Worldsemi WS2813C-2121

WS2813C - 2121 is an intelligent externally-controlled LED light source that integrates the control circuit and light-emitting chip into a single package. Its form factor is identical to a standard 2121 LED, with each component functioning as one pixel. Each pixel incorporates a smart digital interface, data latch, signal reshaping and amplification driver circuit, reverse polarity protection circuit, along with a high-precision internal oscillator and high-precision constant current control module, effectively ensuring excellent color consistency across pixels. Dual-signal transmission is implemented so that a single damaged pixel does not affect the overall color display. The data protocol uses a single-wire return-to-zero communication method. After power-on reset, the DIN port receives data from the controller; the first pixel extracts 24-bit data and stores it in the internal data latch, while the remaining data is reshaped and forwarded to the next cascaded pixel via the DO port — each pixel transmission reduces the signal by 24 bits. With automatic signal reshaping and forwarding technology, the number of cascaded pixels is not limited by signal transmission constraints, only by signal transmission speed requirements. The port scan frequency of up to 2KHz ensures no flickering when captured by high-definition cameras, making it suitable for high-speed moving applications. A RESET time of 280μs or more prevents false resets during interruptions, enabling support for lower-frequency, cost-effective MCUs.

• IC control circuit and LED point light source share a single power supply.
• Control circuit and RGB chip integrated in a 2121 package component, forming a complete externally-controlled pixel.
• Built-in signal reshaping circuit; each pixel reshapes the waveform before forwarding, preventing cumulative waveform distortion along the line.
• Each pixel supports 256 brightness levels per primary color, enabling full 16777216-color true color display.
• Built-in power-on reset and power-down reset circuits.
• Port scan frequency: 2KHz/s.
• Serial cascade interface; data reception and decoding via a single signal line.
• Breakpoint resume transmission with an additional signal line for dual-channel signal transfer, ensuring no impact on overall display when a single pixel fails.
• No additional circuitry required when transmission distance between any two points does not exceed 2 meters.
• Cascade count ≥1024 pixels at a refresh rate of 30 frames/second.
• Data transmission speed up to 800Kbps.
• Intelligent reverse polarity protection; no component damage when 5V supply is connected in reverse.
• No external electronic components required, including capacitors.

• LED pixel displays
• Advertising displays
• Shaped displays
• Consumer electronics