waveform distortion will not accumulate.
• Built-in power-on reset and power-off reset circuits
• The three primary colors of each pixel can realize 256 levels of brightness display, complete the full true color display of 16,777,216 colors, and the scanning frequency is not lower than
  400Hz/s
• Serial cascading interface, which can complete data receiving and decoding through one signal line
• There is no need to add any circuit when the transmission distance between any two points does not exceed 5 meters.
• When the refresh rate is 30 frames per second, the cascaded number of low-speed mode is not less than 512 points, and the high-speed mode is not less than 1024 points
• Data sending speed up to 800Kbps
• Highly consistent light color, high cost performance

Mechanical Dimensions

Hardware pin definition:

Terminal function

Maximum rating

LED characteristic parameters

Typical application circuit

The principle is as follows: the physical diagram above
a WS2812B schematic image is a module composed of four WS2812B, then the schematic diagram is as follows