PaulS
Well-known member
The pads must be separated if you want to power the Teensy externally and connect the USB cable for uploading/serial communication at the same time.
If the pads are connected, the external power supply will power the USB bus of the PC [or the other way around] - that's a no-go, it will most probably cause damage.
Paul
If the pads are connected, the external power supply will power the USB bus of the PC [or the other way around] - that's a no-go, it will most probably cause damage.
Paul