CoAx Power Adaptor


I've planning on wiring the CoAx power connector [1], through to a power controller chip, and then on to my Raspberry Pi with Amp2 HAT.

I have two questions:

1. Is there a spec sheet for the CoAx power connector? I assume the long leg is +, but I didn't get anything with it.

2. For the power controller, I'd like to wire up a STSP switch to turn on the main Pi and Amp2 board. The Switch at the moment is connected to an Arduino Uno that is handling all the analog & digital inputs. Can I use the I2C on the Uno to turn on or off the power controller to the Pi, rather than the Pi itself? 








[1] https://www.hifiberry.com/shop/accessories/coaxial-power-connector-5-5x2-1mm/


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