USB Type-C 线缆和接口规范 Rev. 2.1 2021.5
Universal Serial BusType-C Cable and Connector Specification
Release 2.1
May 2021
链接: https://pan.baidu.com/s/11Y8cy69-a4-Wc0YkG48ttQ 提取码: mam5
CONTENTS
Specification Work Group Chairs / Specification Editors ................................................... 16
Specification Work Group Contributors .................................................................................. 16
Pre-Release Draft Industry Reviewing Companies That Provided Feedback ................ 23
Revision History ............................................................................................................................. 23
1 Introduction ............................................................................................................................ 24
1.1 Purpose ......................................................................................................................... 24
1.2 Scope ............................................................................................................................. 24
1.3 Related Documents .................................................................................................... 25
1.4 Conventions ................................................................................................................. 25
1.4.1 Precedence .................................................................................................... 25
1.4.2 Keywords ...................................................................................................... 25
1.4.3 Numbering .................................................................................................... 26
1.5 Terms and Abbreviations ......................................................................................... 26
2 Overview .................................................................................................................................. 31
2.1 Introduction ................................................................................................................ 31
2.2 USB Type-C Receptacles, Plugs and Cables ......................................................... 32
2.3 Configuration Process ............................................................................................... 33
2.3.1 Source-to-Sink Attach/Detach Detection .............................................. 34
2.3.2 Plug Orientation/Cable Twist Detection ............................................... 34
2.3.3 Initial Power (Source-to-Sink) Detection and Establishing the Data (Host-to-Device) Relationship ................................................................. 34
2.3.4 USB Type-C VBUS Current Detection and Usage .................................. 35
2.3.5 USB PD Communication ............................................................................. 36
2.3.6 Functional Extensions ................................................................................ 36
2.4 VBUS ................................................................................................................................ 36
2.5 VCONN ............................................................................................................................. 37
2.6 Hubs ............................................................................................................................... 38
3 Mechanical ............................................................................................................................... 39
3.1 Overview ...................................................................................................................... 39
3.1.1 Compliant Connectors................................................................................ 39
3.1.2 Compliant Cable Assemblies .................................................................... 39
3.1.3 Compliant USB Type-C to Legacy Cable Assemblies .......................... 40
3.1.4 Compliant USB Type-C to Legacy Adapter Assemblies ..................... 41
3.2 USB Type-C Connector Mating Interfaces ............................................................ 41
3.2.1 Interface Definition .................................................................................... 41
3.2.2 Reference Designs ....................................................................................... 64
3.2.3 Pin Assignments and Descriptions ......................................................... 71
3.3 Cable Construction and Wire Assignments ......................................................... 72
3.3.1 Cable Construction (Informative) ........................................................... 72
3.3.2 Wire Assignments ....................................................................................... 74
3.3.3 Wire Gauges and Cable Diameters (Informative) ............................... 75
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3.4 Standard USB Type-C Cable Assemblies .............................................................. 77
3.4.1 USB Full-Featured Type-C Cable Assembly .......................................... 77
3.4.2 USB 2.0 Type-C Cable Assembly .............................................................. 78
3.4.3 USB Type-C Captive Cable Assemblies .................................................. 79
3.4.4 USB Type-C Thumb Drive Assemblies ................................................... 79
3.5 Legacy Cable Assemblies .......................................................................................... 80
3.5.1 USB Type-C to USB 3.1 Standard-A Cable Assembly .......................... 80
3.5.2 USB Type-C to USB 2.0 Standard-A Cable Assembly .......................... 82
3.5.3 USB Type-C to USB 3.1 Standard-B Cable Assembly .......................... 83
3.5.4 USB Type-C to USB 2.0 Standard-B Cable Assembly .......................... 84
3.5.5 USB Type-C to USB 2.0 Mini-B Cable Assembly ................................... 85
3.5.6 USB Type-C to USB 3.1 Micro-B Cable Assembly ................................. 86
3.5.7 USB Type-C to USB 2.0 Micro-B Cable Assembly ................................. 88
3.6 Legacy Adapter Assemblies ..................................................................................... 89
3.6.1 USB Type-C to USB 3.1 Standard-A Receptacle Adapter Assembly 89
3.6.2 USB Type-C to USB 2.0 Micro-B Receptacle Adapter Assembly ...... 91
3.7 Electrical Characteristics ......................................................................................... 92
3.7.1 Raw Cable (Informative) ........................................................................... 92
3.7.2 USB Type-C to Type-C Passive Cable Assemblies (Normative) ....... 93
3.7.3 Mated Connector (Informative – USB 3.2 Gen2 and USB4 Gen2) . 115
3.7.4 Receptacle Connector SI Requirements and Testing (Normative – USB4 Gen3) ................................................................................................. 118
3.7.5 USB Type-C to Legacy Cable Assemblies (Normative) .................... 119
3.7.6 USB Type-C to USB Legacy Adapter Assemblies (Normative) ....... 123
3.7.7 Shielding Effectiveness Requirements (Normative) ........................ 125
3.7.8 DC Electrical Requirements (Normative) ........................................... 128
3.8 Mechanical and Environmental Requirements (Normative) ........................ 131
3.8.1 Mechanical Requirements ....................................................................... 132
3.8.2 Environmental Requirements ................................................................ 137
3.9 Docking Applications (Informative) ................................................................... 138
3.10 Implementation Notes and Design Guides ........................................................ 139
3.10.1 EMC Management (Informative) ........................................................... 139
3.10.2 Stacked and Side-by-Side Connector Physical Spacing (Informative) ....................................................................................................................... 142
3.10.3 Cable Mating Considerations (Informative) ...................................... 142
3.11 Extended Power Range (EPR) Cables ................................................................. 143
3.11.1 Electrical Requirements .......................................................................... 143
3.11.2 EPR Cable Indentification Requirements ............................................ 143
4 Functional .............................................................................................................................. 144
4.1 Signal Summary ........................................................................................................ 144
4.2 Signal Pin Descriptions ........................................................................................... 144
4.2.1 SuperSpeed USB Pins ............................................................................... 144
4.2.2 USB 2.0 Pins ................................................................................................ 145
4.2.3 Auxiliary Signal Pins ................................................................................ 145
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4.2.4 Power and Ground Pins ........................................................................... 145
4.2.5 Configuration Pins .................................................................................... 145
4.3 Sideband Use (SBU) ................................................................................................. 145
4.4 Power and Ground ................................................................................................... 146
4.4.1 IR Drop ......................................................................................................... 146
4.4.2 VBUS ............................................................................................................... 147
4.4.3 VCONN ............................................................................................................ 149
4.5 Configuration Channel (CC) ................................................................................... 155
4.5.1 Architectural Overview ........................................................................... 155
4.5.2 CC Functional and Behavioral Requirements .................................... 168
4.5.3 USB Port Interoperability Behavior ..................................................... 206
4.6 Power .......................................................................................................................... 225
4.6.1 Power Requirements during USB Suspend ........................................ 226
4.6.2 VBUS Power Provided Over a USB Type-C Cable ............................... 227
4.7 USB Hubs .................................................................................................................... 233
4.8 Power Sourcing and Charging ............................................................................... 234
4.8.1 DFP as a Power Source ............................................................................ 234
4.8.2 Non-USB Charging Methods ................................................................... 237
4.8.3 Sinking Host ............................................................................................... 237
4.8.4 Sourcing Device ......................................................................................... 237
4.8.5 Charging a System with a Dead Battery .............................................. 237
4.8.6 USB Type-C Multi-Port Chargers ........................................................... 237
4.9 Electronically Marked Cables ............................................................................... 240
4.9.1 Parameter Values ...................................................................................... 242
4.9.2 Active Cables .............................................................................................. 242
4.10 VCONN-Powered Accessories (VPAs) and VCONN-Powered USB Devices (VPDs) ......................................................................................................................... 242
4.10.1 VCONN-Powered Accessories (VPAs) .................................................... 242
4.10.2 VCONN-Powered USB Devices (VPDs) ................................................... 243
4.11 Parameter Values ..................................................................................................... 245
4.11.1 Termination Parameters ......................................................................... 245
4.11.2 Timing Parameters ................................................................................... 247
4.11.3 Voltage Parameters .................................................................................. 250
5 USB4 Discovery and Entry ................................................................................................ 252
5.1 Overview of the Discovery and Entry Process ................................................. 252
5.2 USB4 Functional Requirements ............................................................................ 253
5.2.1 USB4 Host Functional Requirements ................................................... 253
5.2.2 USB4 Device Functional Requirements ............................................... 253
5.2.3 USB4 Alternate Mode Support ............................................................... 253
5.2.3.1 USB4 Alternate Mode Support on Hosts ............................................. 253
5.2.3.2 USB4 Alternate Mode Support on Hubs and USB4-based Docks .. 253
5.3 USB4 Power Requirements .................................................................................... 254
5.3.1 Source Power Requirements .................................................................. 254
5.3.2 Sink Power Requirements ...................................................................... 254
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5.3.3 Device Power Management Requirements ......................................... 255
5.4 USB4 Discovery and Entry Flow Requirements ............................................... 255
5.4.1 USB Type-C Initial Connection .............................................................. 255
5.4.2 USB Power Delivery Contract ................................................................ 255
5.4.3 USB4 Discovery and Entry Flow ............................................................ 256
5.4.3.1 USB4 Device Discovery (SOP) ................................................................ 257
5.4.3.2 USB4 Cable Discovery (SOP’) ................................................................. 257
5.4.3.3 USB4 Operational Entry .......................................................................... 260
5.4.4 USB4 Post-Entry Operation .................................................................... 260
5.4.4.1 During USB4 Operation ........................................................................... 260
5.4.4.2 Exiting USB4 Operation ........................................................................... 260
5.5 USB4 Hub Connection Requirements .................................................................. 261
5.5.1 USB4 Hub Port Initial Connection Requirements ............................. 261
5.5.2 USB4 Hub UFP and Host Capabilities Discovery ............................... 261
5.5.3 Hub DFP Connection Requirements ..................................................... 262
5.5.3.1 Speculative Connections ......................................................................... 262
5.5.3.2 Operational Connections ......................................................................... 262
5.5.4 Hub Ports Connection Behavior Flow Examples ............................... 263
5.5.5 Connecting to Downstream USB4 Hubs .............................................. 268
5.5.6 Fallback Functional Requirements for USB4 Hubs .......................... 268
5.6 USB4 Device Connection Requirements ............................................................. 269
5.6.1 Fallback Mapping of USB4 Peripheral Functions to USB Device Class Types ................................................................................................. 269
5.7 Parameter Values ..................................................................................................... 270
5.7.1 Timing Parameters ................................................................................... 270
