What is the maximum number of PWM outputs that can be controlled?

Up to 992 PWM outputs can be controlled by stacking up to 62 of these on a single i2c bus.

Can it be controlled from a 3.3V Arduino?

Yes, it is 5V compliant, allowing control from a 3.3V Arduino and still safely driving up to 6V outputs.

Each output has a 12-bit resolution, providing about 4us resolution at a 60Hz update rate.

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Control up to 992 PWM outputs with only two I2C pins

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Adafruit 16-Channel 12-bit PWM/Servo Shield - I2C interface

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Question : What is the maximum number of PWM outputs that can be controlled?
Answer : Up to 992 PWM outputs can be controlled by stacking up to 62 of these on a single i2c bus.
Question : Can it be controlled from a 3.3V Arduino?
Answer : Yes, it is 5V compliant, allowing control from a 3.3V Arduino and still safely driving up to 6V outputs.
Question : What is the resolution for each output?
Answer : Each output has a 12-bit resolution, providing about 4us resolution at a 60Hz update rate.

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Adafruit 16-Channel 12-bit PWM/Servo Shield - I2C interface