Can pwm be done on a PCF8575?

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quinn123
 
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Can pwm be done on a PCF8575?

Post by quinn123 »

Hi,

Can PWM be done on a PCF8575? I've searched the internet and can't seem to find examples as I can for PCA9685. With the PCA9685, I can control the brightness of an LED via PWM. Can I do that similarly on the PCF8575?

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adafruit_support_mike
 
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Re: Can pwm be done on a PCF8575?

Post by adafruit_support_mike »

Not really.

The PFC8575 doesn't have any internal PWM hardware, so you'd have to drive the GPIO pins high and low from the microcontroller. That would have to go through the I2C bus, so it wouldn't be terribly fast.

If you want a GPIO extender that can do PWM internally, take a look at our Seesaw boards:

https://www.adafruit.com/product/5233
https://www.adafruit.com/product/3657

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