Adafruit Industries 1378

The WS2811 is a 3-channel driver IC designed specifically for LEDs. It integrates an intelligent digital port data latch and signal reshaping amplifier driver circuit, along with a precision internal oscillator and a 12V programmable constant-current output driver. To reduce power supply ripple, the 3 output channels feature a staggered turn-on function.

This IC uses single NZR communication mode. After power-on reset, the DIN port receives data from the controller. The first IC captures the initial 24-bit data and latches it to the internal data register; the remaining data is reshaped by the internal signal reshaping amplifier circuit and forwarded through the DO port to the next cascaded IC. With each chip transmission, the data stream is reduced by 24 bits. The IC employs automatic reshaping transmission technology, so the number of cascaded chips is not limited by signal transmission degradation — only by signal transmission speed.

The IC's data latch generates signals with varying duty cycles on the OUTR, OUTG, and OUTB ports based on the received 24-bit data. When a reset signal is applied to the DIN port, all chips simultaneously transfer their received data to each segment. After the reset signal ends, the IC resumes receiving new data. The control signals on the OUTR, OUTG, and OUTB ports remain unchanged until a new reset signal is received. The IC accurately outputs the received PWM data to the OUTR, OUTG, and OUTB ports, and holds the state after receiving a low-voltage reset signal lasting more than 50μs. Available in SOP8 and DIP8 packages.

• Output port voltage rating: 12V. Built-in Zener diode — when powered by 24V supply, only a single resistor on the IC's VDD pin is required.
• 256-level grayscale adjustment; scan frequency ≥ 400Hz/s.
• Built-in signal reshaping circuit — reshapes signals before forwarding to the next cascaded driver, preventing waveform distortion accumulation.
• Built-in power-on reset and power-off reset circuits.
• Cascade ports transmit signals via single-wire.
• Signal transmission over distances exceeding 10m between any two points without additional signal conditioning circuitry.
• At 30fps refresh rate: low-speed mode supports ≥ 512 cascaded nodes; high-speed mode supports ≥ 1024 cascaded nodes.
• Supports two data transmission modes: up to 400Kbps and 800Kbps.

• LED decorative lighting
• Indoor/outdoor LED video or irregular displays