UCS1903
1-wire RGB · Chipone Technology · ucs
- Channels
- RGB
- Bits / channel
- 8
- Supply
- 5–24 V
- PWM
- —
- Backup data
- no
- Packages
- 0
A ChipOne external driver IC, common in older and cheaper 12 V strip. At 400 kHz it is half the speed of the WS2812 family, which limits how many LEDs you can refresh at a usable frame rate.
Timing
| Source | T0H | T0L | T1H | T1L | Period | Rate | Reset | ± |
|---|---|---|---|---|---|---|---|---|
| fastled ↗ | 500 ns | 2000 ns | 2000 ns | 500 ns | 2500 ns | 400 kHz | 0 µs | — |
| FastLED also carries UCS1903B at 800 kHz (400/450/450). The plain UCS1903 is the 400 kHz part - half the data rate of a WS2812B, which matters on long runs. | ||||||||
Clones & compatibility
“Compatible” is never stated bare here — each relationship carries how strong the claim is, and what bites if you assume too much.
-
electrically similar
WS2811
Both are external three-channel drivers used in 12 V strip at a similar data rate, but the bit timings differ and they are not interchangeable without reconfiguring the driver. source ↗
Library support
- FastLED
UCS1903↗- WLED
UCS1903
Parts using this protocol
No package is catalogued for this protocol yet — it is seeded for family completeness, or it is a driver IC that drives external LEDs rather than shipping as an integrated package.
Dating evidence
Evidence, not a release date. A library commit proves the part existed by that date and says nothing about how long before.
- 2012-06-09 first library support FastLED — first commit introducing UCS1903 ↗ day