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WS2818A is a 3-channel LED driver control circuit, its internal includes an intelligent digital port data latch and signal reshaping amplification drive circuit. Also includes a precision internal oscillator and a 12V voltage programmable constant current control part, which achieves a highly consistent color effect. WS2818A has strong features in Signal Break-point Continuous Transmission, it adopts dual signal transmission, and these signals are able to work together without interaction. The user can select the first chip DIN/BIN as the control signal input pin, and the follow-up cascade chips will automatically identify the output signal released by the first chip which does not affect the whole display effect. WS2818A adopts a Single-line Return-to-Zero communication protocol. After the chip gets power-on reset, the DIN port receives data from the controller, the first chip collects initial 24bit data and then sent to the internal data latch, and the other data which is reshaped by the internal signal reshaping amplification circuit sent to the next cascade pixel through the DO port. The data is reduced by 24 bits after being transmitted through every pixel. 

Since WS2818 adopts auto-reshaping transmit technology, making the pixel cascade numbers are not limited to the signal transmission, but to signal transmission speed. When BIN works as a control signal receiving interface, its control data is 24bit more than the DIN interface, so as to ensure that the two ways to control the number of pixels are the same Based on the received 24bit data, the internal data latch generates different duty cycle control signals in the OUTR, OUTG, OUTB port. All chips synchronous send the received data to each segment when the DIN port input is set to signal. It will receive new data again After the reset signal finished. Before a new reset signal received, the control signal of the OUTR, OUTG, OUTB pin unchanged. The chip exports PWM data to OUTR, OUTG, OUTB pins, after receive alow voltage reset signal the time retain over 280μs

Features

  • RGB output port withstands voltage 5V, DIN port withstands voltage 9V.
  • Adopts the built-in signal reshaping circuit to achieve the signal waveform shaping, and thus no signal waveform distortion takes place.
  • Built-in power-on reset and brown-out reset circuits.
  • The gray levels of each pixel are 256 levels, which achieves a €š¬œ256*256*256=16777216€š¬� full-color display, and the refresh frequency reaches to 2KHz/s.
  • Serial cascade interface, data receiving, and decoding depend on just one signal line.
  • Dual-signal wires version, signal break-point continuous transmission.
  • Any two points the distance of more than 3m transmission signal without any increase circuit.
  • When the refresh rate is 30fps, cascade numbers are far more than 1024 points.
  • Data transmitting at speeds of up to 800Kbps.
  • Good color consistency reliability, and high cost-effectiveness.

Applications

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  • Lighting stage costumes, innovative gadgets, or any other electronic products
  • Specification

    Working Voltage DC 5V
    Length 1 meter 
    LEDs per Meter 60
    Waterproof No
    Data Transmission Protocol Single-line Return-to-Zero communication protocol
    Data Transmission Speed 800Kbps
    Reset Time >280µs
    Gray Level per Pixel 256
    Operating Temperature -25°C~85°C
    Colour RGB (Controlled by 3-Channel Driver)

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