PORTS Forum

Ports and Interfaces => USB => Topic started by: meromeo on June 07, 2012, 11:59:52 am

Title: Charging devices from USB ports
Post by: meromeo on June 07, 2012, 11:59:52 am

There are many specitications on USB powered devices?.
That is: I´ve seen some chargers devoted to some particular devices (telephones, ipod, etc).
Aren´t the same requirements for charging?. If not, are regulated by any standard?.¡
Best regards.

Title: Re: Charging devices from USB ports
Post by: Jan Axelson on June 07, 2012, 12:08:10 pm

The USB battery charging spec is here:

http://www.usb.org/developers/devclass_docs

It's been through a few revisions, which might explain some incompatibility. Ideally any USB charger would work with any device.

Jan

Title: Re: Charging devices from USB ports
Post by: Barry Twycross on June 08, 2012, 01:33:16 pm

Also Apple invented their charging scheme before the USB-if came up with their charger spec. So iPod (and iPhone etc) chargers may be a different spec to other ones. Though later iPod and iPhone recognise USB-if chargers.