General • Re: RP2040 pull-down resistance below data sheet ranges

What series resistor are you using?

I've got an input signal that's ~28.5V when high, and I was using 470kΩ series resistors. I was seeing a 1.8V to 2V signal at the input.

I have since changed to 200kΩ resistors, which should give me OK voltage levels even with a 20kΩ input resistance (and without loading the 30V drivers too much). Of course with a 50-80kΩ input resistance, the diodes will clamp to 3.6V or so.

Statistics: Posted by nedkonz — Mon Feb 12, 2024 1:11 pm

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