RE: 3.7V battery connection to VBUS

Stian Røed Hafskjold — Mon, 19 Jul 2021 12:14:51 GMT

It should be fine applying 3.7V to the VBUS pin. There will flow some current in the 20 uA range (if I remember correctly) into the VBUS pin, so for low power designs it's recommended to not power VBUS unless the USB peripheral is in use.

Please have a look at the absolute ratings in the PS: https://infocenter.nordicsemi.com/topic/ps_nrf52840/abs_max_ratings.html?cp=4_0_0_8

	Min.	Max.	Unit
Supply voltages
VDD	-0.3	+3.9	V
VDDH	-0.3	+5.8	V
VBUS	-0.3	+5.8	V
VSS		0	V