The simple way to tell is to have a look at the board. The Zero uses a PAM2306 regulator for 3.3V and 1.8V supplies. Theoretical maximum output current according to the datasheet is 1A per output.julyjim wrote: ↑Sun Apr 22, 2018 12:40 amI do not want to start another debate about the subject , however
the unofficial schematic for RPi 3b clearly identifies distribution of 3,3 V from 5 V - via 3.3 regulator.
The question or speculation remains - how does Zero gets 3.3V output?
Yes, I am planning to use 3.3v whenever possible.
And all other Pi models too.
No, it does not. The soc "high" level for the gpio is 3v3 on all Pi models. It does not output 5v on GPIO, the GPIO *header* has a couple of pins attached to the 5v net, which just comes from the positive lead of the power connector.The "processor" runs on 1.8 V - so how does it manage to put 5V on GPIO ?
No, the gpio pins use levels of approximately 3v3 and 0v. They aren't 5v tolerant.Perhaps one has to make sure the I/O devices can function with 1.8V logic.
This is a well known fact. The layout of the 40 pin header is standard across the Raspberry Pi range (other than the early models with 26 pin headers and the CM modules).
It doesn't. The GPIOs run at 3.3V. The 1.8V is for signals inside the chip only. The pins marked 5V are direct 5V feeds from the power input.The "processor" runs on 1.8 V - so how does it manage to put 5V on GPIO ?
No. They have to use 3.3V logic.Perhaps one has to make sure the I/O devices can function with 1.8V logic.