Datasheet

Pinouts

Power Pins

The ItsyBitsy nRF52840 Express has BAT G USB on the

top left, next to the micro USB port

These pins are:

BAT - battery

input

for an alternative power source

to USB, the voltage can only be from 3.5V to

6VDC

GND - Power/data ground

USB - This is the same pin as the MicroUSB

connector's 5V USB power pin. This should be

used as an

output

to get 5V power from the USB

port. Say if you need to power a bunch of

NeoPixels or servos.

You can always put any voltage you like into BAT and the circuitry will switch between BAT and USB dynamically for

you. That means you can have a Battery backup that only gets enabled when USB is disconnected.

If you want to add rechargeable power, a LiPoly backpack can be soldered into these three pins that will let you have a

battery that is

automatically recharged

whenever USB is plugged in, then switches to LiPoly when on the go: