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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.
USB - Wikipedia USB - Wikipedia
Battery Charging Specification 1.1 Added support for dedicated chargers, host chargers behavior for devices with dead batteries Broad Manufacturer Agreement Gives Universal Phone Cable Green Light" (Press release). OTMP. September 17, 2007. Archived from the original on June 29, 2009 . Retrieved November 26, 2007. For a host providing power to devices, USB has a concept of the unit load. Any device may draw power of one unit, and devices may request more power in these discrete steps. It is not required that the host provide requested power, and a device may not draw more power than negotiated. UART and RS-232 serial adapter, modem, Wi-Fi adapter, Ethernet adapter. Used together with class 0Ah (CDC-Data) below
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The Universal Serial Bus was developed to simplify and improve the interface between personal computers and peripheral devices, such as cell phones, computer accessories, and monitors, when compared with previously existing standard or ad hoc proprietary interfaces. [12]
A Complete Guide to USB Connectors - RS Components
The PCI Express function of USB4 replicates the functionality of previous versions of the Thunderbolt specification. OMTP Local Connectivity: Data Connectivity". Open Mobile Terminal Platform. September 17, 2007. Archived from the original on October 15, 2008 . Retrieved February 11, 2009. There are so-called cables with A plugs on both ends, which may be valid if the "cable" includes, for example, a USB host-to-host transfer device with two ports. [3] This is, by definition, a device with two logical B ports, each with a captive cable, not a cable with two A ends.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. Hill, Simon; Revilla, Andre; Chandler, Simon (July 1, 2021). "How does fast charging work? Here's every single standard compared". Digital Trends . Retrieved August 20, 2022. Apple's Lightning to Micro-USB adapter now available in US, not just Europe anymore", Engadget, 3 November 2012, archived from the original on 26 June 2017 Battery Charging Specification, Revision 1.1". USB Implementers Forum. April 15, 2009. Archived from the original on March 29, 2014 . Retrieved September 23, 2009. 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.
USB cables and adaptors - Cheap USB cables and - Currys USB cables and adaptors - Cheap USB cables and - Currys
Smith, Ryan (September 22, 2014). "DisplayPort Alternate Mode for USB Type-C Announced - Video, Power, & Data All Over Type-C". AnandTech. Archived from the original on December 18, 2014 . Retrieved December 28, 2014. In July 2012, the USB Promoters Group announced the finalization of the USB Power Delivery ( USB-PD) specification (USB PD rev. 1), an extension that specifies using certified PD aware USB cables with standard USB Type-A and Type-B connectors to deliver increased power (more than 7.5W) to devices with greater power demands. (USB-PD A and B plugs have a mechanical mark while Micro plugs have a resistor or capacitor attached to the ID pin indicating the cable capability.) USB-PD Devices can request higher currents and supply voltages from compliant hosts—up to 2A at 5V (for a power consumption of up to 10W), and optionally up to 3A or 5A at either 12V (36W or 60W) or 20V (60W or 100W). [59] In all cases, both host-to-device and device-to-host configurations are supported. [60] The design is intended to make it difficult to insert a USB plug into its receptacle incorrectly. The USB specification requires that the cable plug and receptacle be marked so the user can recognize the proper orientation. [30] The USB-C plug however is reversible. USB cables and small USB devices are held in place by the gripping force from the receptacle, with no screws, clips, or thumb-turns as some connectors use.
For a product developer, using USB requires the implementation of a complex protocol and implies an "intelligent" controller in the peripheral device. Developers of USB devices intended for public sale generally must obtain a USB ID, which requires that they pay a fee to the USB Implementers Forum (USB-IF). Developers of products that use the USB specification must sign an agreement with the USB-IF. Use of the USB logos on the product requires annual fees and membership in the organization. [12] History [ edit ] The basic USB trident logo [15] USB logo on the head of a standard Type-A (Standard-A) plug High-speed (HS) uses the same wire pair, but with different electrical conventions. Lower signal voltages of −10 to 10 mV for low and 360 to 440 mV for logical high level, and termination of 45Ω to ground or 90Ω differential to match the data cable impedance. USB takes full advantage of the additional processing power that can be economically put into peripheral devices so that they can manage themselves. As such, USB devices often do not have user-adjustable interface settings.
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