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Commission welcomes new EU standards for common mobile phone charger". Press Releases. Europa. December 29, 2010. Archived from the original on March 19, 2011 . Retrieved May 22, 2011.
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The USB Device Working Group has laid out specifications for audio streaming, and specific standards have been developed and implemented for audio class uses, such as microphones, speakers, headsets, telephones, musical instruments, etc. The working group has published three versions of audio device specifications: [65] [66] USB Audio1.0, 2.0, and 3.0, referred to as "UAC" [67] or "ADC". [68]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
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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. The USB standard also provides multiple benefits for hardware manufacturers and software developers, specifically in the relative ease of implementation: 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 While converters exist between certain legacy interfaces and USB, they might not provide a full implementation of the legacy hardware. For example, a USB-to-parallel-port converter might work well with a printer, but not with a scanner that requires bidirectional use of the data pins. How fast can a fast-charging phone charge if a fast-charging phone can charge really fast?". CNet . Retrieved December 4, 2016.The D± signals used by low, full, and high speed are carried over a twisted pair (typically unshielded) to reduce noise and crosstalk. SuperSpeed uses separate transmit and receive differential pairs, which additionally require shielding (typically, shielded twisted pair but twinax is also mentioned by the specification). Thus, to support SuperSpeed data transmission, cables contain twice as many wires and are larger in diameter. [34]
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The initial versions of the USB standard specified connectors that were easy to use and that would have acceptable life spans; revisions of the standard added smaller connectors useful for compact portable devices. Higher-speed development of the USB standard gave rise to another family of connectors to permit additional data paths. All versions of USB specify cable properties; version 3. x cables include additional data paths. The 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 240 watts. USB has been selected as the standard charging format for many mobile phones, reducing the proliferation of proprietary chargers.
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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.
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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. Oppo Super VOOC Flash Charge, are also known as Dash Charge or Warp Charge on OnePlus devices and Dart Charge on Realme devices The chipset and drivers used to implement USB and FireWire have a crucial impact on how much of the bandwidth prescribed by the specification is achieved in the real world, along with compatibility with peripherals. [110] Ethernet [ edit ] 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.)The operation modes USB3.2Gen2×2 and USB4Gen2×2 – or: USB3.2Gen2×1 and USB4Gen2×1 – are not interchangeable or compatible; all participating controllers must operate with the same mode. Common Charging and Local Data Connectivity". Open Mobile Terminal Platform. February 11, 2009. Archived from the original on March 29, 2009 . Retrieved February 11, 2009. Some non-standard USB devices use the 5V power supply without participating in a proper USB network, which negotiates power draw with the host interface. Examples include USB-powered keyboard lights, fans, mug coolers and heaters, battery chargers, miniature vacuum cleaners, and even miniature lava lamps. In most cases, these items contain no digital circuitry, and thus are not standard-compliant USB devices. This may cause problems with some computers, such as drawing too much current and damaging circuitry. Prior to the USB Battery Charging Specification, the USB specification required that devices connect in a low-power mode (100mA maximum) and communicate their current requirements to the host, which then permits the device to switch into high-power mode. USB cables are limited in length, as the standard was intended for peripherals on the same table-top, not between rooms or buildings. However, a USB port can be connected to a gateway that accesses distant devices. 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.
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