"cold" plugging usb?

The official pyboard running MicroPython.
This is the reference design and main target board for MicroPython.
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Joined: Tue Jan 22, 2019 2:16 am
Location: Kirkland, WA, USA

"cold" plugging usb?

Post by smhodge » Sat Feb 13, 2021 4:58 pm

My pyboards (v1.1) are powered externally via V+. I know from experience it is ok to hot plug/unplug the USB connection while the board is powered on (or at least I haven't had any issues in over 100's of times). However, some time ago I had an issue that made me suspect "cold" plugging it, i.e., having it plugged in when V+ is turned on, was not a good idea, so I haven't done it since...at least not if I remember. But occassionally I have forgotten and it seems to survive ok.

So I thought I'd pose the question to those that have more knowledge of the inner workings of the board. Is is ok to have USB plugged in before applying external power?

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