General • Re: Alert pin INA228 to RP2040

I have GPIO17 ( pin 18 ) - PIO0 reserved for that. Of course I want to have an interrupt on that pin.
What is the safest way to do that? Do I need a 330-1K resistor in serie or/and a 100n capacitor to ground? Or?

I don't think a series resistor is going to do you any good. The datasheet says:

Note that the ALERT pin is an
open-drain output that must be pulled-up by a resistor. The ALERT pin is active-low by default and can be
configured for active high function using the APOL control bit.

You're going to want something like a 10 kΩ pull-up to 3.3 V (e.g., Pico pin 36, 3V3 (out)). I wouldn't think you'd need a capacitor, unless you are worried about very frequent ALERTs causing "interrupt storms", in which case you could use a capacitor to form a low-pass filter.

Statistics: Posted by carlk3 — Sun Dec 10, 2023 8:57 pm

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