Could someone explain how to power the nRF52840 via USB?
Looking at the schematics, and also reading the "objective" spec, I can see that VBUS is connected to the USB input bus voltage, and this voltage seems to be used for some of the internal functions of the nRF52840, via an internal regulator
But as far as I can tell, the internal regulator doesn't seem to supply the whole nRF52840, and an external regulator is needed for the VDD and VDDH
So, its the minimal USB configuration, VBUS connected to USB 5V, VDDH connected to VBUS and VDD supplied via a 3.3V regulator from VBUS ?
Or is VDD not required if power is supplied via VDDH ? As I was under the impression that the nRF52840 could run from LiPo etc without the need for an external regulator, but LiPo cells can be around 4.2V at top of charge, which exceeds the voltage in the spec for VDD
Can anyone clarify this for me?
