This power handling ability has led to the use of USB 3.0 connections in several new schemes.
For example, one called Quick Charge is expected to make heavy use of USB Type C connectors.
But until obsolescence comes, designers must be able to differentiate one USB style from another.
First a few basics about connection speed: USB connections in the 1990s provided two speeds, 12 and 1.5 Mbps.
Developed by Qualcomm, it aims to charge batteries in a way that is more energy efficient than ordinary trickle-charge setups. “It is difficult for suppliers of USB connectors to differentiate themselves,” says CUI Inc. “One way we compete is by providing a broader range of mounting options, including a water-proof version we have in the works.” However, one differentiating feature that USB specifiers should indeed watch out for are connector markings that indicate certification, says Carroll.
Set up by the USB Implementers Forum, a compliance program uses a test regime at third-party testing organizations that is designed to signify a certain level of quality.
Standard USB B devices can connect to USB 2.0 hosts through a USB 2.0 A-to-B cable, which is compatible with USB 3.0 B ports.
Powered USB devices, though, have a non-removable, hard-wired cable.
The USB 2.0 specification in 2000 provided a third transfer rate of 480 Mbps.
The USB 3.0 standard released a few years ago moved data rates up to 450 MB/sec while retaining backward compatibility with USB 2.0.