WS2818A is a 3-channel LED driver control circuit, its internal include an intelligent digital port data latch and signal reshaping amplification drive circuit. Also include 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, 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 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 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. The data reduced by 24bit after 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
- RGB output port withstands voltage 5V, DIN port withstand 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 of 256 levels, which achieves “256*256*256=16777216” 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 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, high cost-effective.
- Guardrail tube series, point light display series, flexible/rigid strips series, module series applications.
- Lighting stage costumes, innovative gadgets, or any other electronic products
|Working Voltage||DC 5V|
|LEDs per Meter||60|
|Data Transmission Protocol||Single-line Return-to-Zero communication protocol|
|Data Transmission Speed||800Kbps|
|Gray Level per Pixel||256|
|Colour||RGB (Controlled by 3-Channel Driver)|