6 Active Cables ......................................................................................................................... 271
6.1 USB Type-C State Machine ..................................................................................... 273
6.2 USB PD Requirements ............................................................................................. 273
6.2.1 Active Cable USB PD Requirements ..................................................... 275
6.2.2 USB PD Messages for OIAC ..................................................................... 276
6.2.3 Short Active Cable Behaviors in Response to Power Delivery Events ........................................................................................................... 288
6.3 OIAC Connection Flow and State Diagrams ....................................................... 288
6.3.1 OIAC Connection Flow – Discovery – Phase 1 ................................... 289
6.3.2 OIAC Connection Flow – Reboot – Phase 2 ......................................... 290
6.3.3 OIAC Connection Flow – Configuration – Phase 3 ............................ 291
6.3.4 OIAC Connection State Diagram Plug-A .............................................. 294
6.3.5 OIAC Connection State Diagram Plug-B .............................................. 302
6.4 Active Cable Power Requirements ...................................................................... 307
6.4.1 VBUS Requirements ................................................................................... 307
6.4.2 OIAC VBUS Requirements......................................................................... 307
6.4.3 USB PD Rules in Active State .................................................................. 309
6.4.4 VCONN Requirements ................................................................................ 310
6.5 Mechanical ................................................................................................................. 310
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6.5.1 Thermal ....................................................................................................... 310
6.5.2 Plug Spacing ............................................................................................... 311
6.6 Electrical Requirements ......................................................................................... 311
6.6.1 Shielding Effectiveness Requirement .................................................. 311
6.6.2 Low Speed Signal Requirement ............................................................. 311
6.6.3 USB 2.0 ......................................................................................................... 312
6.6.4 USB 3.2 ......................................................................................................... 313
6.6.5 USB4 ............................................................................................................. 320
6.6.6 Return Loss ................................................................................................. 334
6.7 Active Cables That Support Alternate Modes ................................................... 334
6.7.1 Discover SVIDs ........................................................................................... 334
6.7.2 Discover Modes ......................................................................................... 334
6.7.3 Enter/Exit Modes ...................................................................................... 334
6.7.4 Power in Alternate Modes ...................................................................... 334
A Audio Adapter Accessory Mode ....................................................................................... 335
A.1 Overview .................................................................................................................... 335
A.2 Detail ........................................................................................................................... 335
A.3 Electrical Requirements ......................................................................................... 336
A.4 Example Implementations ..................................................................................... 338
A.4.1 Passive 3.5 mm to USB Type-C Adapter – Single Pole Detection Switch ........................................................................................................... 338
A.4.2 3.5 mm to USB Type-C Adapter Supporting 500 mA Charge-Through ....................................................................................................... 338
B Debug Accessory Mode....................................................................................................... 340
B.1 Overview .................................................................................................................... 340
B.2 Functional .................................................................................................................. 340
B.2.1 Signal Summary ......................................................................................... 341
B.2.2 Port Interoperability ................................................................................ 341
B.2.3 Debug Accessory Mode Entry ................................................................ 341
B.2.4 Connection State Diagrams .................................................................... 342
B.2.5 DTS Port Interoperability Behavior ..................................................... 351
B.2.6 Orientation Detection .............................................................................. 360
B.3 Security/Privacy Requirements: .......................................................................... 361
C USB Type-C Digital Audio .................................................................................................. 362
C.1 Overview .................................................................................................................... 362
C.2 USB Type-C Digital Audio Specifications ........................................................... 362
D Thermal Design Considerations for Active Cables ...................................................... 364
D.1 Introduction .............................................................................................................. 364
D.2 Model ........................................................................................................................... 364
D.2.1 Assumptions ............................................................................................... 364
D.2.2 Model Architecture ................................................................................... 365
D.2.3 Heat Sources ............................................................................................... 366
D.2.4 Heat Flow .................................................................................................... 366
D.3 USB 3.2 Single Lane Active Cable ......................................................................... 367
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D.3.1 USB 3.2 Single-Lane Active Cable Design Considerations .............. 367
D.4 Dual-Lane Active Cables ......................................................................................... 370
D.4.1 USB 3.2 Dual-Lane Active Cable Design Considerations ................. 370
D.4.2 USB 3.2 Dual-Lane Active Cable in a Multi-Port Configuration .... 372
D.5 USB 3.2 Host and Device Design Considerations ............................................. 374
D.5.1 Heat Spreading or Heat Sinking from Host or Device ..................... 374
D.5.2 Motherboard Temperature Control ..................................................... 375
D.5.3 Wider Port Spacing for Multi-Port Applications ............................... 375
D.5.4 Power Policies ............................................................................................ 375
E Alternate Modes ................................................................................................................... 376
E.1 Alternate Mode Architecture ................................................................................ 376
