WS2811

@@ -0,0 +1,43 @@+# WS2811++**Worldsemi** · LED Drivers · SOP-8++WS2811 from Worldsemi, in a SOP-8. Pinout and pin descriptions extracted from the datasheet (via LCSC) by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | OUTR | output | RED channel constant-current PWM sink output. 20V max port voltage, typical sink current 16 mA (14-18 mA range) at DC=5V with DIN=FFh. Drives LED cathode(s) with series ballast resistor Rd sized to supply voltage. |+| 2 | OUTG | output | GREEN channel constant-current PWM sink output. 20V max port voltage, typical sink current 16 mA. Delayed turn-on relative to other channels to reduce supply ripple at frame refresh. |+| 3 | OUTB | output | BLUE channel constant-current PWM sink output. 20V max port voltage, typical sink current 16 mA. 256-level PWM at 4 kHz scan frequency. |+| 4 | GND | power_in | Ground reference for both signal and power. VSS = 0V. |+| 5 | DO | output | Cascade data output. Reshaped/retimed forward of remaining bits after this IC consumes its first 24 bits. Drives next stage's DIN. Low-level output current >=10 mA at Vo=0.4V; propagation delay tPLZ <=300 ns (CL=15pF, RL=10kΩ). Withstands transient 24V short without damage. |+| 6 | DIN | input | Single-wire serial data input (NRZ, 800 kbps). VIH >= 0.55*VDD, VIL <= 0.3*VDD, hysteresis ~0.35V. First 24 bits (R7..R0, G7..G0, B7..B0, MSB first) are latched by this IC; remaining bits are forwarded through DO. RESET frame is low >=280 µs. Port withstands 9.5V and transient 24V short. |+| 7 | NC | unconnected | No internal connection. Leave floating or tie to any potential per PCB layout convenience. |+| 8 | VDD | power_in | Logic supply for the IC. Operating range +3.5 to +5.7 V (absolute max), typical 4.5-5.5V. Quiescent current ~0.3 mA. On-chip shunt regulator allows operation from supplies up to 24V via an external series dropping resistor (Rd = 150Ω @5V, 4.7kΩ @12V, 10kΩ @24V) with a 1 µF decoupling capacitor to GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Worldsemi |+| Package | SOP-8 |+| Category | LED-drv |+| Pins | 8 |++## CAD (KiCad official)++- Symbol: `WS2811`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Worldsemi datasheet](https://datasheet.lcsc.com/datasheet/pdf/6d22d3665addacf1ad7c32678eb754ae.pdf) (8 pp, sha256 `18c5e95266753d5c`, retrieved 2026-08-17, tier: lcsc)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/ws2811-datasheet.pdf)

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