When you are in your project, encountered a case where the micro-controller chip pwm output pin is not enough, then this PCA9685 16 road steering to help you solve this problem, as long as your main chip with I2C communication function, it is possible to make the main chip and PCA9685 communicate simultaneously achieve a plurality of servo control. It is a a use I2C communication, built PWM drive and a clock. This means that it will TLC5940 series are very different. You do not need to constantly send signals occupy your microcontroller. It is 5v compatible, which means you can also use 3.3v microprocessor controlled and safe driving to 6v output.