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首页"2022年7月最新PD协议:最大功率240W(48V 5A)"
"2022年7月最新PD协议:最大功率240W(48V 5A)"
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更新于2024-03-13
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USB Power Delivery Specification Revision 3.1, Version 1.5, the latest version released in July 2022, sets the maximum power at 240W (48V 5A) for devices that comply with the PD protocol. This updated version of the specification aims to provide more efficient and faster charging capabilities for a wide range of devices, including smartphones, laptops, and tablets.
The PD protocol allows for power negotiation between devices, enabling them to communicate and determine the optimal power delivery for charging. With the maximum power increased to 240W, devices can now charge at higher speeds and support more power-hungry applications.
The Universal Serial Bus Power Delivery Specification outlines the technical requirements and guidelines for implementing the PD protocol in devices. It ensures interoperability and compatibility between different devices and chargers, providing a seamless charging experience for users.
The limited copyright license grants by the USB 3.0 promoters allows for the use of the specification under certain conditions. This license ensures that the specifications are used in accordance with the guidelines set forth by the USB 3.0 promoters, promoting standardization and consistency in the implementation of the PD protocol.
Overall, the USB Power Delivery Specification Revision 3.1, Version 1.5 represents a significant advancement in charging technology, offering higher power delivery capabilities and improved efficiency. As more devices adopt the PD protocol, users can expect faster charging speeds and increased convenience in powering their devices. The latest version of the specification sets the stage for future developments in charging technology, paving the way for even more innovative and powerful devices in the years to come.
Page 16 USB Power Delivery Specification Revision 3.1, Version 1.5
6.7.3 Hard Reset Counter ...................................................................................................................................................... 233
6.7.4 Capabilities Counter ..................................................................................................................................................... 233
6.7.5 Discover Identity Counter .......................................................................................................................................... 233
6.7.6 VDMBusyCounter .......................................................................................................................................................... 233
6.7.7 Counter Values and Counters ................................................................................................................................... 233
6.8 Reset ......................................................................................................................................................................................... 234
6.8.1 Soft Reset and Protocol Error ................................................................................................................................... 234
6.8.2 Data Reset ......................................................................................................................................................................... 236
6.8.3 Hard Reset ........................................................................................................................................................................ 236
6.8.4 Cable Reset ....................................................................................................................................................................... 237
6.9 Accept, Reject and Wait .................................................................................................................................................... 237
6.10 Collision Avoidance ............................................................................................................................................................ 237
6.11 Message Discarding ........................................................................................................................................................... 238
6.12 State behavior ...................................................................................................................................................................... 239
6.12.1 Introduction to state diagrams used in Chapter 6 ........................................................................................... 239
6.12.2 State Operation ............................................................................................................................................................... 239
6.12.3 List of Protocol Layer States ..................................................................................................................................... 262
6.13 Message Applicability ....................................................................................................................................................... 264
6.13.1 Applicability of Control Messages .......................................................................................................................... 265
6.13.2 Applicability of Data Messages ................................................................................................................................ 266
6.13.3 Applicability of Extended Messages ...................................................................................................................... 267
6.13.4 Applicability of Extended Control Messages ...................................................................................................... 269
6.13.5 Applicability of Structured VDM Commands ..................................................................................................... 269
6.13.6 Applicability of Reset Signaling ............................................................................................................................... 270
6.13.7 Applicability of Fast Role Swap signal .................................................................................................................. 271
6.14 Value Parameters ................................................................................................................................................................ 272
7. Power Supply ............................................................................................................. 273
7.1 Source Requirements ........................................................................................................................................................ 273
7.1.1 Behavioral Aspects ....................................................................................................................................................... 273
7.1.2 Source Bulk Capacitance ............................................................................................................................................ 273
7.1.3 Types of Sources ............................................................................................................................................................ 273
7.1.4 Source Transitions ........................................................................................................................................................ 274
7.1.5 Response to Hard Resets ............................................................................................................................................ 283
USB Power Delivery Specification Revision 3.1, Version 1.5 Page 17
7.1.6 Changing the Output Power Capability ................................................................................................................ 284
7.1.7 Robust Source Operation ........................................................................................................................................... 284
7.1.8 Output Voltage Tolerance and Range ................................................................................................................... 286
7.1.9 Charging and Discharging the Bulk Capacitance on V
BUS
.............................................................................. 288
7.1.10 Swap Standby for Sources ......................................................................................................................................... 288
7.1.11 Source Peak Current Operation ............................................................................................................................... 288
7.1.12 Source Capabilities Extended Parameters .......................................................................................................... 290
7.1.13 Fast Role Swap ................................................................................................................................................................ 292
7.1.14 Non-application of V
BUS
Slew Rate Limits ............................................................................................................ 293
7.1.15 VCONN Power Cycle ....................................................................................................................................................... 294
7.2 Sink Requirements ............................................................................................................................................................. 295
7.2.1 Behavioral Aspects ....................................................................................................................................................... 295
7.2.2 Sink Bulk Capacitance.................................................................................................................................................. 295
