SDAA265 April   2026 TPS26750A

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Applicability to other TI USB-PD Controllers
    1. 1.1 USB-PD Sink Introduction
    2. 1.2 Autonegotiate Sink Purpose
    3. 1.3 Definitions
  5. 2Fields Covered
  6. 3Autonegotiate Sink Basics with Examples
    1. 3.1 Auto Neg RDO Priority (ANRDOPriority)
    2. 3.2 Auto Compute Sink Min Power and Auto Neg Sink Min Required Power
    3. 3.3 No Capability Mismatch and Auto Disable Sink Upon Capability Mismatch
    4. 3.4 Auto Compute Sink Min Voltage and Auto Neg Min Voltage
    5. 3.5 Auto Compute Sink Max Voltage & Auto Neg Max Voltage
  7. 4Autonegotiate Sink Basics with EPR Examples
    1. 4.1 Systems Requiring ≥140W
    2. 4.2 Sink Path SPR to EPR Transitions
  8. 5Common Mistakes or Unique System Constraints
    1. 5.1 System Needs More Power but PD Selects Lower Power PDOs
    2. 5.2 System Supports EPR Power but PD Keeps Selecting 20V PDOs
    3. 5.3 Setting the Min Voltage and Max Voltage to the Same Values
  9. 6Advanced Autonegotiate Sink Examples
    1. 6.1 Downgrading to 5V Fixed PDO
    2. 6.2 Autonegotiate Sink With Interrupt Driven EC
    3. 6.3 ANeg: Auto Negotiate Sink Update
    4. 6.4 AUTO_NEGOTIATE_SINK Register
      1. 6.4.1 AUTO_NEGOTIATE_SINK Usage Example 1
      2. 6.4.2 AUTO_NEGOTIATE_SINK Usage Example 2
      3. 6.4.3 AUTO_NEGOTIATE_SINK Usage Example 3
      4. 6.4.4 AUTO_NEGOTIATE_SINK Usage Example 4
  10. 7References

1.3 Definitions

This section reviews some keywords and definitions within this document. Definitions based on the USB Power Delivery Specification Revision 3.1 www.usb.org/developers/docs.

PD Controller/Device
Power Delivery Controller/Device		 Refers to the USB-PD capable device sending/receiving USB-PD protocol comunications
PDO
Power Data Object		 Data Object used to expose a Source Port's or Sink Port's power Capabilities as part of a Source_Capabilities/EPR_Source_Capabilities or Sink_Capabilities/EPR_Sink_Capabilities Message respectively.
RDO
Request Data Object		 Data Object the PD sink uses to request a specific PDO from the PD source
SPR
Standard Power Range		 Only the Source_Capabilities and the Request Messages are allowed to Negotiate SPR Explicit Contracts. The EPR Messages (the EPR_Source_Capabilities Message and the EPR_Request Message) are not allowed to be used while in SPR Mode. SPR range is 5V-20V going up to 100W (20V at 5A)
EPR
Extended Power Range		 Extends the power range from a maximum of 100W (SPR) to a maximum of 240W (EPR). When operating in the EPR Mode, only EPR specific Messages (the EPR_Source_Capabilities Message and the EPR_Request Message) are used to Negotiate Explicit Contracts. EPR range is 5V-48V going up to 240W (48V at 5A)
PP_EXT/PPHV_EN/PP_EN
Power Path External/Power Path High Voltage Enable/Power Path Enable		 These are generic names for the power path used in TI PD Controllers to designate the high-voltage (>5V) when the PD controller is conusming power (PD is the sink)