16-Channel 12-bit PWM/Servo Driver - I2C interface - PCA9685 (ID: 815)

Product Code: 1855
by Adafruit
£14.90 inc VAT
£12.42 ex VAT
12 in stock.

More available in 5-7 days.
Available for backorder (more info)

With this 16 channel 12-bit PWM servo driver, using only two pins, you can control 16 free-running PWM outputs! You can even chain up 62 breakouts to control up to 992 PWM outputs!

The board is an i2c-controlled PWM driver with a built in clock. That means that, unlike the TLC5940 family, you do not need to continuously send it signals tying up your microcontroller, its completely free running!

This product comes with a fully tested and assembled breakout as well as 4 pieces of 3x4 male straight header (for servo/LED plugs), a 2-pin terminal block (for power) and a piece of 6-pin 0.1" header (to plug into a breadboard). A little light soldering will be required to assemble and customize the board by attaching the desired headers but it is a 15 minute task that even a beginner can do.

  • It is 5V compliant, which means you can control it from a 3.3V microcontroller and still safely drive up to 6V outputs (this is good for when you want to control white or blue LEDs with 3.4+ forward voltages)
  • 6 address select pins so you can wire up to 62 of these on a single i2c bus, a total of 992 outputs - that's a lot of servos or LEDs
  • Adjustable frequency PWM up to about 1.6 KHz
  • 12-bit resolution for each output - for servos, that means about 4us resolution at 60Hz update rate
  • Configurable push-pull or open-drain output
  • Output enable pin to quickly disable all the outputs

Board extras

  • Terminal block for power input (or you can use the 0.1" breakouts on the side)
  • Reverse polarity protection on the terminal block input
  • Green power-good LED
  • 3 pin connectors in groups of 4 so you can plug in 16 servos at once (Servo plugs are slightly wider than 0.1" so you can only stack 4 next to each other on 0.1" header
  • "Chain-able" design
  • A spot to place a big capacitor on the V+ line (in case you need it)
  • 220 ohm series resistors on all the output lines to protect them, and to make driving LEDs trivial
  • Solder jumpers for the 6 address select pins

Specifications:

  • Dimensions: (no headers or terminal block) 2.5" x 1" x 0.1" (62.5mm x 25.4mm x 3mm)
  • Weight: (no headers or terminal block): 5.5grams
  • Weight: (with 3x4 headers & terminal block): 9grams
  • This board/chip uses I2C 7-bit address between 0x60-0x80, selectable with jumpers