Interface
USB
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History

USB

Catalogue
  1. 1. Universal Serial Bus
    1. 1.1. USB 3.1 Gen2
  2. 2. Connectors
  3. 3. Power
    1. 3.1. USB power standards
    2. 3.2. Power-related specifications
  4. 4. 参考资料

Universal Serial Bus

Revision Data rate Speed Coding Actual Speed Max. Cable Length Release
USB 1.0 1.5 Mbps
12 Mbit/s		 192 KB/s 8b/10b 1996
USB 1.1 12 Mbit/s 1536 KB/s 8b/10b 5 M 1998
USB 2.0 480 Mbit/s 60 MB/s 8b/10b 48 MB/s 5 M 2001
USB 3.0
USB 3.1 Gen 1
USB 3.2 Gen1		 5 Gbit/s 625MB/s 8b/10b 500 MB/s 5 M 2011
USB 3.1 Gen 2
USB 3.2 Gen 2		 10 Gbit/s 1250 MB/s 128b/132b ~ 1212 MB/s 2014
USB 3.2
USB 3.2 Gen 2 x 2		 20 Gbit/s 2560 MB/s 2017
USB 4 40 Gbit/s 5120 MB/s 2019

USB 3.1 Gen2

  • Encode scheme: 128b/132b, line encode overhead: 3% ;
  • If Support USB Power Delivery 1.0/2.0, Max power: 20 V x 5 A = 100 W ;
  • Add Type-C connector;

Connectors

1547451006618

USB connectors

Power

USB power standards

Specification Current Voltage Power (max.)
Low-power device 100 mA 5 V[a] 0.50 W
Low-power SuperSpeed (USB 3.0) device 150 mA 5 V[a] 0.75 W
High-power device 500 mA[b] 5 V 2.5 W
High-power SuperSpeed (USB 3.0) device 900 mA[c] 5 V 4.5 W
Multi-lane SuperSpeed (USB 3.2 Gen 2) device 1.5 A[d] 5 V 7.5 W
Battery Charging (BC) 1.2 1.5 A 5 V 7.5 W
USB-C 1.5 A 5 V 7.5 W
3 A 5 V 15 W
Power Delivery 2.0 Micro-USB 3 A 20 V 60 W
Power Delivery 2.0 Type-A/B/C[e] 5 A 20 V 100 W
^ Jump up to:a b The VBUS supply from a low-powered hub port may drop to 4.40 V.^ Up to five unit loads; with non-SuperSpeed devices, one unit load is 100 mA.^ Up to six unit loads; with SuperSpeed devices, one unit load is 150 mA.^ Up to six unit loads; with multi-lane devices, one unit load is 250 mA.^ Requires active PD 5 A cable.
Release name Release date Max. power Note
USB Battery Charging 1.0 2007-03-08 5 V, ? A
USB Battery Charging 1.1 2009-04-15 5 V, 1.8 A [41]
USB Battery Charging 1.2 2010-12-07 5 V, 5 A [42]
USB Power Delivery revision 1.0 (version 1.0) 2012-07-05 20 V, 5 A Using FSK protocol over bus power (VBUS)
USB Power Delivery revision 1.0 (version 1.3) 2014-03-11 ?
USB Power Delivery revision 2.0 (version 1.0) 2014-08-11 20 V, 5 A Using BMC protocol over communication channel (CC) on USB-C cables.
USB-C 2.0 2014-08-11 5 V, 3 A New connector and cable specification
USB-C 4.2 2015-04-03 5 V, 3 A
USB Power Delivery revision 2.0 (version 1.1) 2015-05-07 20 V, 5 A
USB Power Delivery revision 2.0 (version 1.2) 2016-03-25 20 V, 5 A
USB Power Delivery revision 2.0 (version 1.3) 2017-01-12 20 V, 5 A
USB Power Delivery revision 3.0 (version 1.1) 2017-01-12 20 V, 5 A
USB Power Delivery revision 3.0 (version 1.2) 2018-06-21 20 V, 5 A [43]

参考资料