Hello!
I have googled, searched the Arduino documentation and this forum, but no luck yet.
What is the maximum current that one can draw from the 5V pin?
If powered via USB, how much is left, taking into account the power draw from the MCU? I am also not sure about the USB-C standard. The old USB 2.0 was always 400-500mA.
If powered via barrel jack, how much mA can the pin deliver on a constant basis?
What is it that you are hoping to power from the 5V pin, bearing in mind that the board is not designed to be used as a power supply beyond powering low power sensors
If in any doubt then use an external power supply to be safe
Hello there, I'm also curious about this power specification. The datasheet shows VUSB connecting to all circuits after passing through D3 (Schottky). However, the same document states all power inputs connect to ISL854102FRZ-T:
The thing is, the buck converter ISL854102FRZ-T can go up to 1.2[A], but VUSB should go as high as 3.0[A] (USB Type-C).
Does anybody have experimented with this limit? Thanks!
Vin is the power supply in most boards.
I didn't find a definitive answer either, but I did find that it depends on the supply voltage:
Power supply hot - UNO R4 / UNO R4 Minima - Arduino Forum
Brian
This explains all
https://docs.arduino.cc/tutorials/uno-r4-minima/cheat-sheet/
The actual answer to the question is 1.2 A if powering the board from VIN (barrel jack) and 2 A if powering through the USB connection.
Thank you @jim-p for providing the relevant link.
Note that the 1.2 A value includes "the rest of the circuit board", so keep your power draw under 1150 mA to be safe. Also, the ability to get the full 2 A from the USB connection ultimately depends on your USB source (but the board will allow up to 2 A to pass though without damage).
As a side note, I'm sick and tired of people answering a perfectly valid question with "why are you doing that?", or "here's another bit of information that in no way answers the question." If you don't have the answer to the OP's question then please remain silent. (Rant over). Thanks.
It is not uncommon for a user to decide that they have a particular problem and to hit upon a possible solution to it. Then they ask for help with their solution, often not actually saying what the original problem was
As a result, experienced users here often ask for supplementary information or suggest alternatives that may not be applicable due to lack of information
This is a free forum to make (even stupid) questions or opinions, not a helpdesk.
I agree that in ideal world OP is presenting perfectly described problem and receiving complete solution from first reply....
When powered via the VIN pin, you are using the onboard regulator to bring down the voltage to 5V, which means that the 5 V pin can provide up to 1.2 A. Keep in mind that this voltage regulator also powers the rest of the circuit board, including the MCU, LEDs among other components.
What you can or should expect to get from '5V' depends a lot on what you have going on on the Minima.
As I see it, it has more potential than a standard Uno.
We also have from the cheat sheet:
When powered via USB, you are bypassing the onboard voltage regulator completely. In this case, the 5 V pin can provide up to 2 A without damaging the board.
Which looks like a contradiction to the datasheet. Anyway, I tried pulsed currents and could reach 2.4[A] by using the USB, and the Arduino board worked completely fine.
It seems all @szapo questions were resolved!