SLYY228 November   2024

 

  1.   1
  2.   Introduction
  3.   Basics of USB Type-C®
    1.     Abstract
    2.     USB-C data speeds and power levels
    3.     Data and power roles
    4.     USB-C pinout and reversibility
    5.     USB-C cable detection and orientation
    6.     When do you need a USB PD controller?
  4.   History of USB Type-C®
    1.     Abstract
    2.     USB connector basics
    3.     USB and USB PD protocol history
    4.     USB-C vs. USB PD
    5.     Evolution of the USB PD 3.1 specification
  5.   Introduction and Overview of the USB Type-C® and USB PD Specifications
    1.     Abstract
    2.     USB-C connections
    3.     VCONN and messaging types
    4.     Negotiating USB PD power over CC wires
    5.     Data-role swaps
    6.     Power-role swaps
    7.     Introduction to USB PD alternate mode
    8.     Introduction to EPR
  6.   USB signals over USB Type-C®
    1.     Introduction
    2.     USB 2.0 Signaling Over Type-C
    3.     Low speed and full speed
    4.     High speed
    5.     Low-, full- and high-speed data rates
    6.     USB 2.0 signal integrity
    7.     SuperSpeed Signaling over USB-C
    8.     SuperSpeed startup speed negotiation
    9.     SuperSpeed signal integrity challenges
  7.   Signal Multiplexing for USB Type-C®
    1.     USB-C USB 2.0
    2.     USB-C USB 3
    3.     USB PD DisplayPort™ alternate mode multiplexing
    4.     DisplayPort source device (DFP_D) pin assignment C
    5.     DisplayPort source device (DFP_D) pin assignment D
    6.     DisplayPort source device (DFP_D) pin assignment E
    7.     DisplayPort sink device (UFP_D) pin assignment C
    8.     DisplayPort sink device (UFP_D) pin assignment D
    9.     DisplayPort sink device (UFP_D) pin assignment E
  8.   USB4
    1.     USB4 Overview
    2.     USB4 discover and entry process
    3.     USB4 System
    4.     Sideband Communication
    5.     USB4 lanes and data rates
    6.     Loss Budget
    7.     Supporting DisplayPort Alternate Mode and USB4 over SBU1 and SBU2
  9.   Introduction to eUSB2
    1.     Abstract
    2.     eUSB2 overview
    3.     eUSB2 modes
    4.     Other features
  10.   Extended Power Range (EPR)
    1.     Abstract
    2.     What is EPR?
    3.     Technical specifications
    4.     Safety implications >100W
    5.     Handling power negotiation with TI’s PD controllers
    6.     Conclusion
  11.   USB Type-C® and USB power delivery common use cases and block diagrams
    1.     5V USB-C source-only port (no USB PD)
    2.     Basic functional blocks
    3.     5V USB-C source-only port with USB 3.0 data (no USB PD)
    4.     5V USB-C sink-only port (no USB PD)
    5.     5V USB-C DRP (no USB PD)
    6.     20V USB-C source-only port with USB PD
    7.     20V USB-C sink-only port with USB PD
    8.     5V source, 20V sink USB-C port with USB PD and DisplayPort™ Alternate Mode
    9.     20V USB-C DRP with USB PD and a battery charger
  12.   End equipment-specific block diagrams
    1.     Abstract
    2.     Laptops and industrial PCs
    3.     Docking station
    4.     Bluetooth® speaker
    5.     Wi-Fi® routers and smart speakers
    6.     Power tools
  13.   Benefits of a TI PD Controller
    1.     Abstract
    2.     TI solutions to common design challenges
      1.      TI offers highly integrated solution
      2.      TI offers simple configuration tool
      3.      TI products are rigorously validated and USB-IF certified
    3.     Other benefits of using TI PD controllers
      1.      TI offers complete reference design
      2.      TI offers great customer support
      3.      Conclusion

USB-C connections

There are two configuration channel (CC) pins on USB-C connectors and cables, one for each orientation; this is what helps USB-C be reversible. The CC pins determine when a cable is connected and whether the USB-C port will assume a source or sink role; the pins also transmit and receive all USB PD messaging. Upon connection, based on the polarity, one of the CC lines is used for messaging, while the other CC line can be used for VCONN to power active cables and e-markers.

A USB-C power source will present a pullup resistor on the CC pins (Rp), while a USB-C power sink will present a pulldown resistor on the CC pins (Rd). When a source connects with a sink, Rp and Rd will form a voltage divider on the CC pin. This is how a USB-C connection is detected. In addition to the power role of the port, with standard USB-C, Rp and Rd also determine the data role. Rp is presented by the power source, which is always the downstream-facing port (DFP), while Rd is presented by the power sink, which is always the upstream facing port (UFP). After the connection is detected through the Rp and Rd resistor divider, the source must provide 5V and the sink can begin consuming current based on the implicit USB-C contract.

The resistor value of Rp will determine how much current the source can provide, as highlighted in the USB-C specification. The sink will detect the Rp resistor value through the strength of the pullup and should limit its current consumption based on the attached source’s capabilities. Note that USB-C is a cold connector, meaning that there is 0V on VBUS when nothing is connected. This is different from legacy USB Type-A, which always had 5V present on VBUS. Cold connection means that each USB-C source port will need to support enabling and disabling 5V depending on if a device is attached or not, along with controlling the current across it.

CC logic pullup and pulldown termination. (Source: USB Type-C specification v1.2, Figures 4 and 5 pullup and pulldown CC model) Figure 11 CC logic pullup and pulldown termination. (Source: USB Type-C specification v1.2, Figures 4 and 5 pullup and pulldown CC model)