As my understanding, ST890 used for isolate USB 5V and Battery 5V( DC/DC from 10V by U12: LDFPVR ). And also provide 5V for ESC board in debug program even without battery connected.
But why when I use battery only, which means no usb pluged, there is still 5V in stlink board. (D3 led is lighted.)
SEEMS st890dtr transfer output voltage 5V to input side. (U5V) IS THAT A ISSUE?
