This is a built-in PWM driver and a clock using i2c communication. This means that this will be very different from the TLC5940 series. You 't need to constantly send signals to occupy your microcontroller! It is 5V compatible, which means you can also control it with a 3.3V microcontroller and safely drive it to the 6V output (3.4+ positive voltage is also ok when you want to control the white or blue ) The 6 address select pins allow you to hook up 62 driver boards on a single i2c bus, for a total of 992 PWM outputs. That would be a very resource. About 1.6Khz adjustable frequency PWM output Ready to output 12-bit resolution for stepper motors, which means 4us resolution at 60Hz update rate Configurable push-pull or open-circuit output Output enable pin quickly disables all outputs The PCA9685 chip is wrapped in the center of the small board Power input terminal Green power indicator It is convenient to insert 16 servo motors at a time in 4 sets of 3-pin connectors (the plug of the servo motor is slightly than 0.1inch, so you can put 4 pairs of 0.1inch connectors) Input reverse polarity protection on terminal block Cascade design Put a capacitor on the V+ line (you will need it in some cases) The peripheral input voltage depends on this 10V1000uf capacitor Put a 220 ohm series resistor on all PWM output lines to protect them and drive LED . Colour: blue Material: PCB Size: 60x25mm Package Contents: 1 * Servo driver board Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/ - 1-3cm.