2 Smart LEDs Data and Timing Theory

The Smart LED is waiting for 24-bit color format that is present in the DIN pin after a reset period. The communication is serial, unipolar and RZ communication mode. The order of data is GRB with the most significant bit first, as is shown in Figure 2-1

Figure 2-1 Data Order in a Smart 24-Bit GRB LED

Regarding the timing for each of the color bits, it is expected that the data signal starts with a high level and returns to zero between pulses. The period of time in high of each color bit determines the value Logic 0 or Logic 1 with a full period that must be around 1200nS typically. Table 2-1 and Figure 2-2 shows the Data Transfer Time for some of the smart LED models in the market. A period larger than 200uS indicates a reset code.

Figure 2-2 Logic Symbol Timing