Hi, I want to use a Raspberry Pi Pico H (SC0917) for an application to drive some external devices. The Pico is powered by USB and the devices are powered by an external PSU (12V DC).
As soon as ground from the PSU is connected to ground from the Pico while the pico is running and connected through USB (for testing purposes I've disconnected all other pins from the Pico), the USB connection goes offline for a short amount of time and on again afterwards. I suspect this is due to transient voltage from building the common ground between USB and the PSU. The Pico does not reboot, it's just the USB connection which is seemingly reset.
Is this known/expected behavior and what are measures to prevent this reset of the USB connection?
Many thanks, any hints appreciated.
As soon as ground from the PSU is connected to ground from the Pico while the pico is running and connected through USB (for testing purposes I've disconnected all other pins from the Pico), the USB connection goes offline for a short amount of time and on again afterwards. I suspect this is due to transient voltage from building the common ground between USB and the PSU. The Pico does not reboot, it's just the USB connection which is seemingly reset.
Is this known/expected behavior and what are measures to prevent this reset of the USB connection?
Many thanks, any hints appreciated.
Statistics: Posted by winxi — Sun May 25, 2025 8:32 pm — Replies 1 — Views 36