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. On-The-Go and Embedded Host Supplement to the USB Revision 3.0 Specification" (PDF). USB.org. Revision 1.1. May 10, 2012. Portable devices having a USB On-The-Go port may want to charge and access a USB peripheral simultaneously, yet having only a single port (both due to On-The-Go and space requirement) prevents this. Accessory charging adapters (ACA) are devices that provide portable charging power to an On-The-Go connection between host and peripheral. The standard connectors were designed to be more robust than many past connectors. This is because USB is hot-swappable, and the connectors would be used more frequently, and perhaps with less care, than previous connectors.

Micro-USB was embraced as the "Universal Charging Solution" by the International Telecommunication Union (ITU) in October 2009. [18] As of 14June2007 [update], all new mobile phones applying for a license in China are required to use a USB port as a power port for battery charging. [83] [84] This was the first standard to use the convention of shorting D+ and D− in the charger. [85] OMTP/GSMA Universal Charging Solution [ edit ] Universal Serial Bus Revision 3.0 Specification, Sections 3.1.1.1 and 5.3.1.3". Usb.org. Archived from the original (ZIP) on 19 May 2014 . Retrieved 28 April 2019. What Is the USB 3.0 Cable Difference". Hantat. May 18, 2009. Archived from the original on December 11, 2011 . Retrieved December 12, 2011. It's important to note that USB cables can have different versions, such as USB 2.0, USB 3.0, USB 3.1, and USB 3.2, which determine their maximum data transfer speeds. The USB cable you need will depend on the specific devices you want to connect or charge. Where are USB cables used?a b Howse, Brett (August 12, 2014). "USB Type-C Connector Specifications Finalized". Archived from the original on December 28, 2014 . Retrieved December 28, 2014. 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] USB Type-C Revision 1.0" (PDF). USB 3.0 Promoter Group. March 1, 2021. Archived (PDF) from the original on November 3, 2021 . Retrieved November 3, 2021.

USB On-The-Go (OTG) introduces the concept of a device performing both host and device roles. All current OTG devices are required to have one, and only one, USB connector: a Micro-AB receptacle. (In the past, before the development of Micro-USB, On-The-Go devices used Mini-AB receptacles.)On January 8, 2018, USB-IF announced "Certified USB Fast Charger" logo for chargers that use "Programmable Power Supply" (PPS) protocol from the USB Power Delivery 3.0 specification. [70] Unlike other data buses (such as Ethernet), USB connections are directed; a host device has "downstream" facing ports that connect to the "upstream" facing ports of devices. Only downstream facing ports provide power; this topology was chosen to easily prevent electrical overloads and damaged equipment. Thus, USB cables have different ends: A and B, with different physical connectors for each. Each format has a plug and receptacle defined for each of the A and B ends. A USB cable, by definition, has a plug on each end—one A (or C) and one B (or C)—and the corresponding receptacle is usually on a computer or electronic device. The mini and micro formats may connect to an AB receptacle, which accepts either an A or a B plug, that plug determining the behavior of the receptacle. The Chinese technical standard: "YD/T 1591-2006, Technical Requirements and Test Method of Charger and Interface for Mobile Telecommunication Terminal Equipment" (PDF). Dian yuan (in Chinese). Archived from the original (PDF) on 15 May 2011. a b "10 Power Rules", Universal Serial Bus Power Delivery Specification revision2.0, version1.2, USB Implementers Forum, 25 March 2016, archived from the original on 1 June 2012 , retrieved 9 April 2016 a b "Minty Boost — The mysteries of Apple device charging". Lady Ada. 17 May 2011. Archived from the original on 28 March 2012.

ID Pin Resistance on Mini B-plugs and Micro B-plugs Increased to 1 Mohm". USB IF Compliance Updates. December 2009. Archived from the original on 20 July 2011 . Retrieved 1 March 2010. a b c "USB Power Delivery Specifications 2.0 and 3.1" (PDF (Zipped)). USB.org. October 26, 2021. Archived (PDF (Zipped)) from the original on November 3, 2021 . Retrieved November 3, 2021.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 Main article: USB-C The USB-C plug USB cable with a USB-C plug and a USB-C port on a notebook computer

How to configure the system to charge devices over USB port when it is off - idea/Lenovo laptops - NL". support.lenovo.com . Retrieved April 7, 2020. USB Power Delivery" (PDF). usb.org. USB-IF. October 20, 2016. Archived from the original (PDF) on December 20, 2016. How fast can a fast-charging phone charge if a fast-charging phone can charge really fast?". CNet . Retrieved December 4, 2016.

The OTG device with the A-plug inserted is called the A-device and is responsible for powering the USB interface when required, and by default assumes the role of host. The OTG device with the B-plug inserted is called the B-device and by default assumes the role of peripheral. An OTG device with no plug inserted defaults to acting as a B-device. If an application on the B-device requires the role of host, then the Host Negotiation Protocol (HNP) is used to temporarily transfer the host role to the B-device. a b "USB 2.0 Specification Engineering Change Notice (ECN) #1: Mini-B connector" (PDF). October 20, 2000. Archived from the original (PDF) on April 12, 2015 . Retrieved April 28, 2019– via www.usb.org.