new WS2821 IC in the 5050 RGB LED,it shall have following features:
1.WS2821’s data signals are in parallel connection,any LED failures won’t affect any other LEDs,whole effect won’t be effected at all.
2.WS2821’s protocol supply the DMX512 standard protocol,so it is compatible with the standard
DMX512 control panels,so all WS2821 series products can be controlled by the DMX control panels directly.
3.WS2821 has address storage function inside, once writing address,shall be permanent preserved.
Following diagram is our recommend application:
For the package,we have two different package types for reference:
1.Package type A:
2.Package type B:
For type A:Here are two shortcomings:
a).RGB chip is located in the side,not the center,so emitting color shall be at side as well.
b).Since it is not a customize frame,so for heat dissipation and steady shall checked by the market as well.
For type B:We plan to develop this new led frame as well,thus will guarantee the RGB chip existing in the center,heat dissipation being better!
If the protocol is really DMX, that puts the data rate at about 180kbps, or more than 4 times slower than the ws2812. Also, dmx512 will cap a single strand length at 170 rgb LEDs. It’ll be interesting to see a full data sheet when it comes out, but I’m hard pressed to imagine this becoming overly popular, as it feels like multiple steps backwards
dmx is a bit of a joke now with leds. our new install required 8 new universes, which is a good few ££’s with all the ancillary costs.
hard work convincing light jocks to use proprietary hardware / software… they always want full control of everything…
Dmx really wasn’t designed with pixel level control in mind at least not when you’re talking about hundreds of rgb pixels. Also, that 180kbps data rate is pretty terrible.
With these lights it isn’t even like you can just stuff dmx at them (and the wiring makes me question if it is dmx - I thought dmx required a pair of data lines?). The separate “set address” and data lines add a bunch of complexity.
The ability to gracefully handle a pixel dying, however, is a nice feature.
What I wouldn’t give for a LPD8806-level-speed 8-bit TRUE analog constant current driver (not PWM driven) embedded in an RGB 5050 SMD. A man can dream.
