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Meihua MHP1515 IC (unnamed)

1-wire RGB · MEIHUA · meihua

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

The driver inside Meihua’s 1.5 x 1.5 mm “IC RGB” PLCC. Meihua calls it only “IC”; the part-number infix ICRGB is the maker’s. The sheet says the IC is “easy to be compatible” (features list) but not with what.

Datasheets disagree with themselves: the electrical table header says VDD 3.0 to 5.5 V while the chip supply row says 3.5 to 5.5 V, and the pin table says 5 V +/-10 percent; the data-transfer heading says “TH+TL = 1.25 us +/- 600 ns” while the rows add to 1.2 us.

Refresh & flicker

PWM 1 kHz at IOUT 5 mA (page 11). Quiescent current 0.35 mA at 4.5 V; input high at least 2.8 V and low at most 1.6 V at VDD 5 V; output drive 12 mA per colour at VDS 1.0 V with a 0.6 V knee; DOUT source and sink 35 mA; DIN to DOUT delay 67 ns / 93 ns typical (page 10-11). The pin table says VDD is “5 V +/- 10 percent”. Page 13 maps each 8-bit colour value to a current from 0 mA (00) through 3 mA (40h) and 6 mA (80h) to 12 mA (FFh), about 0.047 mA per step.

Timing

Meihua MHP1515 IC (unnamed) bit timingMeihua MHP1515 IC (unnamed) bit timing: a zero bit is 300 nanoseconds high then 900 low; a one bit is 900 high then 300 low; tolerance plus or minus 50 nanoseconds; reset 200 microseconds low1 · Bit encoding, to scaleDINhighlowbit 0 period 1200 nsbit 1 period 1200 nsT0H 300 ±50 nsT1H 900 ±50 nsT0L 900 ±50 nsT1L 300 ±50 ns"0" bit"1" bit020040060080010001200140016001800200022002400time, ns± tolerance on each falling edge2 · 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 × ~1200 ns ≈ 28.8 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 ≥ 200 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 300 / T0L 900 · T1H 900 / T1L 300 ns · ±50 ns · period 1200 ns · reset 200 µs source: datasheet
SourceT0HT0LT1HT1LPeriodRateReset±
datasheet ↗ 300 ns 900 ns 900 ns 300 ns 1200 ns 833 kHz 200 µs 50 ns
Printed as T0H 0.3 us, T1H 0.9 us, T0L 0.9 us, T1L 0.3 us, each +/-0.05 us, reset above 200 us. The same table heading says “TH+TL = 1.25 us +/- 600 ns”, which does not match 0.3 + 0.9 = 1.2 us and whose tolerance is far wider than the +/-50 ns on the individual times; the individual times are recorded. Data is 24 bits, high bit first, in RGB order (page 13).

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 SK6805

    Inferred from the numbers only; the Meihua sheet never names OPSCO or any other IC. Its T0H 300 / T0L 900 / T1H 900 / T1L 300 ns (+/-50 ns) match the typical values OPSCO prints for the SK6805-EC15 (T0H 300, T0L 900, T1H 900, T1L 300), and Meihua resets after 200 us like the SK6805 sheet. But the pin numbering differs (Meihua 1 GND, 2 DO, 3 VDD, 4 DI; SK6805-EC15 1 DIN, 2 VDD, 3 DOUT, 4 GND), colour order is RGB here where OPSCO's SK6805 sends GRB, and the +/-50 ns tolerances are tighter than OPSCO's windows. Not tested. source ↗

  • electrically similar of this Nationstar FC-RGBC4020 IC (unnamed)

    Same typical timing (300 / 900 / 900 / 300 ns +/-50 ns) and reset above 200 us as the Meihua MHP1515 sheet; Nationstar sends GRB where Meihua says RGB. Neither sheet names an IC or says one is derived from the other.

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.

  • 2021-12-07 datasheet revision Meihua MHP1515ICRGBDT data sheet Rev.1, date on the cover (Issue No LPDS-0002722) ↗ day