Hi
I know Eben has said in the past that the RP2040 GPIOs can be driven by 5v inputs as long as the pin is not used as an output.
I have an odd requirement where a pin needs to be either pulled to gnd or left floating: there is an external 2k pullup resistor to 5v and a second sink that can independently pull the line to gnd. My thought is thus that I could set the output value to 0 and enable or disable the output mask depending on whether I need a logic low or logic high.
Given that I will never be outputting logic-high to the pin, does that pin require a voltage-shifter?
Thanks!
Geoff
I know Eben has said in the past that the RP2040 GPIOs can be driven by 5v inputs as long as the pin is not used as an output.
I have an odd requirement where a pin needs to be either pulled to gnd or left floating: there is an external 2k pullup resistor to 5v and a second sink that can independently pull the line to gnd. My thought is thus that I could set the output value to 0 and enable or disable the output mask depending on whether I need a logic low or logic high.
Given that I will never be outputting logic-high to the pin, does that pin require a voltage-shifter?
Thanks!
Geoff
Statistics: Posted by gwinkless — Sat Sep 27, 2025 1:19 pm — Replies 0 — Views 52