There is no such thing as a "5V GPIO pin" !
The nominal output voltage of a GPIO pin is 3.3Volt!
Voltage drop of the power supply is mainly caused by the
cable between the PSU and the RPI, that is why the oficial PSU outputs 0.1Volt extra to compensate this (5.1 Volt).
The Regulator on the RPI creates the 3.3Volt that feeds the GPIO Drivers. The GPIO drivers are designed to try to keep the output voltage stable, dependant of the output current (15m max) see the schematic of the GPIO driver in the technical documentation.
If you actually MUST have a 5V GPIO, then add a level converter behind the GPIO pin!
The nominal output voltage of a GPIO pin is 3.3Volt!
Voltage drop of the power supply is mainly caused by the
cable between the PSU and the RPI, that is why the oficial PSU outputs 0.1Volt extra to compensate this (5.1 Volt).
The Regulator on the RPI creates the 3.3Volt that feeds the GPIO Drivers. The GPIO drivers are designed to try to keep the output voltage stable, dependant of the output current (15m max) see the schematic of the GPIO driver in the technical documentation.
If you actually MUST have a 5V GPIO, then add a level converter behind the GPIO pin!
Statistics: Posted by mahjongg — Fri Nov 28, 2025 8:03 pm