USB Type-C

From Wikipedia, the free encyclopedia
Jump to: navigation, search
The 24-pin USB Type-C plug
USB Type-C on MacBook

USB Type-C is a specification for a 24-pin reversible-plug connector for USB devices and USB cabling. It was published by the USB Implementers Forum.

Developed at roughly the same time as the USB 3.1 specification, but distinct from it, the USB Type-C Specification 1.0 defines a small reversible-plug connector for USB devices.[1]

Details[edit]

The Type-C plug connects to both hosts and devices, replacing various Type-B and Type-A connectors and cables with a standard meant to be future-proof.[2][3] The 24-pin double-sided connector is similar in size to the Micro-B USB connector, with a type-C port measuring 8.4 millimetres (0.33 in) by 2.6 millimetres (0.10 in). The connector provides four power/ground pairs, two differential pairs for USB 2.0 data bus (though only one pair is implemented in a Type-C cable), four pairs for high-speed data bus, two "sideband use" pins, and two configuration pins for cable orientation detection, dedicated biphase mark code (BMC) configuration data channel, and VCONN +5 V power for active cables.[4][5][6] Connecting an older device to a host with a Type-C receptacle requires a cable or adapter with a Type-A or Type-B plug or receptacle on one end and a Type-C plug on the other end. Legacy adapters with a female Type-C receptacle are not allowed.[7]

Full-featured USB Type-C cables are active, electronically marked cables that contain a chip with an ID function based on the configuration data channel and vendor-defined messages (VDMs) from the USB Power Delivery 2.0 specification. USB Type-C devices also support power currents of 1.5 A and 3.0 A over the 5 V power bus in addition to baseline 900 mA; devices can either negotiate increased USB current through the configuration line, or they can support the full Power Delivery specification using both BMC-coded configuration line and legacy BFSK-coded VBUS line.

Alternate mode[edit]

Alternate Mode dedicates some of the physical wires in the USB Type-C cable for direct device-to-host transmission of alternate data protocols. The four high-speed lanes, two sideband pins, and (for dock, detachable device and permanent cable applications only) two USB 2.0 pins and one configuration pin can be used for Alternate Mode transmission. The modes are configured using VDMs through the configuration channel.

Relation to other specifications[edit]

USB-IF specifications[edit]

As outlined by the USB Type-C Cable and Connector Language Usage Guidelines,[8] if a product supports USB Type-C, it does not necessarily support:

Alternate Mode partner specifications[edit]

The USB IF is working with its Alternate Mode partners to make sure that ports are properly labeled.[9]

  1. DisplayPort Alternate Mode on USB Type-C Connector Standard - published in September 2014, supporting DisplayPort 1.3[10]
  2. MHL Alternate Mode / MHL Alt mode announced November 2014[11] supporting MHL 3.0 [5][12]
  3. Thunderbolt Alternate Mode[13] supporting Thunderbolt 3[14][15][16]

Other serial protocols like PCI Express and Base-T Ethernet[17] are possible.[citation needed]

Connector pinouts and cable wiring[edit]

Connector pinouts[edit]

USB Type-C plug and receptacle pinouts
Pin Name Description Pin Name Description
A1 GND Ground return B12 GND Ground return
A2 SSTXp1 SuperSpeed differential pair #1, TX, positive B11 SSRXp1 SuperSpeed differential pair #1, RX, positive
A3 SSTXn1 SuperSpeed differential pair #1, TX, negative B10 SSRXn1 SuperSpeed differential pair #1, RX, negative
A4 VBUS Bus power B9 VBUS Bus power
A5 CC1 Configuration channel B8 SBU2 Sideband use (SBU)
A6 Dp1 USB 2.0 differential pair, position 1, positive B7 Dn2 USB 2.0 differential pair, position 2, negative[a]
A7 Dn1 USB 2.0 differential pair, position 1, negative B6 Dp2 USB 2.0 differential pair, position 2, positive[a]
A8 SBU1 Sideband use (SBU) B5 CC2 Configuration channel
A9 VBUS Bus power B4 VBUS Bus power
A10 SSRXn2 SuperSpeed differential pair #2, RX, negative B3 SSTXn2 SuperSpeed differential pair #2, TX, negative
A11 SSRXp2 SuperSpeed differential pair #2, RX, positive B2 SSTXp2 SuperSpeed differential pair #2, TX, positive
A12 GND Ground return B1 GND Ground return
  1. ^ a b There is only a single USB 2.0 differential pair in the cable. This pin is not connected in the plug/cable.