E.2 Alternate Mode Requirements .............................................................................. 376
E.2.1 Alternate Mode Pin Reassignment........................................................ 377
E.2.2 Alternate Mode Electrical Requirements ............................................ 378
E.3 Parameter Values ..................................................................................................... 380
E.4 Example Alternate Mode – USB DisplayPort™ Dock ....................................... 381
E.4.1 USB DisplayPort™ Dock Example .......................................................... 381
E.4.2 Functional Overview ................................................................................ 382
E.4.3 Operational Summary .............................................................................. 383
F Thunderbolt 3 Compatibility Discovery and Entry ..................................................... 385
F.1 TBT3 Compatibility Mode Functional Requirements ..................................... 385
F.1.1 TBT3-Compatible Power Requirements ............................................. 385
F.1.2 TBT3-Compatible Host Requirements ................................................. 385
F.1.3 TBT3-Compatible Device Upstream Requirements.......................... 385
F.1.4 TBT3-Compatible Device Downstream Requirements .................... 385
F.1.5 TBT3-Compatible Self-Powered Device Without Predefined Upstream Port Rules ................................................................................ 386
F.1.6 TBT3-Compatible Devices with a Captive Cable ............................... 386
F.2 TBT3 Discovery and Entry Flow .......................................................................... 386
F.2.1 TBT3 Passive Cable Discover Identity Responses ............................ 388
F.2.2 TBT3 Active Cable Discover Identity Responses .............................. 390
F.2.3 TBT3 Device Discover Identity Responses ......................................... 393
F.2.4 TBT3 Discover SVID Responses ............................................................ 394
F.2.5 TBT3 Device Discover Mode Responses .............................................. 395
F.2.6 TBT3 Cable Discover Mode Responses ................................................ 396
F.2.7 TBT3 Cable Enter Mode Command ....................................................... 397
F.2.8 TBT3 Device Enter Mode Command ..................................................... 398
F.2.9 TBT3 Cable Functional Difference Summary ..................................... 400
G Extracting Pulse Response from Sampled Data and Calculating Non-Linearity Noise ....................................................................................................................................... 401
H USB PD High-Voltage Design Considerations ............................................................... 403
H.1 Potential for Arcing Damage During Cable Withdrawal ................................ 403
H.2 USB Type-C Cable Withdrawal Arcing Due to Sink Discharge ...................... 403
H.3 Mitigating Arcing Damage During Cable Withdrawal ..................................... 405
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H.3.1 Limiting Sink Discharge Rate ................................................................. 406
H.3.2 Load Removal ............................................................................................. 408
H.3.3 Limiting Source Current Capability ...................................................... 410
FIGURES
Figure 2-1 USB Type-C Receptacle Interface (Front View) ..................................................................................... 31
Figure 2-2 USB Full-Featured Type-C Plug Interface (Front View) ..................................................................... 32
Figure 3-1 USB Type-C Receptacle Interface Dimensions ........................................................................................ 45
Figure 3-2 Reference Design USB Type-C Plug External EMC Spring Contact Zones .................................. 48
Figure 3-3 USB Full-Featured Type-C Plug Interface Dimensions ....................................................................... 49
Figure 3-4 Reference Footprint for a USB Type-C Vertical Mount Receptacle (Informative) .................. 52
Figure 3-5 Reference Footprint for a USB Type-C Dual-Row SMT Right Angle Receptacle (Informative) ....................................................................................................................................................................... 53
Figure 3-6 Reference Footprint for a USB Type-C Hybrid Right-Angle Receptacle (Informative) ........ 54
Figure 3-7 Reference Footprint for a USB Type-C Mid-Mount Dual-Row SMT Receptacle (Informative) ....................................................................................................................................................................... 55
Figure 3-8 Reference Footprint for a USB Type-C Mid-Mount Hybrid Receptacle (Informative) .......... 56
Figure 3-9 Reference Footprint for a USB 2.0 Type-C Through Hole Right Angle Receptacle (Informative) ....................................................................................................................................................................... 57
Figure 3-10 Reference Footprint for a USB 2.0 Type-C Single Row Right Angle Receptacle (Informative) ....................................................................................................................................................................... 58
Figure 3-11 USB 2.0 Type-C Plug Interface Dimensions ........................................................................................... 60
Figure 3-12 USB Type-C Plug EMC Shielding Spring Tip Requirements ........................................................... 63
Figure 3-13 Reference Design of Receptacle Mid-Plate ............................................................................................ 64
Figure 3-14 Reference Design of the Retention Latch ............................................................................................... 65
Figure 3-15 Illustration of the Latch Soldered to the Paddle Card Ground ...................................................... 65
Figure 3-16 Reference Design of the USB Full-Featured Type-C Plug Internal EMC Spring ..................... 66
Figure 3-17 Reference Design of the USB 2.0 Type-C Plug Internal EMC Spring ........................................... 67
Figure 3-18 Reference Design of Internal EMC Pad .................................................................................................... 68
Figure 3-19 Reference Design of a USB Type-C Receptacle with External EMC Springs ............................ 69
Figure 3-20 Reference Design for a USB Full-Featured Type-C Plug Paddle Card ........................................ 70
Figure 3-21 Illustration of a USB Full-Featured Type-C Cable Cross Section, a Coaxial Wire Example with VCONN ............................................................................................................................................................................ 73
Figure 3-22 Illustration of a USB Full-Featured Type-C Cable Cross Section, a Coaxial Wire Example without VCONN ..................................................................................................................................................................... 73
Figure 3-23 USB Full-Featured Type-C Standard Cable Assembly ....................................................................... 77
Figure 3-24 USB Type-C to USB 3.1 Standard-A Cable Assembly ......................................................................... 80
Figure 3-25 USB Type-C to USB 2.0 Standard-A Cable Assembly ......................................................................... 82
Figure 3-26 USB Type-C to USB 3.1 Standard-B Cable Assembly.......................................................................... 83
Figure 3-27 USB Type-C to USB 2.0 Standard-B Cable Assembly.......................................................................... 84
Figure 3-28 USB Type-C to USB 2.0 Mini-B Cable Assembly ................................................................................... 85
Figure 3-29 USB Type-C to USB 3.1 Micro-B Cable Assembly ................................................................................ 86
Figure 3-30 USB Type-C to USB 2.0 Micro-B Cable Assembly ................................................................................ 88
Figure 3-31 USB Type-C to USB 3.1 Standard-A Receptacle Adapter Assembly ............................................ 89
Figure 3-32 USB Type-C to USB 2.0 Micro-B Receptacle Adapter Assembly ................................................... 91
Figure 3-33 Illustration of Test Points for a Mated Cable Assembly ................................................................... 93
Figure 3-34 Recommended Differential Insertion Loss Requirement (USB 3.2 Gen2 and USB4 Gen2).................................................................................................................................................................................................... 94
Figure 3-35 Recommended Differential Return Loss Requirement .................................................................... 95
Figure 3-36 Recommended Differential Crosstalk Requirement ......................................................................... 95
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Figure 3-37 Recommended Differential Near-End and Far-End Crosstalk Requirement between USB D+/D− Pair and TX/RX Pair .......................................................................................................................................... 96
Figure 3-38 Recommended Differential Insertion Loss Requirement (USB4 Gen3) ................................... 96
Figure 3-39 Illustration of Insertion Loss Fit at Nyquist Frequency ................................................................... 98
Figure 3-40 Input Pulse Spectrum ...................................................................................................................................... 99
Figure 3-41 IMR Limit as Function of ILfitatNq ............................................................................................................ 99
Figure 3-42 IRL Limit as Function of ILfitatNq .......................................................................................................... 101
Figure 3-43 Differential-to-Common-Mode Conversion Requirement ........................................................... 102
Figure 3-44 IMR Limit as Function of ILfit at 10 GHz (USB4 Gen3) ................................................................. 105
Figure 3-45 Definition of Port, Victim, and Aggressor ............................................................................................ 106
Figure 3-46 IXT_DP and IXT_USB Limit as Function of ILfit at 10 GHz (USB4 Gen3) ............................... 106
Figure 3-47 IRL Limit as Function of ILfitatNq (USB4 Gen3) .............................................................................. 107
Figure 3-48 Differential-to-Commom-Mode Conversion Requirement (USB4 Gen3) ............................. 107
Figure 3-49 Cable Assembly in System .......................................................................................................................... 108
Figure 3-50 Requirement for Differential Coupling between CC and D+/D− .............................................. 110
Figure 3-51 Requirement for Single-Ended Coupling between CC and D− in USB 2.0 Type-C Cables................................................................................................................................................................................................. 111
Figure 3-52 Requirement for Single-Ended Coupling between CC and D− in USB Full-Featured Type-C Cables ............................................................................................................................................................................... 111
Figure 3-53 Requirement for Differential Coupling between VBUS and D+/D− .......................................... 112
Figure 3-54 Requirement for Single-Ended Coupling between SBU_A and SBU_B .................................... 113
Figure 3-55 Requirement for Single-Ended Coupling between SBU_A/SBU_B and CC ............................ 113
Figure 3-56 Requirement for Coupling between SBU_A and differential D+/D−, and SBU_B and differential D+/D− .......................................................................................................................................................... 114
Figure 3-57 Illustration of USB Type-C Mated Connector ..................................................................................... 115
Figure 3-58 Recommended Impedance Limits of a USB Type-C Mated Connector ................................... 115
Figure 3-59 Recommended Ground Void Dimensions for USB Type-C Receptacle ................................... 116
Figure 3-60 Recommended Differential Near-End and Far-End Crosstalk Limits between D+/D− Pair and TX/RX Pairs .............................................................................................................................................................. 118
Figure 3-61 Recommended Limits for Differential-to-Common-Mode Conversion .................................. 118
Figure 3-62 IMR Limit as Function of ILfitatNq for USB Type-C to Legacy Cable Assembly ................. 122
Figure 3-63 IRL Limit as Function of ILfitatNq for USB Type-C to Legacy Cable Assembly .................. 122
Figure 3-64 Cable Assembly Shielding Effectiveness Testing ............................................................................. 126
Figure 3-65 Shielding Effectiveness Pass/Fail Criteria .......................................................................................... 127
Figure 3-66 LLCR Measurement Diagram .................................................................................................................... 128
Figure 3-67 Temperature Measurement Point .......................................................................................................... 130
Figure 3-68 Example Current Rating Test Fixture Trace Configuration ........................................................ 131
Figure 3-69 Example of 4-Axis Continuity Test Fixture ......................................................................................... 133
Figure 3-70 Example Wrenching Strength Test Fixture for Plugs without Overmold ............................. 135
Figure 3-71 Reference Wrenching Strength Continuity Test Fixture .............................................................. 136
Figure 3-72 Example of Wrenching Strength Test Mechanical Failure Point .............................................. 136
Figure 3-73 Wrenching Strength Test with Cable in Fixture ............................................................................... 137
Figure 3-74 USB Type-C Cable Receptacle Flange Example ................................................................................. 139
Figure 3-75 EMC Guidelines for Side Latch and Mid-plate ................................................................................... 140
Figure 3-76 EMC Finger Connections to Plug Shell .................................................................................................. 140
Figure 3-77 EMC Pad Connections to Receptacle Shell .......................................................................................... 141
Figure 3-78 Examples of Connector Apertures .......................................................................................................... 141
Figure 3-79 Recommended Minimum Spacing between Connectors .............................................................. 142
Figure 3-80 Recommended Minimum Plug Overmold Clearance ..................................................................... 142
Figure 3-81 Cable Plug Overmold and an Angled Surface ..................................................................................... 143
Figure 4-1 Cable IR Drop ...................................................................................................................................................... 146
