USB Type C 1.2 Protocol

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Release 1.2 - 1 - USB Type-C Cable and

March 25, 2016 Connector Specification

Universal Serial Bus

Type-C Cable and Connector

Specification

Revision 1.2

March 25, 2016

Release 1.2 - 2 - USB Type-C Cable and

March 25, 2016 Connector Specification

Hewlett-Packard Company, Intel Corporation, Microsoft Corporation,

Renesas, STMicroelectronics, and Texas Instruments

NOTE: Adopters may only use the USB Type-C™ cable and connector to implement USB or third

party functionality as expressly described in this Specification; all other uses are prohibited.

LIMITED COPYRIGHT LICENSE: The USB 3.0 Promoters grant a conditional copyright license under

the copyrights embodied in the USB Type-C Cable and Connector Specification to use and reproduce

the Specification for the sole purpose of, and solely to the extent necessary for, evaluating whether to

implement the Specification in products that would comply with the specification. Without limiting

the foregoing, use of the Specification for the purpose of filing or modifying any patent application to

target the Specification or USB compliant products is not authorized. Except for this express

licenses. In order to obtain any additional intellectual property licenses or licensing commitments

associated with the Specification a party must execute the USB 3.0 Adopters Agreement. NOTE: By

using the Specification, you accept these license terms on your own behalf and, in the case where you

are doing this as an employee, on behalf of your employer.

INTELLECTUAL PROPERTY DISCLAIMER

THIS SPECIFICATION IS PROVIDED TO YOU “AS IS” WITH NO WARRANTIES WHATSOEVER,

INCLUDING ANY WARRANTY OF MERCHANTABILITY, NON-INFRINGEMENT, OR FITNESS

FOR ANY PARTICULAR PURPOSE. THE AUTHORS OF THIS SPECIFICATION DISCLAIM ALL

LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PROPRIETARY RIGHTS,

RELATING TO USE OR IMPLEMENTATION OF INFORMATION IN THIS SPECIFICATION. THE

PROVISION OF THIS SPECIFICATION TO YOU DOES NOT PROVIDE YOU WITH ANY LICENSE,

EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY

RIGHTS.

All implementation examples and reference designs contained within this Specification are

included as part of the limited patent license for those companies that execute the USB 3.0

Adopters Agreement.

USB Type-C™ and USB-C™ are trademarks of the Universal Serial Bus Implementers Forum

(USB-IF). All product names are trademarks, registered trademarks, or service marks of

their respective owners.

Release 1.2 - 3 - USB Type-C Cable and

March 25, 2016 Connector Specification

CONTENTS

Specification Work Group Chairs / Specification Editors .................................................... 11

Specification Work Group Contributors .................................................................................... 11

Pre-Release Draft Industry Reviewing Companies That Provided Feedback ................. 13

Revision History ................................................................................................................................ 14

1 Introduction ............................................................................................................................... 15

1.1 Purpose ............................................................................................................................ 15

1.2 Scope ................................................................................................................................. 15

1.3 Related Documents....................................................................................................... 16

1.4 Conventions .................................................................................................................... 16

1.4.1 Precedence ...................................................................................................... 16

1.4.2 Keywords ......................................................................................................... 16

1.4.3 Numbering ....................................................................................................... 17

1.5 Terms and Abbreviations ........................................................................................... 17

2 Overview ..................................................................................................................................... 20

2.1 Introduction ................................................................................................................... 20

2.2 USB Type-C Receptacles, Plugs and Cables ........................................................... 21

2.3 Configuration Process ................................................................................................. 22

2.3.1 Source-to-Sink Attach/Detach Detection ............................................... 23

2.3.2 Plug Orientation/Cable Twist Detection ................................................ 23

2.3.3 Initial Power (Source-to-Sink) Detection and Establishing the Data

(Host-to-Device) Relationship ................................................................... 23

2.3.4 USB Type-C VBUS Current Detection and Usage ................................... 24

2.3.5 USB PD Communication ............................................................................... 24

2.3.6 Functional Extensions .................................................................................. 25

2.4 VBUS ................................................................................................................................... 25

2.5 VCONN ................................................................................................................................ 25

2.6 Hubs .................................................................................................................................. 26

3 Mechanical .................................................................................................................................. 27

3.1 Overview ......................................................................................................................... 27

3.1.1 Compliant Connectors .................................................................................. 27

3.1.2 Compliant Cable Assemblies ...................................................................... 27

3.1.3 Compliant USB Type-C to Legacy Cable Assemblies ........................... 27

3.1.4 Compliant USB Type-C to Legacy Adapter Assemblies ...................... 28

3.2 USB Type-C Connector Mating Interfaces ............................................................. 28

3.2.1 Interface Definition....................................................................................... 28

3.2.2 Reference Designs ......................................................................................... 48

3.2.3 Pin Assignments and Descriptions ........................................................... 55

3.3 Cable Construction and Wire Assignments ........................................................... 56

3.3.1 Cable Construction (Informative) ............................................................ 56

3.3.2 Wire Assignments ......................................................................................... 58

3.3.3 Wire Gauges and Cable Diameters (Informative) ................................ 59

Release 1.2 - 4 - USB Type-C Cable and

March 25, 2016 Connector Specification

3.4

Standard USB Type-C Cable Assemblies ................................................................ 61

3.4.1 USB Full-Featured Type-C Cable Assembly ........................................... 61

3.4.2 USB 2.0 Type-C Cable Assembly ................................................................ 62

3.4.3 USB Type-C Captive Cable Assemblies .................................................... 63

3.5 Legacy Cable Assemblies ............................................................................................ 63

