5V compliant, and still talks to a 3.3V microcontroller. 6 "address select" pins for configuring up to 62 ICs on a single I2C bus PWM frequency adjustable up to approximately 1.6kHz12-bit frequency resolution (equates to about 4s resolution at 60Hz refresh rate) Configurable as push-pull or open-drain output Output enable pin available for outside-the-microcontroller "shut it down!" control.