SPMU379A April   2026  – July 2026 TPS25751A

 

  1.   1
  2.   Read This First
    1.     Notational Conventions
    2.     Glossary
    3.     Related Documents
    4.     Support Resources
    5.     Trademarks
  3. 1Introduction
    1. 1.1 Purpose and Scope
  4. 2PD Controller Host Interface Description
    1. 2.1 Overview
    2. 2.2 Register and Field Notation
  5. 3Unique Address Interface
    1. 3.1 Unique Address Interface Protocol
  6. 4PD Controller Policy Modes
    1. 4.1 Overview
    2. 4.2 Source Policy Mode
    3. 4.3 Sink Policy Mode
  7. 5Register Overview
    1. 5.1 TPS25751A Registers
  8. 64CC Task Detailed Descriptions
    1. 6.1 Overview
    2. 6.2 CPU Control Tasks
      1. 6.2.1 'Gaid' - Return to Normal Operation
      2. 6.2.2 'GAID' - Cold Reset Request
    3. 6.3 PD Message Tasks
      1. 6.3.1 'SWSk' - PD PR_Swap to Sink
      2. 6.3.2 'SWSr' - PD PR_Swap to Source
      3. 6.3.3 'SWDF' - PD DR_Swap to DFP
      4. 6.3.4 'SWUF' - PD DR_Swap to UFP
      5. 6.3.5 'GSkC' - PD Get Sink Capabilities
      6. 6.3.6 'GSrC' - PD Get Source Capabilities
      7. 6.3.7 'SSrC' - PD Send Source Capabilities
      8. 6.3.8 'GPPI' - PD Get Port Partner Information
      9. 6.3.9 'MBRd' - Message Buffer Read
    4. 6.4 Power Switch Tasks
      1. 6.4.1 'SRDY' - System Ready to Sink Power
      2. 6.4.2 'SRYR' - SRDY reset
    5. 6.5 Patch Bundle Update Tasks
      1. 6.5.1 'PBMs' - Start Patch Burst Mode Download Sequence
      2. 6.5.2 'PBMc' - Patch Burst Mode Download Complete
      3. 6.5.3 'PBMe' - End Patch Burst Mode Download Sequence
      4. 6.5.4 'GO2P' - Go to Patch Mode
      5. 6.5.5 'FLrd' - Flash Memory Read
      6. 6.5.6 'FLad' - Flash Memory Write Start Address
      7. 6.5.7 'FLwd' - Flash Memory Write
      8. 6.5.8 'FLvy' - Flash Memory Verify
    6. 6.6 System Tasks
      1. 6.6.1 'ANeg' - Auto Negotiate Sink Update
      2. 6.6.2 'DBfg' - Clear Dead Battery Flag
      3. 6.6.3 'I2Cr' - I2C Read Transaction
      4. 6.6.4 'I2Cw' - I2C Write Transaction
      5. 6.6.5 'GPsh' - set GPIO high
      6. 6.6.6 'GPsl' - set GPIO low
  9. 7User Reference
    1. 7.1 PD Controller Application Customization
    2. 7.2 Loading a Patch Bundle
    3. 7.3 AUTO_NEGOTIATE_SINK Register
      1. 7.3.1 AUTO_NEGOTIATE_SINK Usage Example 1
      2. 7.3.2 AUTO_NEGOTIATE_SINK Usage Example 2
      3. 7.3.3 AUTO_NEGOTIATE_SINK Usage Example 3
      4. 7.3.4 AUTO_NEGOTIATE_SINK Usage Example 4
    4. 7.4 Liquid Detection Registers
    5. 7.5 GPIO Events
  10. 8Revision History

6.6.3 'I2Cr' - I2C Read Transaction

Table 6-25 'I2Cr' - Executes I2C Read Transaction on I2Cc
DescriptionThe 'I2Cr' task can be used to cause the PD controller to read from a specified target address and register offset using a I2C read transaction through the I2Cc_SDA and I2Cc_SCL pins.
INPUT DATAXBitNameDescription
Byte 3: Number of bytes to read from the target.
7:0NumBytes
Byte 2: Register offset to use in the I2C read transaction.
7:0RegisterOffset
Byte 1: Target Address
7Reserved
6:0Target to use for the transaction.
OUTPUT DATAXBitNameDescription
Bytes 2-65: Data Bytes read from the target (in order received)
511:0Data
Byte 1: Standard Task Return Code. See also Table 6-1.
Task CompletionThe PD controller completes after it has successfully read the specified number of bytes, or the I2C transaction terminated for some other reason.
Side EffectsThis task causes the PD controller to issue a command on the I2Cc port. It can result in INT_EVENTx.I2CControllerNACKed being asserted.
Additional InformationNone