Datasheet

Special Notes

The following pins have some restrictions that need to be taken into account when using them:

PIN_DFU / P0.20: If this pin is detected to be at GND level at startup, the board will enter a special serial

bootloader mode and will not execute any user code, going straight into bootloader mode. If you wish to use this

pin as a standard GPIO, make sure that it is pulled high with a pullup resistor so that your code will execute

normally when the MCU starts up.

P0.31 / A7: This pin is hard wired to a voltage-divider on the LIPO battery input, allow you to safely measure the

LIPO battery level on your device. If possible, you should avoid using this pin as an

input

because you will lose

the ability to read the battery voltage. You can use it as an

output

just make sure to switch the pin to analog input

when you want to do the battery read, then back to output when toggling pins

FRST/P0.22: Setting this pin to GND at startup will cause the device to perform a factory reset at startup, erasing

and config data as well as the user sketch. At the next reset, you should enter serial bootloader mode by default,

since no user sketch will be present. You can use this to recover 'bricked' boards, but if you don't wish to do this

be careful not to have FRST low at startup. By default, a weak internal pull-up resistor is enabled on this pin

Please note that the nRF52832 uses a USB serial adapter to RXD/TXD are with respect to the nRF52