Description

WS2812B Programmable RGB LED Chip 3535 SMD Package

• Package / footprint: 3.5 × 3.5 mm SMD (3535 family).

• Supply voltage (VDD): ≈ 5.0 V (typical operating range shown in datasheets around 4.5–5.5 V).

• Logic / protocol: Single-wire, NZR serial protocol at ~800 kHz timing (one 24-bit word per pixel: G,R,B). Timing examples: T0H ≈ 0.4 µs, T1H ≈ 0.8 µs, reset (Treset) > 50 µs. 8-bit PWM per color (256 levels).

• Typical current (per LED at full white): up to ~60 mA (≈20 mA per color channel) for classic WS2812B (5050). Many 3535 / “mini” variants use internal current-limiting and can show lower per-color currents (datasheet variants list values like ~12 mA per LED per color for some 3535 versions) — check the specific vendor datasheet for the exact number. Use 60 mA as a conservative design figure for full-white brightness unless your vendor datasheet states lower.

• Luminous output / LEDs: depends on manufacturer / bin. Typical mini 3535 parts list various cd/m² / mcd ranges — check vendor spec for exact brightness.

• Pinout: usually DIN, VDD, GND, DOUT (data in / data out chainable).

• Recommended ambient / storage temps: follow the vendor datasheet (typical operating −40°C to +85°C for many parts). Verify manufacturer sheet for exact limits.

Practical wiring & design notes

• Decoupling: place a 100 µF electrolytic (or similar bulk cap) across 5 V and GND near the first LED, plus 0.1 µF bypass caps if possible. This prevents supply dips when many LEDs switch on.

• Data line resistor: 220–470 Ω series resistor on the data line (between MCU and DIN) helps reduce ringing and protects the first LED. Many guides recommend it.

• Level shifting: if your MCU runs at 3.3 V and LEDs at 5 V, 3.3 V data sometimes works, but a proper level shifter (or a fast MOSFET-based level translator) is recommended for reliability on long runs.

• Power distribution: at full white use lots of current — inject 5 V power every ~30–50 LEDs (or according to your layout) to avoid voltage drop and color-shift. Calculate total current: I_total ≈ LEDs × I_per_LED_fullwhite (e.g. 100 LEDs × 60 mA = 6 A).

• Frame/refresh rate: ~800 kHz data rate → full-frame update time depends on LED count (e.g. ~37 FPS for ~900 LEDs at 24 bits/LED theoretical). Real-world animation speed varies with controller code.