Figure 4-2 Cable IR Drop for powered cables ............................................................................................................. 146
Figure 4-3 Logical Model for Single-Lane Data Bus Routing across USB Type-C-based Ports ............ 156
Figure 4-4 Logical Model for USB Type-C-based Ports for a Single-Lane Direct Connect Device ...... 156
Figure 4-5 Pull-Up/Pull-Down CC Model ...................................................................................................................... 158
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Figure 4-6 Current Source/Pull-Down CC Model ...................................................................................................... 158
Figure 4-7 Source Functional Model for CC1 and CC2 ............................................................................................ 161
Figure 4-8 Source Functional Model Supporting USB PD PR_Swap ................................................................. 162
Figure 4-9 Sink Functional Model for CC1 and CC2 ................................................................................................. 163
Figure 4-10 Sink Functional Model Supporting USB PD PR_Swap and VCONN_Swap ................................ 164
Figure 4-11 DRP Functional Model for CC1 and CC2............................................................................................... 164
Figure 4-12 Connection State Diagram: Source ......................................................................................................... 169
Figure 4-13 Connection State Diagram: Sink .............................................................................................................. 170
Figure 4-14 Connection State Diagram: Sink with Accessory Support ........................................................... 171
Figure 4-15 Connection State Diagram: DRP .............................................................................................................. 172
Figure 4-16 Connection State Diagram: DRP with Accessory and Try.SRC Support ................................. 173
Figure 4-17 Connection State Diagram: DRP with Accessory and Try.SNK Support ................................ 174
Figure 4-18 Connection State Diagram: Charge-Through VPD ........................................................................... 175
Figure 4-19 Sink Power Sub-States ................................................................................................................................. 199
Figure 4-20 Passive Cable eMarker State Diagram .................................................................................................. 201
Figure 4-21 Active Cable eMarker State Diagram ..................................................................................................... 201
Figure 4-22 Cable Ra Management State Diagram ................................................................................................... 203
Figure 4-23 Source to Sink Functional Model ............................................................................................................ 206
Figure 4-24 Source to DRP Functional Model............................................................................................................. 207
Figure 4-25 DRP to Sink Functional Model .................................................................................................................. 208
Figure 4-26 DRP to DRP Functional Model – CASE 1 .............................................................................................. 209
Figure 4-27 DRP to DRP Functional Model – CASE 2 & 3 ...................................................................................... 210
Figure 4-28 Source to Source Functional Model ....................................................................................................... 212
Figure 4-29 Sink to Sink Functional Model .................................................................................................................. 213
Figure 4-30 DRP to VPD Model ......................................................................................................................................... 213
Figure 4-31 Example DRP to Charge-Through VCONN-Powered USB Device Model ................................. 214
Figure 4-32 Source to Legacy Device Port Functional Model .............................................................................. 222
Figure 4-33 Legacy Host Port to Sink Functional Model ....................................................................................... 223
Figure 4-34 DRP to Legacy Device Port Functional Model ................................................................................... 224
Figure 4-35 Legacy Host Port to DRP Functional Model ....................................................................................... 225
Figure 4-36 Sink Monitoring for Current in Pull-Up/Pull-Down CC Model .................................................. 229
Figure 4-37 Sink Monitoring for Current in Current Source/Pull-Down CC Model .................................. 229
Figure 4-38 USB PD over CC Pins ..................................................................................................................................... 230
Figure 4-39 USB PD BMC Signaling over CC ................................................................................................................ 230
Figure 4-40 USB Type-C Cable’s Output as a Function of Load for Non-PD-based USB Type-C Charging .............................................................................................................................................................................. 235
Figure 4-41 0 – 3 A USB PD-based Charger USB Type-C Cable’s Output as a Function of Load .......... 236
Figure 4-42 3 – 5 A USB PD-based Charger USB Type-C Cable’s Output as a Function of Load .......... 236
Figure 4-43 Electronically Marked Cable with VCONN connected through the cable ................................ 241
Figure 4-44 Electronically Marked Cable with SOP’ at both ends ..................................................................... 242
Figure 4-45 Example Charge-Through VCONN-Power USB Device Use Case ................................................. 244
Figure 4-46 DRP Timing ....................................................................................................................................................... 248
Figure 5-1 USB4 Discovery and Entry Flow Model .................................................................................................. 256
Figure 5-2 USB4 Hub with USB4 Host and Device Connection Flow Alignment ........................................ 263
Figure 5-3 USB4 Hub with USB 3.2 Host and USB4 Device Host Connection Flow ................................... 264
Figure 5-4 USB4 Hub with USB4 Host and USB 3.2 Device Connection Flow .............................................. 265
Figure 5-5 USB4 Hub with USB 3.2 Host and Device Connection Flow........................................................... 266
Figure 5-6 USB4 Hub with USB4 Host and DP Alt Mode Device Connection Flow .................................... 267
Figure 5-7 USB4 Hub with USB 3.2 Host and DP Alt Mode Device Connection Flow ............................... 268
Figure 6-1 Electronically Marked Short Active Cable with SOP’ Only ............................................................. 274
Figure 6-2 Electronically Marked Short Active Cable with SOP’ and SOP” .................................................... 274
Figure 6-3 Electronically Marked Optically Isolated Active Cable .................................................................... 275
Figure 6-4 OIAC USB PD Message Forwarding........................................................................................................... 282
Figure 6-5 OIAC Successful Data Role Swap ................................................................................................................ 285
Figure 6-6 OIAC Rejected Data Role Swap ................................................................................................................... 286
Release 2.1 - 12 - USB Type-C Cable and
May 2021 Connector Specification
Copyright © 2021 USB 3.0 Promoter Group. All rights reserved.
