SLVUC36 April   2021 TPS23882B

 

  1.   Trademarks
  2. 1Description
    1. 1.1 Features
    2. 1.2 Applications
  3. 2Quick Start
    1. 2.1 Input Power
      1. 2.1.1 Input Power (Labeled VPWR)
      2. 2.1.2 Local 3.3 V (Labeled 3.3 V)
      3. 2.1.3 External 3.3 V (Labeled 3.3 V_USB)
    2. 2.2 PoE Port Interfaces
      1. 2.2.1 IEEE802.3bt 2-Pair Ports
    3. 2.3 I2C Interfaces
      1. 2.3.1 USB2ANY
      2. 2.3.2 MSP-EXP430FR5969
    4. 2.4 Basic Test Setup Using Autonomous Mode
    5. 2.5 Basic Test Setup Using USB2ANY for I2C Interface (Auto Mode or Semi-Auto Mode Operation with I2C Monitoring)
    6. 2.6 Advanced Test Setup Using MSP-EX430FR5969 LaunchPad
  4. 3General Use Features
    1. 3.1 EVM Input/Output Connectors and Switches
    2. 3.2 EVM LEDs
    3. 3.3 EVM Test Points
    4. 3.4 EVM Test Jumpers
  5. 4TPS23882B1 GUI Setup
    1. 4.1 TPS23882B1 GUI Installation
    2. 4.2 TPS23882B1GUI Operation
    3. 4.3 MSP-EXP430FR5969 Details
      1. 4.3.1 Basic CCS and Terminal Setup
    4. 4.4 MSP430 Reference Code
      1. 4.4.1 Overview
      2. 4.4.2 Auto Mode
      3. 4.4.3 Semi Auto Mode
  6. 5EVM Schematic, Layout Guidelines, PCB Assembly and Layer Plots
    1. 5.1 Schematic
    2. 5.2 Layout Guidelines
      1. 5.2.1 Supply Voltage Decoupling
      2. 5.2.2 Port Current Kelvin Sensing
      3. 5.2.3 Ground Plane Spacing and Isolation (GND, GND1, and EARTH nets)
    3. 5.3 PCB Drawings
  7. 6Bill of Materials

2.4 Basic Test Setup Using Autonomous Mode

The TPS23882B1 supports autonomous mode which means it can operate without any host control. During power up the resistance on the AUTO pin is measured and the device is pre-configured according to the jumper configuration on J5 of the daughterboard. All ports are configured with the same power level. Due to the hardware configuration on the motherboard, all 2-pair ports are interoperable with PDs. Only 2P-15W and 2P-30W are valid selections on the TPS23882B1EVM-008 as the other resistors are not populated.

To test with autonomous mode, install a jumper on the pins of J5 corresponding to the desired power level and power on the board without the USB2ANY or MSP-EXP430FR5969 connected. Figure 2-1 illustrates the basic setup using autonomous mode.

GUID-D4D294EC-ADF7-43EB-A271-BA2A0447D892-low.gifFigure 2-1 Basic Setup Using Autonomous Mode

If the EVM is powered with a jumper on J5 of the daughterboard, the device will automatically enter autonomous mode at the selected power level. If the selected power level changes, the EVM must be power cycled for the change to take effect.

Table 2-2 AUTO Pin Programming
AUTO PinAutonomous Mode ConfigurationResulting Register Configurations
Register 0x12hRegister 0x14hRegister 0x29h
Open/FloatingDisabled0x00h0x00h0x00h
124 kΩ2-pair 15 W0xFFh0xFFh0x00h
62 kΩ2-pair 30 W0xFFh0xFFh0x33h