Joined in 2023 
82 
63 About this deal
Nice Micro-USB adapter Apple, now sell it everywhere", Giga om, 5 October 2011, archived from the original on 26 August 2012 Battery Charging Specification, Revision 1.1". USB Implementers Forum. April 15, 2009. Archived from the original on March 29, 2014 . Retrieved September 23, 2009. 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
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. USB device communication is based on pipes (logical channels). A pipe is a connection from the host controller to a logical entity within a device, called an endpoint. Because pipes correspond to endpoints, the terms are sometimes used interchangeably. Each USB device can have up to 32 endpoints (16 in and 16 out), though it is rare to have so many. Endpoints are defined and numbered by the device during initialization (the period after physical connection called "enumeration") and so are relatively permanent, whereas pipes may be opened and closed.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.
High-power devices in USB 2.0 are those draw more than one unit load (up to a maximum of 5 unit loads). 1 unit load is 100mA. 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] 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 ]Low-power and high-power devices remain operational with this standard, but devices using SuperSpeed can take advantage of increased available current of between 150mA and 900mA, respectively. [30] :9–9 a b c d e "Universal Serial Bus Cables and Connectors Class Document Revision 2.0" (PDF). USB.org. August 2007. Archived from the original (PDF) on June 11, 2014 . Retrieved April 28, 2019. The following 10 biggest mobile phone companies have signed the MoU: Apple, LG, Motorola, NEC, Nokia, Qualcomm, Research In Motion, Samsung, Sony Ericsson, Texas Instruments (press release), Europa, archived from the original on July 4, 2009 The host controller directs traffic flow to devices, so no USB device can transfer any data on the bus without an explicit request from the host controller. In USB2.0, the host controller polls the bus for traffic, usually in a round-robin fashion. The throughput of each USB port is determined by the slower speed of either the USB port or the USB device connected to the port.
Great Deal 
New Comment