It seems to me that RP2 and ARM devices in general are more susceptible to over-voltage than others are when those over-voltages are current limited; that is it's more over-current, sourced or sunk, which will damage the pins than over-voltage itself.I don't believe there's any indication that RP2040 is any worse (or better) than other comparable chips. Pins typically get blown up by ESD or overvoltage.
For example you can't feed RS232C straight into an RP2 by using a large current limiting resistor as you will often be able to do with PIC and other chips. At one point Microchip had an Application Note detailing how to connect directly to mains voltage signals merely using current limiting but that has since been deprecated.
And the RP2 is not fully "5V tolerant", may be destroyed or damaged if a 5V signal is applied while the IOVDD is unpowered or below 3V3. Many other microcontrollers will be unaffected by that.
That doesn't necessarily make it worse than other microcontrollers but could lead to damage a user may not have anticipated.
If the OP's pull-down driver has been damaged and no longer works, it seems plausible this was caused by over-voltage burning that pin's driver out, perhaps by connecting it to a 5V signal in circumstances when such a signal must not be applied ?
Statistics: Posted by hippy — Mon Aug 26, 2024 7:16 pm