Clocked pixel input
Use MSB-first data and separate clock. A start frame is 32 zero bits.
APA102C addressable RGB LED pinout
A 5050 RGB LED with integrated drivers and separate clock and data signals, both forwarded to the next pixel.
5050 SMD, six contacts
6 contacts Current package5050 SMD, six contacts pinout
3 · GND
Supply and signal return.
All 6 pins
| Pin | Signal | Direction | Function |
|---|---|---|---|
| 1 | DI Input | Input | Serial data in. Data changes around the associated clock edges. |
| 2 | CI Input | Input | Serial clock input. Connect to controller clock or the previous pixel’s CO. |
| 3 | GND Return | Return | Supply and signal return. |
| 4 | VCC Supply | Supply | Nominal 5 V supply. |
| 5 | CO Output | Output | Forwarded clock output to the next pixel’s CI. |
| 6 | DO Output | Output | Forwarded serial data output to the next pixel’s DI. |
Signal assignments
Electrical limits
| Parameter | Limit | Conditions and source |
|---|---|---|
| Supply5.0 V nominal | 5.0 V nominal | The published DC characteristics list 5.5 V as the upper operating value. iPixel LED / Shiji Lighting APA102C specification, Electrical Characteristics |
| Input high≥0.7 × VCC | ≥0.7 × VCC | At 5 V, provide at least 3.5 V high at DI and CI. iPixel LED / Shiji Lighting APA102C specification, Electrical Characteristics |
| Pixel format32 bits | 32 bits | Three leading ones, five global brightness bits, then 8 bits each of blue, green and red. iPixel LED / Shiji Lighting APA102C specification, timing diagram |
Models and documents
The map uses the six-contact integrated LED outline in the iPixel APA102C sheet. Its separate controller block diagram uses different terminal numbers.
- APA102C
- Six-pad 5.0 × 5.0 × 1.4 mm integrated RGB LED.
- iPixel LED / Shiji Lighting APA102C specification· Manufacturer document mirrored by SparkFun. See the six-contact outline, electrical limits and framing.
- Source register· Document revisions, applicable order codes, consulted sections and available file checksums.