3.5.1 USB Type-C to USB 3.1 Standard-A Cable Assembly ........................... 64

3.5.2 USB Type-C to USB 2.0 Standard-A Cable Assembly ........................... 65

3.5.3 USB Type-C to USB 3.1 Standard-B Cable Assembly ........................... 66

3.5.4 USB Type-C to USB 2.0 Standard-B Cable Assembly ........................... 67

3.5.5 USB Type-C to USB 2.0 Mini-B Cable Assembly .................................... 68

3.5.6 USB Type-C to USB 3.1 Micro-B Cable Assembly .................................. 69

3.5.7 USB Type-C to USB 2.0 Micro-B Cable Assembly .................................. 70

3.6 Legacy Adapter Assemblies ....................................................................................... 70

3.6.1 USB Type-C to USB 3.1 Standard-A Receptacle Adapter Assembly 71

3.6.2 USB Type-C to USB 2.0 Micro-B Receptacle Adapter Assembly ....... 72

3.7 Electrical Characteristics ........................................................................................... 74

3.7.1 Raw Cable (Informative) ............................................................................. 74

3.7.2 USB Type-C to Type-C Passive Cable Assemblies (Normative) ....... 75

3.7.3 Mated Connector (Informative) ................................................................ 88

3.7.4 USB Type-C to Legacy Cable Assemblies (Normative) ....................... 91

3.7.5 USB Type-C to USB Legacy Adapter Assemblies (Normative) ......... 95

3.7.6 Shielding Effectiveness Requirements (Normative) ........................... 97

3.7.7 DC Electrical Requirements (Normative) .............................................. 99

3.8 Mechanical and Environmental Requirements (Normative) ........................ 102

3.8.1 Mechanical Requirements ........................................................................ 102

3.8.2 Environmental Requirements................................................................. 108

3.9 Docking Applications (Informative) .................................................................... 109

3.10 Implementation Notes and Design Guides ......................................................... 110

3.10.1 EMC Management (Informative)............................................................ 110

3.10.2 Stacked and Side-by-Side Connector Physical Spacing

(Informative) ............................................................................................... 113

3.10.3 Cable Mating Considerations (Informative) ....................................... 113

4 Functional ................................................................................................................................ 115

4.1 Signal Summary .......................................................................................................... 115

4.2 Signal Pin Descriptions ............................................................................................ 115

4.2.1 SuperSpeed USB Pins ................................................................................ 115

4.2.2 USB 2.0 Pins ................................................................................................. 116

4.2.3 Auxiliary Signal Pins .................................................................................. 116

4.2.4 Power and Ground Pins ............................................................................ 116

4.2.5 Configuration Pins ..................................................................................... 116

4.3 Sideband Use (SBU)................................................................................................... 116

4.4 Power and Ground ..................................................................................................... 116

4.4.1 IR Drop........................................................................................................... 116

4.4.2 VBUS................................................................................................................. 117

Release 1.2 - 5 - USB Type-C Cable and

March 25, 2016 Connector Specification

4.4.3

VCONN .............................................................................................................. 118

4.5 Configuration Channel (CC) .................................................................................... 120

4.5.1 Architectural Overview ............................................................................ 120

4.5.2 CC Functional and Behavioral Requirements .................................... 133

4.5.3 USB Port Interoperability Behavior ...................................................... 155

4.6 Power............................................................................................................................. 166

4.6.1 Power Requirements during USB Suspend ......................................... 167

4.6.2 VBUS Power Provided Over a USB Type-C Cable ............................... 168

4.7 USB Hubs ...................................................................................................................... 171

4.8 Chargers ........................................................................................................................ 171

4.8.1 DFP as a Power Source ............................................................................. 171

4.8.2 Non-USB Charging Methods .................................................................... 174

4.8.3 Sinking Host ................................................................................................. 174

4.8.4 Sourcing Device ........................................................................................... 174

4.8.5 Charging a System with a Dead Battery .............................................. 174

4.9 Electronically Marked Cables ................................................................................. 175

4.10 VCONN-Powered Accessories ................................................................................... 176

4.11 Parameter Values ....................................................................................................... 177

4.11.1 Termination Parameters .......................................................................... 177

4.11.2 Timing Parameters ..................................................................................... 179

4.11.3 Voltage Parameters .................................................................................... 181

5 Functional Extensions .......................................................................................................... 183

5.1 Alternate Modes ......................................................................................................... 183

5.1.1 Alternate Mode Architecture .................................................................. 183

5.1.2 Alternate Mode Requirements ............................................................... 183

5.1.3 Parameter Values ....................................................................................... 187

5.1.4 Example Alternate Mode – USB DisplayPort™ Dock ........................ 188

5.2 Managed Active Cables ............................................................................................. 190

5.2.1 Requirements for Managed Active Cables that respond to SOP’ and

SOP” ................................................................................................................ 190

5.2.2 Cable Message Structure .......................................................................... 192

5.2.3 Modal Cable Management ........................................................................ 192

A Audio Adapter Accessory Mode ........................................................................................ 194

A.1. Overview ...................................................................................................................... 194

A.2. Detail ............................................................................................................................. 194

A.3. Electrical Requirements .......................................................................................... 195

A.4. Example Implementations ...................................................................................... 197

A.4.1. Passive 3.5 mm to USB Type-C Adapter – Single Pole Detection

Switch ............................................................................................................. 197

A.4.2. 3.5 mm to USB Type-C Adapter Supporting 500 mA Charge-

Through ......................................................................................................... 197

B Debug Accessory Mode ........................................................................................................ 199

B.1. Overview ...................................................................................................................... 199

B.2. Functional .................................................................................................................... 199

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