7.2.3 Sink Standby .................................................................................................................................................................... 296
7.2.4 Suspend Power Consumption .................................................................................................................................. 296
7.2.5 Zero Negotiated Current ............................................................................................................................................. 296
7.2.6 Transient Load Behavior ............................................................................................................................................ 296
7.2.7 Swap Standby for Sinks ............................................................................................................................................... 297
7.2.8 Sink Peak Current Operation .................................................................................................................................... 297
7.2.9 Robust Sink Operation ................................................................................................................................................ 297
7.2.10 Fast Role Swap ................................................................................................................................................................ 299
7.3 Transitions ............................................................................................................................................................................ 300
7.3.1 Increasing the Current ................................................................................................................................................ 301
7.3.2 Increasing the Voltage ................................................................................................................................................. 303
7.3.3 Increasing the Voltage and Current ....................................................................................................................... 305
7.3.4 Increasing the Voltage and Decreasing the Current ....................................................................................... 307
7.3.5 Decreasing the Voltage and Increasing the Current ....................................................................................... 309
7.3.6 Decreasing the Current ............................................................................................................................................... 311
7.3.7 Decreasing the Voltage ................................................................................................................................................ 313
7.3.8 Decreasing the Voltage and the Current .............................................................................................................. 315
7.3.9 Sink Requested Power Role Swap .......................................................................................................................... 317
7.3.10 Source Requested Power Role Swap ..................................................................................................................... 320
7.3.11 GotoMin Current Decrease ........................................................................................................................................ 323
7.3.12 Source Initiated Hard Reset ...................................................................................................................................... 325
Page 18 USB Power Delivery Specification Revision 3.1, Version 1.5
7.3.13 Sink Initiated Hard Reset ........................................................................................................................................... 327
7.3.14 No change in Current or Voltage ............................................................................................................................. 329
7.3.15 Fast Role Swap ................................................................................................................................................................ 331
7.3.16 Increasing the Programmable Power Supply (PPS) Voltage ....................................................................... 333
7.3.17 Decreasing the Programmable Power Supply (PPS) Voltage ...................................................................... 335
7.3.18 Increasing the Adjustable Voltage Supply (AVS) Voltage ............................................................................. 337
7.3.19 Decreasing the Adjustable Voltage Supply (AVS) Voltage ............................................................................ 339
7.3.20 Changing the Source PDO or APDO ........................................................................................................................ 341
7.3.21 Increasing the Programmable Power Supply Current ................................................................................... 343
7.3.22 Decreasing the Programmable Power Supply Current .................................................................................. 345
7.3.23 Same Request Programmable Power Supply .................................................................................................... 347
7.4 Electrical Parameters ........................................................................................................................................................ 348
7.4.1 Source Electrical Parameters ................................................................................................................................... 348
7.4.2 Sink Electrical Parameters ........................................................................................................................................ 354
7.4.3 Common Electrical Parameters ............................................................................................................................... 355
8. Device Policy .............................................................................................................. 357
8.1 Overview ................................................................................................................................................................................ 357
8.2 Device Policy Manager ...................................................................................................................................................... 357
8.2.1 Capabilities ....................................................................................................................................................................... 358
8.2.2 System Policy .................................................................................................................................................................. 358
8.2.3 Control of Source/Sink ................................................................................................................................................ 359
8.2.4 Cable Detection .............................................................................................................................................................. 359
8.2.5 Managing Power Requirements .............................................................................................................................. 359
8.2.6 Use of “Unconstrained Power” bit with Batteries and AC supplies .......................................................... 361
8.2.7 Interface to the Policy Engine .................................................................................................................................. 363
8.3 Policy Engine ........................................................................................................................................................................ 365
8.3.1 Introduction ..................................................................................................................................................................... 365
8.3.2 Atomic Message Sequence Diagrams .................................................................................................................... 365
8.3.3 State Diagrams ................................................................................................................................................................ 675
9. States and Status Reporting ...................................................................................... 787
9.1 Overview ................................................................................................................................................................................ 787
9.1.1 PDUSB Device and Hub Requirements ................................................................................................................. 789
9.1.2 Mapping to USB Device States .................................................................................................................................. 789
USB Power Delivery Specification Revision 3.1, Version 1.5 Page 19
9.1.3 PD Software Stack ......................................................................................................................................................... 792
9.1.4 PDUSB Device Enumeration ..................................................................................................................................... 792
9.2 PD Specific Descriptors .................................................................................................................................................... 794
9.2.1 USB Power Delivery Capability Descriptor ......................................................................................................... 794
9.2.2 Battery Info Capability Descriptor ......................................................................................................................... 795
