adafruit/Adafruit-Raspberry-Pi-Python-Code — pull request #101 by sebastianludwig (2014-11-29 20:08:28+00:00)
Title: Use PCA9685 auto increment

I stumbled upon this when optimizing my application. By utilizing the address auto incrementation feature only 6 bytes need to be written for a PWM update, instead of 12.

Seb