16-Channel 12-Bit PWM/Servo Driver – PCA9685

The boards can be daisy-chained, setting the address (from A0 to A5) with solder jumpers, up to 62 boards on a single I²C bus, for a total of 992 outputs. The maximum current per pin is 25 mA and every PWM output has a 220 ohm resistor on it (keep that in mind if you are driving LEDs). 

Each PWM channel works completely independently, but they must all run at the same PWM frequency. LEDs probably want 1 kHz while servos need 60 Hz, so you cannot use part of the board for LEDs at 1 kHz and part for RC servos at 60 Hz.

• RC servo supply (+V pin): max 6 VDC (leave it unconnected if you are not using RC servos)
• Can be daisy-chained, setting the address (from A0 to A5) with solder jumpers, up to 62 modules on a single I²C bus, for a total of 992 outputs
• PWM frequency from 40 Hz to 1 kHz
• 12 bit resolution on each output – for RC servos that means a resolution of 4 µs at a 60 Hz update rate
• Output configurable as push-pull or open-drain
• OE: output enable pin. It can be used to enable and disable all the outputs quickly

• Adafruit library
• PCA9685 datasheet