I just received my brand new and fresh Nova Global where the main modem is an Ublox SARA-R410 and I am planning to use the UART interface instead of USB to issue AT commands.
Reading a bit more on the https://hologram.io/docs/reference/nova/datasheet/ _
The USB_D+ / USB_D- lines carry the USB serial data and signaling. The USB interface is automatically enabled by an external valid USB VBUS supply voltage (5.0 V typical) applied on the VUSB_DET pin.
and also Ublox SARA-R410 datasheet I figured out USB VBUS probably is connected after the TPS63020DSJ regulator in some part of the 3.8V path. I could no enable the UART interface even removing the regulator from the board.
So my question are:
Is there available a schematic for this module? to just cut the USB VBUS track (only if it is possible)
Is there any information available regarding how to disable USB VBUS on this board?.
why have leave exposed the UART pads if they are not going to work? ( only if the 2 question above are negative)
PD: I soldered back the regulator to the board and it works like a charm