Re: GPIO max current
Posted: Thu Nov 02, 2017 2:48 pm
Since we don't know, it would be nice to get an explanation, preferably from Gert (since he posted here). Are there any other SOCs out there which are *comparable* and have a proper documentation? By now it appears to me the 50mA are more a wild guess than a limit. Probably there are no factory tests and no (hard) predictions. Maybe the manufacturers are afraid that people would take static limits for dynamic signals. Maybe the 50mA are really documented by Broadcom, but as so many other documents, they don't disclose them. I don't know. Since I was curious, I ran a Pi-2 for a while with something about 150mA (static) on Bank0, without visible damage (I would have tried more but ran out of resistors). I might have got lucky, or not. Who can say. If I have time, I'm going to load *safely* all 28 pins step-by-step to 16mA, verify voltage drop and heat, and post my findings. Up to now I didn't encounter any application that would need this, just curious.