Cable wiring[edit]

Full-featured USB 3.1 and 2.0 Type-C cable wiring
Plug 1, Type-C Type-C cable Plug 2, Type-C
Pin Name Wire color Name Description 2.0[a] Pin Name
Shell Shield Braid Shield Cable external braid ✓ Shell Shield
A1, B12,
B1, A12		 GND Tin-plated GND_PWRrt1 Ground for power return ✓ A1, B12,
B1, A12		 GND
GND_PWRrt2 ✗
A4, B9,
B4, A9		 VBUS Red PWR_VBUS1 VBUS power ✓ A4, B9,
B4, A9		 VBUS
PWR_VBUS2 ✗
B5 VCONN Yellow
 PWR_VCONN VCONN power, for active cables ✓ B5 VCONN
A5 CC Blue CC Configuration channel ✓ A5 CC
A6 Dp1 White UTP_Dp[b] Unshielded twisted pair, positive ✓ A6 Dp1
A7 Dn1 Green UTP_Dn[b] Unshielded twisted pair, negative ✓ A7 Dn1
A8 SBU1 Red SBU_A Sideband use A ✗ B8 SBU2
B8 SBU2 Black SBU_B Sideband use B ✗ A8 SBU1
A2 SSTXp1 Yellow[c] SDPp1 Shielded differential pair #1, positive ✗ B11 SSRXp1
A3 SSTXn1 Brown[c] SDPn1 Shielded differential pair #1, negative ✗ B10 SSRXn1
B11 SSRXp1 Green[c] SDPp2 Shielded differential pair #2, positive ✗ A2 SSTXp1
B10 SSRXn1 Orange[c] SDPn2 Shielded differential pair #2, negative ✗ A3 SSTXn1
B2 SSTXp2 White[c] SDPp3 Shielded differential pair #3, positive ✗ A11 SSRXp2
B3 SSTXn2 Black[c] SDPn3 Shielded differential pair #3, negative ✗ A10 SSRXn2
A11 SSRXp2 Red[c] SDPp4 Shielded differential pair #4, positive ✗ B2 SSTXp2
A10 SSRXn2 Blue[c] SDPn4 Shielded differential pair #4, negative ✗ B3 SSTXn2
  1. ^ USB 2.0 Type-C cables do not include wires for USB 3.1, sideband use, or as great power capacity.
  2. ^ a b There is only a single USB 2.0 differential pair in the cable, which is connected on the A side of the plug.
  3. ^ a b c d e f g h Wire colors for differential pairs are not mandated.

Hardware and OS support[edit]

OS support[edit]

  • Windows 10 supports USB Type-C and USB 3.1 alternate modes, billboard, power delivery, audio accessory and USB Dual Role support.[18]
  • Windows 8.1 added USB Type-C and billboard support in an update.[19]
  • OS X supports USB 3.1 and USB Type-C.[20]
  • Android 6 works with USB 3.1 and USB Type-C.[21]
  • Chrome OS supports USB 3.1 and USB Type-C starting with the Chromebook Pixel 2015 and supports USB 3.1 alternate modes, power delivery, and USB Dual Role support.[22]

Hardware support[edit]

Netbooks, tablets[edit]

Among the first devices to accommodate a USB Type-C cable are the Nokia N1 tablet,[23] Apple's 2015 MacBook (which has only a single first-generation USB 3.1 port),[1] Google's second Chromebook Pixel,and the ASUS Transformer book T100HA.

Smartphones[edit]

Storage[edit]

  • LaCie announced a mobile drive.[30][31]
  • SanDisk launched a line of SSDs that connect via 10 Gbit/s USB 3.1 Type-C [32]

Cables[edit]

Some cables with a type C connector on one end and a legacy connector on the other end do not connect the correct resistor to pin A5 of the type C connector, causing a device connected to the cable to incorrectly determine the amount of power it is permitted to draw from the cable. Cables with this issue may not work properly with certain products, including Apple and Google products, and may even damage power sources such as chargers, hubs, or PC USB ports[33][34][35]

References[edit]