Figure 6-7 OIAC Wait Data Role Swap ........................................................................................................................... 286
Figure 6-8 OIAC Initiator Reject Data Role Swap ...................................................................................................... 287
Figure 6-9 OIAC Initiator Wait Data Role Swap ......................................................................................................... 288
Figure 6-10 OIAC Discovery – Phase 1........................................................................................................................... 290
Figure 6-11 OIAC Reboot – Phase 2 ................................................................................................................................ 291
Figure 6-12 OIAC Plug-A Configure as DFP – Phase 3 ............................................................................................. 292
Figure 6-13 OIAC Plug-A Configure as UFP – Phase 3 ............................................................................................. 293
Figure 6-14 OIAC Plug-A No Connection Possible Billboard – Phase 3 ........................................................... 294
Figure 6-15 OIAC Plug-A State Diagram Part 1 (Phase 1 and 2) ........................................................................ 295
Figure 6-16 OIAC Plug-A State Diagram Part 2 (Phase 3) ..................................................................................... 296
Figure 6-17 OIAC Plug-B State Diagram ........................................................................................................................ 303
Figure 6-18 Active Cable Topologies .............................................................................................................................. 313
Figure 6-19 Illustrations of Usages for OIAC That Require an Adapter or Hub .......................................... 316
Figure 6-20 SuperSpeed USB Electrical Test Points ................................................................................................ 317
Figure 6-21 SuperSpeed USB Compliance Test Setup ............................................................................................ 317
Figure 6-22 Compliance Points Definition ................................................................................................................... 320
Figure 6-23 RX Differential Return-Loss Mask .......................................................................................................... 322
Figure 6-24 Active Cable Compliance Test Setup ..................................................................................................... 322
Figure 6-25 Example for Transmitter Frequency Variation During Clock Switching .............................. 325
Figure 6-26 Active Cable Functional Test Setup ........................................................................................................ 325
Figure 6-27 Linear Re-driver-based Active Cable Compliance Setup .............................................................. 327
Figure 6-28 Gain Parameters Specified for the Linear Re-driver Active Cable ........................................... 330
Figure 6-29 OUTPUT_NOISE Limit Versus ILfitatNq ............................................................................................... 331
Figure A-1 Example Passive 3.5 mm to USB Type-C Adapter .............................................................................. 338
Figure A-2 Example 3.5 mm to USB Type-C Adapter Supporting 500 mA Charge-Through ................. 339
Figure B-1 USB Type-C Debug Accessory Layered Behavior ............................................................................... 340
Figure B-2 DTS Plug Interface ........................................................................................................................................... 341
Figure B-3 Connection State Diagram: DTS Source .................................................................................................. 342
Figure B-4 Connection State Diagram: DTS Sink ....................................................................................................... 343
Figure B-5 Connection State Diagram: DTS DRP ....................................................................................................... 344
Figure B-6 TS Sink Power Sub-States ............................................................................................................................. 349
Figure D-1 Active Cable Model (Single Port, Top Mount Receptacle) .............................................................. 365
Figure D-2 Model Architecture .......................................................................................................................................... 365
Figure D-3 Heat Sources and Heat Flow Paths ........................................................................................................... 366
Figure D-4 Vertically Stacked Horizontal Connectors 3x1 Configuration (VERT) ..................................... 368
Figure D-5 Horizontally Stacked Vertical Connectors 1x3 Configuration (HZ90) ..................................... 368
Figure D-6 Horizontally Stacked Horizontal Connector 1x3 Configuration (HORZ) ................................ 368
Figure D-7 USB 3.2 Single-Lane 3A Active Cable in a 3-Port Configuration .................................................. 369
Figure D-8 USB 3.2 Single-Lane 5A Active Cable in a 3-Port Configuration .................................................. 370
Figure D-9 Impact of Over-mold Power PO and Thermal Boundary Temperature TMB at 3 A VBUS in a Single Port Configuration ............................................................................................................................................ 371
Figure D-10 Impact of Over-mold Power PO and Thermal Boundary Temperature TMB at 5 A VBUS in a Single Port Configuration ............................................................................................................................................ 372
Figure D-11 USB 3.2 Active Cable Dongle Design (One End Shown) ............................................................... 372
Figure D-12 USB 3.2 Dual-Lane 3A Active Cable in a 3-Port Configuration .................................................. 373
Figure D-13 USB 3.2 Dual-Lane 5A Active Cable in a 3-Port Configuration .................................................. 374
Figure D-14 Example: Additional Heat Spreader on Receptacle in Host or Device ................................... 375
Figure D-15 Example: Heat Sinking by Chassis of Host or Device ..................................................................... 375
Figure E-1 Pins Available for Reconfiguration over the Full-Featured Cable .............................................. 377
Figure E-2 Pins Available for Reconfiguration for Direct Connect Applications ........................................ 377
Figure E-3 Alternate Mode Implementation using a USB Type-C to USB Type-C Cable .......................... 379
Figure E-4 Alternate Mode Implementation using a USB Type-C to Alternate Mode Cable or Device................................................................................................................................................................................................. 380
Figure E-5 USB DisplayPort Dock Example ................................................................................................................. 382
Figure F-1 TBT3 Discovery Flow ...................................................................................................................................... 387
Release 2.1 - 13 - USB Type-C Cable and
May 2021 Connector Specification
Copyright © 2021 USB 3.0 Promoter Group. All rights reserved.
