Is there any safe injected current to I/O pins of Raspberry Pi?
I want my Raspberry Pi (Zero 2W) to monitor a device with its own power supply via Serial interface. If the power supply of RPi fails for some reason the monitored device will try to pull its Tx line to 3V3 injecting current into the RPi input. I can simply limit this current by a series resistor - but what value to use to make it safe? Is 10k (~ 300uA) good enough?
I want my Raspberry Pi (Zero 2W) to monitor a device with its own power supply via Serial interface. If the power supply of RPi fails for some reason the monitored device will try to pull its Tx line to 3V3 injecting current into the RPi input. I can simply limit this current by a series resistor - but what value to use to make it safe? Is 10k (~ 300uA) good enough?
Statistics: Posted by Smajdalf — Tue Mar 26, 2024 8:01 am — Replies 0 — Views 1