16-bit version of the WS2801 chip

[The Master]

I've been using the WS2801 chips for a while now but I'm struggling to get my lights fading smoothly with only 256 steps.
Does anyone know if there's a 16-bit version? Google didn't turn up any results but I don't have a part number to search on.

I have also considered dithering the normal 8-bit ones but I'm not sure if I can get the refresh rate high enough for that to work well.
I'd prefer an actual 16-bit chip if one exists.

[Ioannis]

I do not know if there is a 16bit version of the chip but I wonder why you need more steps (meaning more MCU power hungry code).

Aren't smooth enough the 256 steps?

Ioannis

[HenrikOlsson]

Don't know about a 16bit version but I just stumbled across the LDP1886 which is a 3x12bit LED driver.
That's 4096 levels per channel or 68.7 billion colors.

I have not looked at the datasheet to see if it's otherwise compatible with the WS2801 etc series.

/Henrik.

[The Master]

256 steps are alright for color mixing and for big fades but quite often I'll have the lights down to number 3. They are very dim but they can't really fade out with just 3 steps and it looks a bit odd.
Processing power isn't much of a problem. I use PIC24FJ64GA004 chips to control them which are 16-bit anyway and have plenty of RAM/cycles.

I've got another one of these that can read 8 x 16-bit 44.1KHz WAV files from an SD card at the same time, mix them with 8-bit volume control and output to 4 x 16-bit DACs.
The lighting controller has 36 outputs (12 x RGB) but the refresh rate is much lower.

Thanks for the LDP1886 suggestion 12-bit would still give me 24 steps instead of 3. I'll have a read up on them.

[Ioannis]

Hmm, I see. For high lumen, high power, sure you need more steps.

Interesting.

How are you programming the dsPIC? In C?

Ioannis

[pedja089]

PIC24 isn't dsPIC. PIC24 can be programmed in proton basic. I have dongle, but newer try it....
Or in microbasic, but I don't recommend it. I fon't have nice experience with it.