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Axelson, Jan. "USB 3.0 Developers FAQ". Archived from the original on December 20, 2016 . Retrieved October 20, 2016. Universal Serial Bus Type-C Cable and Connector Specification, Release 2.2. USB Implementers Forum (Technical report). USB 3.0 Promoter Group. October 2022 . Retrieved April 12, 2023. USB-C is a forward-looking technology. It includes support for developing communication protocols that don’t exist yet, so there is room for progress. USB-C, USB-B, and USB-A differences may seem confusing, but USB-C is a huge improvement on two decades of confusion and looks set to clarify things for the future. The limit to device power draw is stated in terms of a unit load which is 100mA for USB 2.0, or 150mA for SuperSpeed (i.e. USB 3. x) devices. Low-power devices may draw at most 1 unit load, and all devices must act as low-power devices before they are configured. A high-powered device must be configured, after which it may draw up to 5 unit loads (500mA), or 6 unit loads (900mA) for SuperSpeed devices, as specified in its configuration because the maximum power may not always be available from the upstream port. [43] [44] [45] [46]
If you are interested in USB chargers for your office but are unsure of your choices, read our guide on how to choose a USB charger here. What are the different types of USB ports? Since these currents are larger than in the original standard, the extra voltage drop in the cable reduces noise margins, causing problems with High Speed signaling. Battery Charging Specification 1.1 specifies that charging devices must dynamically limit bus power current draw during High Speed signaling; [51] 1.2 specifies that charging devices and ports must be designed to tolerate the higher ground voltage difference in High Speed signaling. Connector properties [ edit ] Non-standard "USB extension cable", plug on the left, receptacle on the right. (USB does not allow extension cables. Non-standard cables may work but cannot be presumed reliable.) In June 2009, the European Commission organized a voluntary Memorandum of Understanding (MoU) to adopt micro-USB as a common standard for charging smartphones marketed in the European Union. The specification was called the common external power supply. The MoU lasted until 2014. The common EPS specification (EN 62684:2010) references the USB Battery Charging Specification and is similar to the GSMA/OMTP and Chinese charging solutions. [94] [95] In January 2011, the International Electrotechnical Commission (IEC) released its version of the (EU's) common EPS standard as IEC 62684:2011. [96]Another cool thing about Type C is that it offers a bi-directional power supply; in other words, you can charge your smartphone from your laptop and vice versa.
In September 2007, the Open Mobile Terminal Platform group (a forum of mobile network operators and manufacturers such as Nokia, Samsung, Motorola, Sony Ericsson, and LG) announced that its members had agreed on Micro-USB as the future common connector for mobile devices. [86] [87]Universal phone charger standard approved—One-size-fits-all solution will dramatically cut waste and GHG emissions". ITU (press release). Pressinfo. 22 October 2009. Archived from the original on 5 November 2009 . Retrieved 4 November 2009. The maximum allowed cross-section of the overmold boot (which is part of the connector used for its handling) is 16 by 8mm (0.63 by 0.31in) for the Standard-A plug type, while for the Type-B it is 11.5 by 10.5mm (0.45 by 0.41in). [2] Mini connectors [ edit ] Mini-A (left) and Mini-B (right) plugs
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