This is the Adafruit 12-Channel 16-bit PWM LED Driver - SPI Interface - TLC59711
This library is a modification of the Adafruit TLC59711 library, adding functions for RGB + CCT applications. Check out the original library for normal RGB LED's.
Every LED uses 6 channels to prevent spreading one LED over multiple chips, like:
Channel 6 being R of LED 1
Channel 7 being G of LED 1
Channel 8 being B of LED 1
Channel 9 being CW of LED 1
Channel 10 being WW of LED 1
Channel 11 being R of LED 2
Channel 12 being G of LED 2
Channel 1 of the next TLC59711 being R of LED 2
Instead we skip the 6th channel only allowing 2 LED's per chip.
Adafruit license text:
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Written by Limor Fried (Adafruit Industries). BSD license, check license.txt for more information All text above must be included in any redistribution