9.2.3 PD Consumer Port Capability Descriptor ............................................................................................................ 796
9.2.4 PD Provider Port Capability Descriptor ............................................................................................................... 797
9.3 PD Specific Requests and Events .................................................................................................................................. 798
9.3.1 PD Specific Requests .................................................................................................................................................... 798
9.4 PDUSB Hub and PDUSB Peripheral Device Requests .......................................................................................... 799
9.4.1 GetBatteryStatus ............................................................................................................................................................ 799
9.4.2 SetPDFeature ................................................................................................................................................................... 800
10. Power Rules ............................................................................................................ 802
10.1 Introduction .......................................................................................................................................................................... 802
10.2 Source Power Rules ........................................................................................................................................................... 802
10.2.1 Source Power Rule Considerations ........................................................................................................................ 802
10.2.2 Normative Voltages and Currents .......................................................................................................................... 803
10.2.3 Optional Voltages/Currents ...................................................................................................................................... 806
10.2.4 Power sharing between ports .................................................................................................................................. 812
10.3 Sink Power Rules ................................................................................................................................................................ 813
10.3.1 Sink Power Rule Considerations ............................................................................................................................. 813
10.3.2 Normative Sink Rules .................................................................................................................................................. 813
A. CRC calculation .......................................................................................................... 815
A.1 C code example .................................................................................................................................................................... 815
A.2 Table showing the full calculation over one Message ......................................................................................... 817
B. PD Message Sequence Examples ............................................................................... 818
B.1 External power is supplied downstream .................................................................................................................. 818
B.2 External power is supplied upstream ........................................................................................................................ 822
B.3 Giving back power .............................................................................................................................................................. 829
C. VDM Command Examples ......................................................................................... 841
C.1 Discover Identity Example .............................................................................................................................................. 841
C.1.1 Discover Identity Command request .................................................................................................................... 841
C.1.2 Discover Identity Command response – Active Cable.................................................................................... 841
Page 20 USB Power Delivery Specification Revision 3.1, Version 1.5
C.1.3 Discover Identity Command response – Hub. ................................................................................................... 843
C.2 Discover SVIDs Example .................................................................................................................................................. 845
C.2.1 Discover SVIDs Command request ......................................................................................................................... 845
C.2.2 Discover SVIDs Command response ...................................................................................................................... 845
C.3 Discover Modes Example ................................................................................................................................................ 847
C.3.1 Discover Modes Command request ....................................................................................................................... 847
C.3.2 Discover Modes Command response .................................................................................................................... 847
C.4 Enter Mode Example ......................................................................................................................................................... 849
C.4.1 Enter Mode Command request ................................................................................................................................ 849
C.4.2 Enter Mode Command response ............................................................................................................................. 849
C.4.3 Enter Mode Command request with additional VDO. .................................................................................... 850
C.5 Exit Mode Example ............................................................................................................................................................ 852
C.5.1 Exit Mode Command request ................................................................................................................................... 852
C.5.2 Exit Mode Command response ................................................................................................................................ 852
C.6 Attention Example .............................................................................................................................................................. 854
C.6.1 Attention Command request .................................................................................................................................... 854
C.6.2 Attention Command request with additional VDO. ......................................................................................... 854
D. BMC Receiver Design Examples ................................................................................. 856
D.1 Finite Difference Scheme ................................................................................................................................................. 856
D.1.1 Sample Circuitry ............................................................................................................................................................ 856
D.1.2 Theory ................................................................................................................................................................................ 856
D.1.3 Data Recovery ................................................................................................................................................................. 858
D.1.4 Noise Zone and Detection Zone ............................................................................................................................... 859
D.2 Subtraction Scheme ........................................................................................................................................................... 860
D.2.1 Sample Circuitry ............................................................................................................................................................ 860
D.2.2 Output of Each Circuit Block ..................................................................................................................................... 860
D.2.3 Subtractor Output at Power Source and Power Sink ..................................................................................... 860
D.2.4 Noise Zone and Detection Zone ............................................................................................................................... 861
E. FRS System Level Example ......................................................................................... 862
E.1 Overview ................................................................................................................................................................................ 862
E.2 FRS Initial Setup .................................................................................................................................................................. 864
E.3 FRS Process ........................................................................................................................................................................... 866
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