P19 (Debug OUT Connector) on the nRF52840 BLE RF Development Board, PCA10056 (Dev Board) provides the ability to program a nRF52840 BLE board (BLE Board).
Questions:
1. Is SB47 open or shorted by default?
2. Does EXT_VTG provide the means to detect if SB47 is shorted?
3. There are no I/O buffers for the signals on P19 on the Dev Board. If SB47 is open and the battery is not plugged in on the BLE Board or if the battery has run down to < 2.9V, can signals on P19 from the Dev Board destroy the nRF52840 on the BLE Board (the signal levels on the BLE Board would be above VCC+0.3V).
