20 Facts About Micro USB

Higher-speed development of the Micro USB standard gave rise to another family of connectors to permit additional data paths.

The Micro USB standard included power supply to peripheral devices; modern versions of the standard extend the power delivery limits for battery charging and devices requiring up to 100 watts.

Micro USB has been selected as the standard charging format for many mobile phones, reducing the proliferation of proprietary chargers.

Three sizes of USB connectors are the default or standard format intended for desktop or portable equipment, the mini intended for mobile equipment, which was deprecated when it was replaced by the thinner micro size, all of which were deprecated with the release of Type-C.

Micro USB devices have some choice of implemented modes, and Micro USB version is not a reliable statement of implemented modes.

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Unlike other data buses, Micro USB connections are directed; a host device has "downstream" facing ports that connect to the "upstream" facing ports of devices.

Connectors the Micro USB committee specifies support a number of Micro USB's underlying goals, and reflect lessons learned from the many connectors the computer industry has used.

The Micro USB specification requires that the cable plug and receptacle be marked so the user can recognize the proper orientation.

Standard USB has a minimum rated lifetime of 1,500 cycles of insertion and removal, the mini-USB receptacle increases this to 5,000 cycles, and the newer Micro-USB and USB-C receptacles are both designed for a minimum rated lifetime of 10,000 cycles of insertion and removal.

Micro USB standard specifies tolerances for compliant Micro USB connectors to minimize physical incompatibilities in connectors from different vendors.

The Micro USB specification defines limits to the size of a connecting device in the area around its plug, so that adjacent ports are not blocked.

Mini-B connectors are still supported, but are not On-The-Go-compliant; the Mini-B Micro USB connector was standard for transferring data to and from the early smartphones and PDAs.

The Micro USB connector is designed to reduce the mechanical wear on the device; instead, the easier-to-replace cable is designed to bear the mechanical wear of connection and disconnection.

Micro USB cables exist with various combinations of plugs on each end of the cable, as displayed below in the Micro USB cables matrix.

Micro USB On-The-Go introduces the concept of a device performing both master and slave roles.

Intent is to permit uniformly charging laptops, tablets, Micro USB-powered disks and similarly higher-power consumer electronics, as a natural extension of existing European and Chinese mobile telephone charging standards.

On Dell, HP and Toshiba laptops, sleep-and-charge Micro USB ports are marked with the standard Micro USB symbol with an added lightning bolt or battery icon on the right side.

Some Micro USB devices require more power than is permitted by the specifications for a single port.

Micro USB devices are required to automatically enter ultra low-power suspend mode when the Micro USB host is suspended.

Examples include Micro USB-powered keyboard lights, fans, mug coolers and heaters, battery chargers, miniature vacuum cleaners, and even miniature lava lamps.