I have a Canon Powershot A520 digital camera and recently my AA batteries ran out (they don't last long). So to take a photo I hooked it up to a power supply

The camera says it requires a 3.15 Volt Power supply, but unfortunately the power supply I used was 5 Volts.

I got some new AA batteries but the camera still does not work.

It also has a CR2220 battery - does this need to be replaced for it to work or have I blown up the camera?

Cheers