addressable.wiki

Guiguang GL2121 (unnamed IC)

1-wire RGB · Guiguang Light · guiguang

Channels
RGB
Bits / channel
8
Supply
3.5–5.5 V
PWM
1.5 kHz
Backup data
no
Packages
1

The IC in Guiguang’s 2.1 x 2.1 mm “Fantasy colour” LED. The sheet names no IC; its timing table differs from the sibling GL sheets, so it is kept separate.

Datasheets disagree with themselves: the absolute-maximum table prints the supply as “0.5-5.5 V” (page 4) while the electrical table says 3.5 / 5 / 5.5 V; the former is taken as a typo and the latter recorded.

Refresh & flicker

PWM 1.5 kHz, data rate 800 kHz, forwarding delay 0.16 us typical / 0.30 us maximum (page 5). Chip supply 3.5 / 5 / 5.5 V, input thresholds 0.65 x VDD (high) and 0.3 x VDD (low), quiescent “0.7 uA” as printed (probably mA).

Timing

Guiguang GL2121 (unnamed IC) bit timingGuiguang GL2121 (unnamed IC) bit timing: a zero bit is 250 nanoseconds high then 1000 low; a one bit is 850 high then 400 low; reset 80 microseconds low1 · Bit encoding, to scaleDINhighlowbit 0 period 1250 nsbit 1 period 1250 nsT0H 250 nsT1H 850 nsT0L 1000 nsT1L 400 ns"0" bit"1" bit02505007501000125015001750200022502500time, ns2 · One frame: 24 bits, most-significant bit firstDIN170110010007100110101700101100bitch 1 · 8 bitsch 2 · 8 bitsch 3 · 8 bitsChannel order not recorded for this protocol · frame = 24 × ~1250 ns ≈ 30 µs · example data, first bits 1 0 1 …3 · RESET / latchlast bits of frame 1first bits of frame 2LEDs latch the data they receivedRESET: DIN low ≥ 80 µs (not to scale)4 · Cascade: each DOUT feeds the next DINMCULED 1DINDOUTLED 2DINDOUTLED NDINDOUTLED 1 keeps the first 24 bits, re-shapes the signal and sends the rest out on DOUT;LED 2 keeps the next 24, and so on. The last LED's DOUT is left unconnected.
T0H 250 / T0L 1000 · T1H 850 / T1L 400 ns · period 1250 ns · reset 80 µs source: datasheet
SourceT0HT0LT1HT1LPeriodRateReset±
datasheet ↗ 250 ns 1000 ns 850 ns 400 ns 1250 ns 800 kHz 80 µs —
Mostly typical values, and the table is sparse: T0H 250 typ / 300 max (no minimum), T0L 1000 typ (no min or max), T1H 620 min / 850 typ / 1000 max, T1L 400 typ (no min or max), symbol period 1200 min / 1250 typ, reset at least 80 us. The typical highs and lows add up to the 1.25 us symbol period (250 + 1000 and 850 + 400). Low time of a 0 or 1 code under 20 us. 24 bits per LED, high bit first, in RGB order.

Clones & compatibility

“Compatible” is never stated bare here — each relationship carries how strong the claim is, and what bites if you assume too much.

Library support

Not checked against library source.

Parts using this protocol

Dating evidence

Evidence, not a release date. A library commit proves the part existed by that date and says nothing about how long before.

  • 2023-05 datasheet revision Guiguang GL2121RGB01H-T specification, release date (发布日期) May 2023 on the cover ↗ month