USB Power detect with MK64F

[loicguillain]

I'm using a function to charge a battery and supply the MK64F when it's usb supplied and use this battery to suuply the microcontroller when it's not usb supplied. I would like to know how i can do to indicates which entry it has to his power supply port (to authorize sleep mode or not).

I tought to use a voltage divider connected between +5v of my USB and a GPIO (in input) and generate interrupt. Could I get your advice?

Thanks to you.

[danielecortella · Accepted solution]

Hi,

Normaly the USB charger have a PGOOD pin that indicate when an external power is connected but in your case you don't have, so yes you can use a voltage divider using two resistors.

[loicguillain]

Thanks to you for your fast answer :smileywink: and your help.