Amazon Basics USB 2.0 A-Male to Micro B Cable For Smartphone, 6 feet, Black

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The USB Power Delivery specification revision3.0 defines an optional Programmable Power Supply (PPS) protocol that allows granular control over V BUS power, allowing a range of 3.3 to 21 V in 20mV steps to facilitate constant-current or constant-voltage charging. Revision 3.0 also adds extended configuration messages and fast role swap and deprecates the BFSK protocol. [57] [68] [69] The Certified USB Fast Charger logo for USB Type-C charging ports Universal Serial Bus 2.0 Specification, Section 7.2.1.4 High-power Bus-powered Functions" (ZIP). usb.org. 27 April 2000. Archived from the original on 10 September 2013 . Retrieved 11 January 2014.

Before the Battery Charging Specification was defined, there was no standardized way for the portable device to inquire how much current was available. For example, Apple's iPod and iPhone chargers indicate the available current by voltages on the D− and D+ lines. When D+ = D− = 2.0V, the device may pull up to 900mA. When D+ = 2.0V and D− = 2.8V, the device may pull up to 1A of current. [53] When D+ = 2.8V and D− = 2.0V, the device may pull up to 2A of current. [54] Accessory charging adapters (ACA) [ edit ] a b "Deprecation of the Mini-A and Mini-AB Connectors" (PDF) (Press release). USB Implementers Forum. 27 May 2007. Archived from the original (PDF) on 6 March 2009 . Retrieved 13 January 2009. USB ports and connectors are often color-coded to distinguish their different functions and USB versions. These colors are not part of the USB specification and can vary between manufacturers; for example, the USB3.0 specification mandates appropriate color-coding while it only recommends blue inserts for Standard-A USB3.0 connectors and plugs. [8] Connector types [ edit ] In 2008, USB-IF introduced USB 3.0, which ran at a speedy 5 Gbps, offering roughly a 10x improvement in throughput over the preceding USB 2.0. Even today, that’s the top speed that most devices support. In fact, most peripherals only need USB 2.0 speeds.USB PowerShare Feature". dell.com. 5 June 2013. Archived from the original on 8 November 2013 . Retrieved 4 December 2013. 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. The practical benefits of this include pass-through charging; effectively a USB hub that powers laptops, and also charges other devices simultaneously. Additionally, laptops can be powered by portable USB-C chargers, allowing greater flexibility when on the move. USB-C is relatively new, so there have been some issues. Some early users complained that the standard is trying to do too much for all devices; an inevitable risk of bringing a universal solution into a complicated ecosystem. Since USB-C is a standard, actual implementations may vary, and they may not support all modes of operation.

There are several minimum allowable voltages defined at different locations within a chain of connectors, hubs, and cables between an upstream host (providing the power) and a downstream device (consuming the power). To allow for voltage drops, the voltage at the host port, hub port, and device are specified to be at least 4.75V, 4.4V, and 4.35V respectively by USB2.0 for low-power devices, [a] but must be at least 4.75V at all locations for high-power [b] devices (however, high-power devices are required to operate as a low-powered device so that they may be detected and enumerated if connected to a low-power upstream port). The USB3. x specifications require that all devices must operate down to 4.00V at the device port. In addition to limiting the total average power used by the device, the USB specification limits the inrush current (i.e., the current used to charge decoupling and filter capacitors) when the device is first connected. Otherwise, connecting a device could cause problems with the host's internal power. USB devices are also required to automatically enter ultra low-power suspend mode when the USB host is suspended. Nevertheless, many USB host interfaces do not cut off the power supply to USB devices when they are suspended. [100]

In most modern technology devices, there will be some form of USB connection available to connect equipment. Despite supposedly being universal, there are different variations of USB types and versions; including what connectors and cables each can use.

If both connectors are USB Type-A, it would be a USB Type-A cable (or a USB male-to-male of cable or, simply, a USB cable). 2. AS ONE TYPE TO ANOTHER Universal Charging Solution ~ GSM World". GSM world. Archived from the original on June 26, 2010 . Retrieved June 22, 2010.

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chargers". EU: EC. 29 June 2009. Archived from the original on 23 October 2009 . Retrieved 22 June 2010. The different A and B plugs prevent accidentally connecting two power sources. However, some of this directed topology is lost with the advent of multi-purpose USB connections (such as USB On-The-Go in smartphones, and USB-powered Wi-Fi routers), which require A-to-A, B-to-B, and sometimes Y/splitter cables. See the USB On-The-Go connectors section below for a more detailed summary description. Universal Serial Bus 2.0 Specification, Section 7.2.1.3 Low-power Bus-powered Functions" (ZIP). usb.org. 27 April 2000. Archived from the original on 10 September 2013 . Retrieved 11 January 2014. a b c "Universal Serial Bus Micro-USB Cables and Connectors Specification" (PDF). USB Implementers Forum. April 4, 2007. Archived (PDF) from the original on November 15, 2015 . Retrieved January 31, 2015. The GSM Association (GSMA) followed suit on February 17, 2009, [88] [89] [90] [91] and on April 22, 2009, this was further endorsed by the CTIA – The Wireless Association, [92] with the International Telecommunication Union (ITU) announcing on October 22, 2009, that it had also embraced the Universal Charging Solution as its "energy-efficient one-charger-fits-all new mobile phone solution," and added: "Based on the Micro-USB interface, UCS chargers will also include a 4-star or higher efficiency rating—up to three times more energy-efficient than an unrated charger." [93] EU smartphone power supply standard [ edit ]