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When you are in your project encountered a case where the microcontroller chip pwm output pin is not enough then this PCA9685 16 road steering to help you solve this problem as long as your main chip with I2C communication function it is possible to make the main chip and PCA9685 communicate simultaneously achieve a plurality of servo control. It is a a use I2C communication built PWM drive and a clock. This means that it will TLC5940 series are very different. You do not need to constantly send signals occupy your microcontroller. It is 5v compatible which means you can also use 3.3v microprocessor controlled and safe driving to 6v output.
Features:
Adjustable frequency PWM up to about 1.6 KHz
Configurable pushpull or opendrain output
Output enable pin to quickly disable all the outputs
12bit resolution for each output for servos that means about 4us resolution at 60Hz update rate
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