Overview
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.
WS2815B can come as an RGB or an RGBW pixel IC. Although both physical chips exist, the RGB chip is generally more commonly available.
WS2815B pixel protocol
Specifications
PixLite Mk1 | |
PixLite Mk2 | |
PixLite Mk3 | |
Clock Type | Data-Only |
Color Resolution | 8 Bits |
Current Control | |
Physical Package | SMD5050 with integrated LEDs |
RGB | |
RBGW | |
Input Voltage | 12V |
Output Pixel Voltage | 12V |
PWM Rate | 2000Hz |
Suitable Camera | Up to 67fps |
Data Transfer Rate | 800kbps |
Redundant Data Line |
Colors
Color | Brightness | Wavelength |
|---|---|---|
Red | 310 mcd | 620 – 630 nm |
Green | 800 mcd | 510 – 520 nm |
Blue | 190 mcd | 465 – 475 nm |
White | 1500 - 2500 mcd | 2800 – 7000 K |
Considerations for Use
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
- Option for white LED allows for more color mixing options
Disadvantages
- Data-only restricts refresh rates to be limited by the speed of the protocol, which can 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.
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.
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