Hello, we bought Cube with original carrier board for development purposes, and we are into developing one that fits our needs right now. However we ran into some issues:
Cube in ORIGINAL CB, after plugging USB into it blinks green and then only red/orange with some pulsing. A new device in windows manager appears, however we are unable to open com port to communicate with it.
On custom CB, Cube is being dead solid green with no pulsing whatsoever. I raised slightly VCC 5V (63, 65 pin of cube) (from around 4,88V to above 5V) and orange LED (one) started to blink (all the time). After connecting USB to cube, no device appears in windows manager.
For the cube connector, we only applied power to the main pins (65, 63) and the GND of course. We started to dig into schematic of original CB, we were trying to pull down brick_valid, power VUSB, or play with VUSB_valid but this results in no change in Cube behaviour whatsoever.
Replugiing cube into the original CB gives same result as in pt. 1 so we dont think we could damage it anyhow.
My question is - what we are missing in both cases? Why on custom CB powered cube behaves differently than on original carrier board, if USB is plugged directly into the cube?