Figure H-1 Arcing Damage to USB Type-C VBUS Contacts ..................................................................................... 403
Figure H-2 Arcing Due to Discharge................................................................................................................................ 404
Figure H-3 Arcing Prevention During Sink Discharge by Limiting Slew Rate .............................................. 406
Figure H-4 Arcing Prevention During Sink Discharge by Load Removal ....................................................... 408
TABLES
Table 2-1 Summary of power supply options ............................................................................................................... 37
Table 3-1 USB Type-C Standard Cable Assemblies ..................................................................................................... 40
Table 3-2 USB Type-C Legacy Cable Assemblies .......................................................................................................... 41
Table 3-3 USB Type-C Legacy Adapter Assemblies ..................................................................................................... 41
Table 3-4 USB Type-C Receptacle Interface Pin Assignments ............................................................................... 71
Table 3-5 USB Type-C Receptacle Interface Pin Assignments for USB 2.0-only Support .......................... 72
Table 3-6 USB Type-C Standard Cable Wire Assignments ....................................................................................... 74
Table 3-7 USB Type-C Cable Wire Assignments for Legacy Cables/Adapters ................................................ 75
Table 3-8 Reference Wire Gauges for standard USB Type-C Cable Assemblies ............................................. 76
Table 3-9 Reference Wire Gauges for USB Type-C to Legacy Cable Assemblies ............................................ 76
Table 3-10 USB Full-Featured Type-C Standard Cable Assembly Wiring ......................................................... 78
Table 3-11 USB 2.0 Type-C Standard Cable Assembly Wiring ............................................................................... 79
Table 3-12 USB Type-C to USB 3.1 Standard-A Cable Assembly Wiring ............................................................ 81
Table 3-13 USB Type-C to USB 2.0 Standard-A Cable Assembly Wiring ............................................................ 82
Table 3-14 USB Type-C to USB 3.1 Standard-B Cable Assembly Wiring ............................................................ 83
Table 3-15 USB Type-C to USB 2.0 Standard-B Cable Assembly Wiring ............................................................ 84
Table 3-16 USB Type-C to USB 2.0 Mini-B Cable Assembly Wiring ..................................................................... 85
Table 3-17 USB Type-C to USB 3.1 Micro-B Cable Assembly Wiring ................................................................... 87
Table 3-18 USB Type-C to USB 2.0 Micro-B Cable Assembly Wiring ................................................................... 88
Table 3-19 USB Type-C to USB 3.1 Standard-A Receptacle Adapter Assembly Wiring ............................... 90
Table 3-20 USB Type-C to USB 2.0 Micro-B Receptacle Adapter Assembly Wiring ...................................... 91
Table 3-21 Differential Insertion Loss Examples for TX/RX with Twisted Pair Construction ................ 92
Table 3-22 Differential Insertion Loss Examples for USB TX/RX with Coaxial Construction .................. 93
Table 3-23 Key Parameters in COM Configuration File ......................................................................................... 108
Table 3-24 Electrical Requirements for CC and SBU wires .................................................................................. 109
Table 3-25 Coupling Matrix for Low Speed Signals ................................................................................................. 110
Table 3-26 Maximum Mutual Inductance (M) between VBUS and Low Speed Signal Lines ................... 112
Table 3-27 USB D+/D− Signal Integrity Requirements for USB Type-C to USB Type-C Passive Cable Assemblies ......................................................................................................................................................................... 114
Table 3-28 USB Type-C Mated Connector Recommended Signal Integrity Characteristics (Informative) .................................................................................................................................................................... 116
Table 3-29 USB Type-C Receptacle Connector Signal Integrity Characteristics for USB4 Gen3 (Normative) ...................................................................................................................................................................... 119
Table 3-30 USB D+/D− Signal Integrity Requirements for USB Type-C to Legacy USB Cable Assemblies ......................................................................................................................................................................... 120
Table 3-31 Design Targets for USB Type-C to USB 3.1 Gen2 Legacy Cable Assemblies (Informative)................................................................................................................................................................................................. 121
Table 3-32 USB Type-C to USB 3.1 Gen2 Legacy Cable Assembly Signal Integrity Requirements (Normative) ...................................................................................................................................................................... 121
Table 3-33 USB D+/D− Signal Integrity Requirements for USB Type-C to Legacy USB Adapter Assemblies (Normative) .............................................................................................................................................. 123
Table 3-34 Design Targets for USB Type-C to USB 3.1 Standard-A Adapter Assemblies (Informative)................................................................................................................... 厉害 哎，我的英文太差了 学习了，{:37:} 好像最新的规范是要去掉3.0全部用3.2GEN X来命名，真的是搞死 Mac的接口是那个？ 不是一点两点的深奥，全是英文啊！{:4_131:}
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