Arduino I2C 4CH PWM Extender

Other Hardware General Electronics
1

Just as the title says, I need an I2C PWM 4CH extender that has a decent library. The 3CH could do the job, but 4CH would be a better choice for me.
So far I worked with SX1509 and PCA9685, but those are overkill. Can someone point me to some IC?

The PCA9633 is not available to me.
There is a TLC5973, but from what I saw, there are people that didn't make it to work. And it is not I2C. This one is available, but I am not sure how to interface it. Maybe it is the one I should use...
PCA9536 from what I saw can not do PWM on its output.

Else?

2

Please add links to the data sheets of the chips.

3

I ask for else. :slight_smile:
The question is do you know some other IC that could fit?

4

Not an IC, but you could use any Arduino compatible device or chip with the I2Cwrapper firmware/library and the PinI2C module. It allows you to control any pin of the Arduino slave/target over I2C, using the usual Arduino functions like analogWrite() etc., as demonstrated in this example (the pins object represents the slave/target Arduino device).

Jan

1 Like
5

I need a 4CH IC with an I2C interface and decent Arduino lib. 3CH will do the job, but 4CH would be better.

Did any of you used something that could fit?

6

I believe PCA9633 is just around the corner. There is a lib available, so it could do the job.

Now, I made a few designs of driving LED strip using PWM as source:

pca9865
pca98651032×408 24.8 KB

If I use a PCA9633, it should be rearanged in a sink. Any idea how to do that? To add a transistor?

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pca9633
pca9633790×560 29.1 KB

Something like this?

8

Q7 never can go on.

9

Please explain. The PCA9633 can source (10mA) or sink (25mA).
Do you mean inverted PWM. That can be done in software.

The PCA9685 (12-bit) is a much better choice for dimming to low light values.
Leo..

10

I need a 4ch IC. The one you pointed out is a 16ch. Any suggestion for other 4ch IC?

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