Heltec CubeCell - part 2

[Paul_Stewart]

Heltec CubeCell - part 1

I’m trying to understand the missing pieces of the ‘Power management system’ part in the HTCC-AB01 diagram to find out how to properly connect power to the board (and how not) in order not to damage it. There are Vusb, Vin, Vs(olar), VDD and Vext and their relation and what can and cannot be connected at the same time does not become clear from the circuit diagram (because parts are missing). E.g. is it safe to connect USB and Vin at the same time?, is it safe to connect USB and a solar panel a…

The diagram shows that:

• Vin is directly connected (via fuse) to USB power. The board should therefore be powered either via USB or via Vin but NEVER both.