SLVUCV7 April   2024 TPS23881B

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 EVM Input/Output Connectors and Switches
    2. 2.2 EVM LEDs
    3. 2.3 EVM Test Points
    4. 2.4 EVM Test Jumpers
    5. 2.5 Quick Start
      1. 2.5.1 Input Power
        1. 2.5.1.1 Input Power (Labeled VPWR)
        2. 2.5.1.2 Local 3.3V (Labeled 3.3V)
        3. 2.5.1.3 External 3.3V (Labeled 3.3 V_USB)
      2. 2.5.2 PoE Port Interfaces
        1. 2.5.2.1 IEEE802.3bt 2-Pair Ports
        2. 2.5.2.2 IEEE802.3bt 4-Pair Ports
      3. 2.5.3 I2C Interfaces
        1. 2.5.3.1 USB2ANY
        2. 2.5.3.2 MSP-EXP430FR5969
      4. 2.5.4 Basic Test Setup Using Autonomous Mode
      5. 2.5.5 Basic Test Setup Using USB2ANY for I2C Interface (Auto Mode or Semi-Auto Mode Operation with I2C Monitoring)
      6. 2.5.6 Advanced Test Setup Using MSP-EX430FR5969 LaunchPad
    6. 2.6 TPS23881B1 Autonomous Operations
  9. 3Software
    1. 3.1 TPS23881B1EVM GUI Setup
      1. 3.1.1 TPS23881B1EVM GUI Installation
      2. 3.1.2 TPS23881B1EVM GUI Operation
      3. 3.1.3 MSP-EXP430FR5969 Details
        1. 3.1.3.1 Basic CCS and Terminal Setup
      4. 3.1.4 MSP430 Reference Code
        1. 3.1.4.1 Overview
        2. 3.1.4.2 Auto Mode
        3. 3.1.4.3 Semi Auto Mode
  10. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Drawings
      1. 4.2.1 Layout Guidelines
        1. 4.2.1.1 Supply Voltage Decoupling
        2. 4.2.1.2 Port Current Kelvin Sensing
        3. 4.2.1.3 Ground Plane Spacing and Isolation (GND, GND1, and EARTH Nets)
    3. 4.3 Bill of Materials
  11. 5Additional Information
    1. 5.1 Trademarks

2.6 TPS23881B1 Autonomous Operations

The TPS23881B1 supports autonomous mode, which means the TPS23881B1 can operate in standalone mode without any host control. To enable this function, a pulldown resistor is needed on AUTO pin. During power up, the resistance on the AUTO pin is measured, and the device is preconfigured according to Table 3-6 and all ports are configured with the same power application.

If the AUTO pin resistor is selected for 2-pair operation, due to the hardware configuration on the mother board, only 2-pair ports (J19, J20, J8, J7) are interoperable with PDs. If AUTO pin resistor is selected for 4-pair operation, only 4-pair ports (J21,J9) are interoperable with PDs.

Table 2-6 AUTO Pin Programming
AUTO PIN AUTONOMOUS MODE CONFIGURATION RESULTING REGISTER CONFIGURATIONS
Register 0x12h Register 0x14h Register 0x29h
Open/Floating Disabled 0x00h 0x00h 0x00h
124kΩ 2-pair 15 W 0xFFh 0xFFh 0x00h
62kΩ 2-pair 30 W 0xFFh 0xFFh 0x33h
35.7kΩ 4-pair 30 W 0xFFh 0xFFh 0xBBh
22.6kΩ 4-pair 45 W 0xFFh 0xFFh 0xCCh
15.8kΩ 4-pair 60 W 0xFFh 0xFFh 0xDDh
11kΩ 4-pair 75 W 0xFFh 0xFFh 0xEEh
7.7kΩ 4-pair 90 W 0xFFh 0xFFh 0xFFh