OptionalchangeChange the outputs on each register write's acknowledge rather than on the stop.
OptionalfrequencyThe PWM frequency every channel shares, in hertz; 50 for hobby servos.
OptionalinvertedInvert the output logic, for a board with no external driver.
OptionaloscillatorThe clock the prescaler divides, in hertz, for a board that drives EXTCLK.
OptionaltotemTotem-pole outputs when true, open-drain when false.
How a PCA9685 driver programs the part. A field left out keeps the part's own power-on setting: 200 Hz on the internal oscillator with totem-pole outputs.