In the documentation, it says that VUSB can be used as "Power in with limitations." But I haven't found anywhere that lists out the limitations. For normal breadboard prototyping, is it safe to feed 5V into VUSB?
5V is safe.
The limitations are in comparison to the Boron. The Boron has a much wider input range, up to 17V, but the limit is close to 5V on the Photon 2.
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