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

7.3.1 AUTO_NEGOTIATE_SINK Usage Example 1

When attached to a 36W source the PD controller has RX_SOURCE_CAPS:

  • PDO1: 5V at 3A
  • PDO2: 9V at 3A
  • PDO3: 15V at 2.4A
  • PDO4: 20V at 1.8A

The PD controller has TX_SINK_CAPS set as:

  • PDO1: 5V at 3A (fixed)
  • PDO2: 20V at 3A (fixed)

The PD controller has AUTO_NEGOTIATE_SINK set as:

  • AUTO_NEGOTIATE_SINK = 0
  • AUTO_NEGOTIATE_SINK.ANSinkCapMismatchPower = 240d (60W)
  • AUTO_NEGOTIATE_SINK.AutoComputeSinkMinPower = 1
  • AUTO_NEGOTIATE_SINK.AutoComputeSinkMinVoltage = 1
  • AUTO_NEGOTIATE_SINK.AutoComputeSinkMaxVoltage = 1
  • AUTO_NEGOTIATE_SINK.NoCapabilityMismatch = x (see table below)
  • AUTO_NEGOTIATE_SINK.ANRDOPriority = y (see table below)

The settings give the following results:

  • ANSinkMinRequiredPower computed as 60 W
  • ANMaxVoltage computed as 20V
  • ANMinVoltage computed as 4.75V
Table 7-2 AUTO_NEGOTIATE_SINK Usage Example 1
AUTO_NEGOTIATE_SINKACTIVE_CONTRACT_RDO
NoCapabilityMismatchANRDOPriorityOperatingXMinMaxOperatingXObjectPositionCapability Mismatch
001.8A3.0A41
101.8A1.8A40
112.4A2.4A30