topic Re: USB Power detect with MK64F in Kinetis Microcontrollers

USB Power detect with MK64F

loicguillain — Fri, 19 Jun 2015 07:45:31 GMT

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.

Re: USB Power detect with MK64F

danielecortella — Fri, 19 Jun 2015 08:13:28 GMT

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.

Re: USB Power detect with MK64F

loicguillain — Fri, 19 Jun 2015 08:35:48 GMT

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