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

20V USB-C DRP with USB PD and a battery charger

Historically, battery powered end-equipment has used either a barrel jack, coaxial cable or proprietary cable to charge the product. Moving to USB-C with USB PD enables you to both source and sink power, which then enables the conversion of a battery-powered device to a power bank. In other words, end users can both charge connected devices through USB-C and also have a device charged through the same USB-C connector. To accomplish these requirements, you would likely implement a DRP architecture with a bidirectional battery charger. Although this implementation may sound complex, it is typically a two-chip self-contained solution.

Figure 52 is a block diagram for a 20V USB DRP with USB PD design leveraging a bidirectional battery-charger IC. In this case, the battery charger charges the batteries when the end user connects a charger device. The battery charger will also provide the correct voltage on VBUS when the end user connects a device that needs charging. In this case, the USB PD controller will also communicate to the charger IC over I2C. When operating as a power source, the USB PD controller will communicate to the battery charger whether there’s a connection, what voltage to provide, and where to set the current limit. The battery charger will need to have the correct voltage to meet the tolerances of the USB PD specification, and also ensure the voltage transitions (from 5V to 20V, for example) to meet the timing requirements of the USB PD specification. Typically, if a battery charger is designed for USB PD applications, it would be designed to meet those specifications, or provide configurable settings to adjust the voltage transitions in order to tune the output for USB PD compliance.

5V source 20V sink USB PD block diagram Figure 52 5V source 20V sink USB PD block diagram

When operating as a power sink, the USB PD controller will communicate what power is available to the battery charger and enable the battery charger to start charging the battery. Figure 52 includes an additional 20V DRP power path because most battery charger ICs will require more than 10µF of capacitance on the input pin for stability. If you plan to use a charger IC that can operate with less than 10µF of capacitance, you can remove the 20V DRP power path from the system.