nRF52 and 9V Battery

[Levi]

Hello,

I am trying to design a power supply circuit for my project based around the nRF52 and various sensors. I need to use the 5V pin so I will need a bigger battery than the CR2032.

I was thinking about connecting a 9V battery directly to the micro-USB port on the nRF52 using a custom-made cable. I don't want to fry my board, so I was wondering if the voltage regulator on the nRF52 would be able to handle 9V?

I am hoping the 9V will be able to power 3 TWI sensors and perform BLE tasks on the nRF52.

Any help or suggestions would be greatly appreciated!

Thanks!

[butch]

Do you mean the NRF52DK dev board? And the 5V pin that is to an Arduino shield? I don't know of any documentation about the voltage regulator, but the schematic is available. As an alternative, can you use 3 1.5V AAA and connect to P21, external power? Then you wouldn't need to worry as much, since I think the 4.8V would be close to USB voltage level. But check the schematic, for where P21 supplies power. Maybe there is better documentation for P21 than for the USB port.