Pixel Protocol Overview: WS2815B

This pixel protocol was designed by World Semi in China. WS2815B offers all the same features as WS2815, but with slightly different timing, and at a constant current of 12mA, instead of 15mA. This means that this protocol is more suited to low-intensity applications. It uses 12V as its main power input for each chip, VDD, which is then dropped down to 5V inside each pixel for its logic requirements. This allows longer chains of pixels to driven in series, making it one of the most common protocols for pixel lighting displays. The control circuit and LEDs are integrated in a 5050 SMD package, which provides a small physical footprint for each pixel.

PixLite Support

Are you looking for WS2815B pixel drivers that work with Art-Net or sACN? All PixLite Mk3 products support WS2815B as an available Pixel IC type, so get in touch with us to find out how the lighting specialists at Advatek can support you in your pixel lighting project.

Technical Specifications

Clock Type Data-Only
Color Resolution 8 bits
Physical Package SMD5050 with integrated LEDs
RGBW See WS2814
Output Pixel Voltage 12V
Input Voltage 12V
PWM Rate 2000Hz
Suitable Camera Up to 67fps, see Refresh Rate and PWM Rate
Data Transfer Rate 800kbps
Redundant Data Line Yes

Color Specifications

Color Brightness Wavelength
Red 310 mcd 620 – 630 nm
Green 800 mcd 510 – 520 nm
Blue 190 mcd 465 – 475 nm

WS2815B Advantages

  • 12V operation, allows for long cable lengths and long chains of pixels
  • High PWM rate allows for filming these pixels with cameras up to 67fps
  • Redundant data line reduces chance of entire strip failure

WS2815B Disadvantages

  • Data-only restricts refresh rates to be limited by the speed of the protocol, which will generally be slow
  • Only 8 bits of data for each color makes dimming curves less smooth

Operational Behavior

WS2815 and WS2815B have been known to induce defects during manufacturing which cause the pixels to display erratic behavior for a brief moment after power up. If this is a concern, then SK6813 could be considered as an alternative. While many of the features of SK6813 are adopted from WS2815, the design of SK6813 reduces the chance of these same defects during manufacturing. This design sets it apart, making it a more reliable and stable choice.

Categories: Pixel LEDs