  1. ^ a b Hruska, Joel (2015-03-13). "USB-C vs. USB 3.1: What's the difference?". ExtremeTech. Retrieved 2015-04-09. 
  2. ^ Ngo, Dong. "USB Type-C: One cable to connect them all". CNET. Retrieved 2015-06-18. 
  3. ^ "USB Type-C Connector Specifications Finalized". AnandTech.com. Retrieved 2015-06-18. 
  4. ^ "Technical Introduction of the New USB Type-C Connector". Intel.ActiveEvents.com. Retrieved 2015-06-18. 
  5. ^ a b "DisplayPort Alternate Mode for USB Type-C Announced - Video, Power, & Data All Over Type-C". AnandTech.com. Retrieved 2015-06-18. 
  6. ^ "Introduction to USB Type-C" (PDF). Microchip.com. Retrieved 2015-06-18. 
  7. ^ Universal Serial Bus Type-C Cable and Connector Specification Revision 1.1 (April 3, 2015), section 2.2, page 20
  8. ^ "USB Type-C Cable and Connector : Language Usage Guidelines from USB-IF" (PDF). Usb.org. Retrieved 2015-06-18. 
  9. ^ Cunningham, Andrew (2015-01-09). "USB 3.1 and Type-C: The only stuff at CES that everyone is going to use | Ars Technica UK". ArsTechnica.co.uk. Retrieved 2015-06-18. 
  10. ^ "VESA® Brings DisplayPort™ to New USB Type-C Connector". DisplayPort. 2014-09-22. Retrieved 2015-06-18. 
  11. ^ "MHL® – Expand Your World". MHLTech.org. Retrieved 2015-06-18. 
  12. ^ "MHL® – Expand Your World". MHLTech.org. 2014-11-17. Retrieved 2015-06-18. 
  13. ^ "Thunderbolt 3 – The USB-C That Does It All | Thunderbolt Technology Community". Thunderbolttechnology.net. Retrieved 2015-06-18. 
  14. ^ One port to rule them all: Thunderbolt 3 and USB Type-C join forces, retrieved 2015-06-02 
  15. ^ Thunderbolt 3 is twice as fast and uses reversible USB-C, retrieved 2015-06-02 
  16. ^ Thunderbolt 3 embraces USB Type-C connector, doubles bandwidth to 40Gbps, retrieved 2015-06-02 
  17. ^ "[802.3_DIALOG] USB-C Ethernet Alternate Mode". ieee. 2015-03-26. 
  18. ^ Microsoft. "Windows support for USB Type-C connectors". Microsoft MSDN. Retrieved 2015-09-30. 
  19. ^ Microsoft. "Update for USB Type-C billboard support and Kingston thumb drive is enumerated incorrectly in Windows". Retrieved 2015-12-08. 
  20. ^ "Using the USB-C port and adapters on your MacBook (Retina, 12-inch, Early 2015) - Apple Support". Support.Apple.com. 2015-05-28. Retrieved 2015-06-18. 
  21. ^ "Android – Marshmallow". Retrieved 2015-10-12. 
  22. ^ "Charge your Chromebook Pixel (2015)". Retrieved 2015-10-31. 
  23. ^ Vlad Savov (18 November 2014). "The Nokia N1 will be among the first devices with a reversible USB connector". The Verge. Vox Media. 
  24. ^ Boxall, Andy (2015-04-14). "Letv Le Superphone: Features, News, Release, Specs". Digitaltrends.com. Retrieved 2015-06-18. 
  25. ^ Pei, Carl (2015-06-23). "OnePlus 2 - The First Flagship with USB Type C". oneplus.net. Retrieved 2015-06-23. 
  26. ^ OnePlus 2 Type-C USB Cable Pics - News Exprezz, June 25, 2015.
  27. ^ "Microsoft Lumia 950 and 950 XL arrive with Windows 10 and USB Type-C". 
  28. ^ "Lenovo ZUK Z1 Snapdragon 5.5 Inch 4G LTE Dual SIM Android 5.1 Mobile Phone 64GB White". 
  29. ^ "LG G5 officially announced: release date, specs, and features". 
  30. ^ Ian Paul. "LaCie announces USB Type-C mobile drives to match Apple's 12-inch MacBook". Macworld. Retrieved 2015-06-18. 
  31. ^ "Porsche Design". LaCie. Retrieved 2015-06-18. 
  32. ^ "Computex 2015: 1.92TB Portable USB 3.1 SSD storage from Sandisk". Guru3d.com. Retrieved 2015-06-18. 
  33. ^ Kif Leswing (5 November 2015). "Google Engineer Reviews Defective USB Cables on Amazon - Fortune". Fortune. 
  34. ^ Universal Serial Bus Type-C Cable and Connector Specification Revision 1.1 (April 3, 2015), page 60, table 3-13, note 1
  35. ^ "In response to the Type-C cable discussions". 

External links[edit]

  • The Universal Serial Bus Type-C Cable and Connector Specification is included in a set of USB documents which can be downloaded from USB.org.
  • Media related to USB Type-C at Wikimedia Commons
USB-IF specifications
USB device classes
Other
Retrieved from "https://en.wikipedia.org/w/index.php?title=USB_Type-C&oldid=708727583"