Hi there,
I am designing my own board and had some design questions about the Adafruit Feather MO.
Please see the schematic: https://cdn-learn.adafruit.com/assets/assets/000/028/801/original/adafruit_products_M0SCHEM.png?1448656357
If a USB is plugged in and VBUS is equal to 5V but no battery is plugged in at VBAT. What would be the value of the VBAT pin?
Thanks,
D
As I read the datasheet of the MCP73831 it would be at 4.2v (the termination point for the CV charging mode); note that this doesn't matter unless you're using VBat directly, since the 3.3v regulator is fed from VBus if it's connected to USB (they put a schottky diode from VBat to the input of the regulator, and connect it directly to VBus).
Hi, thanks for the information.
This is important as I only plan to power the board using VBAT not using the USB at all. Can I do this still if I do not want to do the diode?
Thanks
