voltage - Why does USB have Vcc=5V and high=3.3V? - Electrical Engineering Stack Exchange
USB (Communications) - Wikipedia
USB charging without fear
To what voltage should the D+ line be pulled up when designing USB connection in STM32? +5V or +3.3V? All documentation and dev board scematics says it's 3.3V, but it didn't work.
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What is the exact voltage of a standard USB data signal in either data wire? I'd assume they are the same. I know that the power wires are 5 volts. - Quora
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USB charging without fear
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3.6 V zener diodes at D+ and D-are added to limit the voltage. | Download Scientific Diagram
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