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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. Technical Introduction of the New USB Type-C Connector". Archived from the original on December 29, 2014 . Retrieved December 29, 2014.
USB3.0 provides two additional differential pairs (four wires, SSTx+, SSTx−, SSRx+ and SSRx−), providing full-duplex data transfers at SuperSpeed, which makes it similar to Serial ATA or single-lane PCI Express. 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. The charging device identifies a charging port by non-data signaling on the D+ and D− terminals. A dedicated charging port places a resistance not exceeding 200Ω across the D+ and D− terminals. [50] :§ 1.4.7; table 5-3 Revision 1.2 of the specification was released in 2010. It made several changes, and increased limits including allowing 1.5A on charging downstream ports for unconfigured devices—allowing High Speed communication while having a current up to 1.5A. Also, support was removed for charging port detection via resistive mechanisms. [52] 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.
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The Micro plug design is rated for at least 10,000 connect-disconnect cycles, which is more than the Mini plug design. [13] [16] The Micro connector is also designed to reduce the mechanical wear on the device; instead, the easier-to-replace cable is designed to bear the mechanical wear of connection and disconnection. The Universal Serial Bus Micro-USB Cables and Connectors Specification details the mechanical characteristics of Micro-A plugs, Micro-AB receptacles (which accept both Micro-A and Micro-B plugs), Double-Sided Micro USB, and Micro-B plugs and receptacles, [16] along with a Standard-A receptacle to a Micro-A plug adapter. 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.
By design, it is 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. [1] 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 other connectors use. 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] 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. Micro-USB was endorsed as the standard connector for data and power on mobile devices by the cellular phone carrier group Open Mobile Terminal Platform (OMTP) in 2007. [17] chargers". EU: EC. 29 June 2009. Archived from the original on 23 October 2009 . Retrieved 22 June 2010.
Part 2 - Electrical". MQP Electronics. Archived from the original on December 24, 2014 . Retrieved December 29, 2014. Worst-case voltage drop topology of a USB 3. x host to device chain, at steady state. Note that under transient conditions the supply at the device can momentarily drop from 4.0V to 3.67V. Allowable current draw [ edit ] USB power standards 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. One size-fits-all mobile phone charger: IEC publishes first globally relevant standard". International Electrotechnical Commission. February 1, 2011. Archived from the original on January 3, 2012 . Retrieved February 20, 2012. The USB1.1 standard specifies that a standard cable can have a maximum length of 5 meters (16ft 5in) with devices operating at full speed (12Mbit/s), and a maximum length of 3 meters (9ft 10in) with devices operating at low speed (1.5Mbit/s). [35] [36] [37]
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