klricks wrote: ↑
Fri Oct 06, 2017 5:14 pm
gordon77 wrote: ↑
Fri Oct 06, 2017 2:56 pm
Is " The raspberry-Pi 3V3 supply was designed with a maximum current of ~3mA per GPIO pin. If you load each pin with 16mA the total current is 272mA. The 3V3supply will collapse under that " still True on the latest Pi's? Hasn't a larger regulator been added?
There is a larger PS but from what I understand the SOC / GPIO has not changed. There is still a max spec of 50mA across ALL GPIO's combined. So if you want to draw the Max 16mA then only 3 GPIOs could be used. 3*16=48mA. All others must be 0 in that case or else you risk damaging the RPi.
It would be good to get an official view on this 50mA limit, and does it still exist
This site https://raspberrypi.stackexchange.com/q ... imitations
Says "The Pi 3.3V rail is widely claimed to provide 50mA, and each pin 3mA. Gert van Loo explained that these were design values; the circuitry was designed so each of the 17 pins could supply ~3mA, ~51mA in total. This applies to the original Pi A & B; the B+ and later (with 40 pin header), including the Pi Zero, have no such limit."