SPMU380 July   2026 TPS25730A

 

  1.   1
  2. 1Read This First
    1. 1.1 About This Manual
    2. 1.2 Notational Conventions
    3. 1.3 Glossary
    4. 1.4 Related Documents
    5. 1.5 Support Resources
    6. 1.6 Trademarks
  3. 2Introduction
    1. 2.1 Purpose and Scope
    2. 2.2 PD Controller Host Interface Description
      1. 2.2.1 Overview
    3. 2.3 Unique Address Interface
      1. 2.3.1 Unique Address Interface Protocol
  4. 3PD Controller Policy Modes
    1. 3.1 Overview
    2. 3.2 Sink Policy Mode
  5. 4Register Overview
    1. 4.1 TPS25730A Registers
  6. 54CC Task Detailed Descriptions
    1. 5.1 Overview
    2. 5.2 PD Message Tasks
      1. 5.2.1 'GSrC' - PD Get Source Capabilities
      2. 5.2.2 'GPPI' - PD Get Port Partner Information
      3. 5.2.3 'MBRd' - Message Buffer Read
    3. 5.3 System Tasks
      1. 5.3.1 'ANeg' - Auto Negotiate Sink Update
      2. 5.3.2 'DBfg' - Clear Dead Battery Flag
  7. 6User Reference
    1. 6.1 AUTO_NEGOTIATE_SINK Register
      1. 6.1.1 AUTO_NEGOTIATE_SINK Usage Example 1
      2. 6.1.2 AUTO_NEGOTIATE_SINK Usage Example 2
      3. 6.1.3 AUTO_NEGOTIATE_SINK Usage Example 3
      4. 6.1.4 AUTO_NEGOTIATE_SINK Usage Example 4
  8. 7Revision History

2.2.1 Overview

The PD Controller provides one I2C target. The I2Ct target is meant to be connected to an Embedded Controller (EC).

The Host Interface defines how the registers are accessed from I2C target port and target addresses. The target address is selected by the customer using the ADCIN1 and ADCIN2 pins on the PD controller.

The Host Interface provides general status information to the controller of these I2C interfaces about the PD Controller, ability to control the PD Controller, status of USB Type-C® Port and communications to/from a connected device (Port Partner) and/or cable plug through USB PD messages. All Host Interface communication that uses the Unique I2C address is referred to as Unique Address Interface.

The PD Controller supports a register-based Unique Address Interface. Section 4.1 lists the Unique Address Interface registers and provides detailed Unique Address Interface register descriptions.

The key to the protocol diagrams is in the SMBus Specification, version 2.0 and is repeated here in part in Figure 2-1.

TPS25730A I2C Read/Write Protocol Key Figure 2-1 I2C Read/Write Protocol Key