Texas Instruments TPS23882EVM User manual

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TPS23882EVM: PoE, PSE, TPS23882 Evaluation Module
User's Guide
SLVUBQ3–August 2019
TPS23882EVM: PoE, PSE, TPS23882 Evaluation Module
This user’s guide describes the evaluation modules (EVM) for the TPS23882 (TPS23882EVM-008 and
BOOST-PSEMTHR8-097). The EVM contains evaluation and reference circuitry for the TPS23882. The
TPS23882 is a Power-over-Ethernet (PoE) device for power sourcing equipment (PSE).
Contents
1 Description.................................................................................................................... 2
2 Quick Start.................................................................................................................... 2
3 General Use Features....................................................................................................... 7
4 TPS23882 GUI Setup....................................................................................................... 9
5 EVM Schematic, Layout Guidelines, PCB Assembly and Layer Plots.............................................. 17
6 Bill of Materials ............................................................................................................. 26
List of Figures
1 Basic Setup Using Autonomous Mode.................................................................................... 4
2 Basic Setup Using USB2ANY ............................................................................................. 5
3 Advanced Setup Using LaunchPad™ .................................................................................... 6
4 TPS23882 GUI Startup Window ......................................................................................... 10
5 TPS23882 GUI Load Firmware 1 ........................................................................................ 11
6 TPS23882 GUI Load Firmware 2 ........................................................................................ 11
7 Device Configuration and Port Telemetry Page ....................................................................... 12
8 Register Map ............................................................................................................... 13
9 Semi-Auto UART Transmission Startup................................................................................. 14
10 Semi-Auto UART Transmission Status.................................................................................. 15
11 Auto Mode System Software Structure.................................................................................. 16
12 Semi Auto Mode System Software Structure........................................................................... 17
13 BOOST-PSEMTHR8-097 (Motherboard) Schematic: Control........................................................ 18
14 BOOST-PSEMTHR8-097 (Motherboard) Schematic: Power Ports.................................................. 19
15 TPS23882EVM-008 (Daughterboard) Schematic...................................................................... 20
16 BOOST-PSEMTHR8-097 (Motherboard) Top Side Assembly ....................................................... 21
17 BOOST-PSEMTHR8-097 (Motherboard) Top Side Routing.......................................................... 22
18 BOOST-PSEMTHR8-097 (Motherboard) Layer 2 Routing ........................................................... 22
19 BOOST-PSEMTHR8-097 (Motherboard) Layer 3 Routing ........................................................... 23
20 BOOST-PSEMTHR8-097 (Motherboard) Bottom Side Routing...................................................... 23
21 TPS23882EVM-008 (Daughterboard) Top Side Assembly........................................................... 24
22 TPS23882EVM-008 (Daughterboard) Top Side Routing ............................................................. 24
23 TPS23882EVM-008 (Daughterboard) Bottom Side Routing ......................................................... 24
24 TPS23882EVM-008 (Daughterboard) Bottom Side Assembly ....................................................... 25
List of Tables
1 TPS23882 Voltage Rail Current Requirements ......................................................................... 3
2 AUTO Pin Programming.................................................................................................... 4
3 EVM Input/Output Connectors............................................................................................. 7
4 EVM LEDs.................................................................................................................... 7

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5 EVM Test Points............................................................................................................. 8
6 EVM Jumpers ............................................................................................................... 8
7 BOOST-PSEMTHR8-097 Bill of Materials ............................................................................. 26
8 TPS23882EVM-008 Bill of Material...................................................................................... 28
Trademarks
LaunchPad, Code Composer Studio are trademarks of Texas Instruments.
All other trademarks are the property of their respective owners.
1 Description
The TPS23882 features the TPS23882: an 8-channel, IEEE802.3bt compliant PoE PSE controller. The
EVM consists of a motherboard (BOOST-PSEMTHR8-097) and a daughterboard (TPS23882EVM-008)
containing one TPS23882 device. The TPS23882 EVM provides a multi-port base platform interface for
TPS23882EVM-008, MSP-EXP430FR5969 (LaunchPad™), and USB2ANY (USB Interface Adapter).
1.1 Features
The EVM supports the following features:
• Eight IEEE802.3bt 2-pair ports with 1000BASE-T (gigabit Ethernet data pass-through)
• Single DC power supply input
• Onboard 3.3-V regulator
• Onboard I2C interface to the TPS23882 device from either USB2ANY or MSP-EXP430FR5969.
• Port ON status LEDs
• Reset button for easy reconfiguration
• User test points
1.2 Applications
The EVM is used in the following applications:
• Enterprise and SoHO switches and routers
• Connected ceiling LED switches
• PoE pass-through power modules
• Network video recorders (NVRs)
• Wireless backhaul and small-cell networking
2 Quick Start
2.1 Input Power
2.1.1 Input Power (Labeled VPWR)
The DC input voltage is provided through J1 on the mother board(screw jack). A DC power supply or wall
adapter with sufficient current capacity can power the EVM.
CAUTION
Reverse voltage protection is not provided; ensure that the correct polarity is
applied to J1.
This DC input is labeled VPWR in the schematics, is used for port VBUS and for the TPS23882 devices.
The VPWR connections to the PoE ports are not fused. Each two-pair port is capable of furnishing at least
30 W.

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The minimum PSE port voltage is 44 VDC for type 1 and 50 V for type 2 and type 3. During evaluation,
choose the appropriate DC power supply for different environments.
2.1.2 Local 3.3 V (Labeled 3.3 V)
Local 3.3 V for local devices (labeled as 3.3 V) is provided by the onboard LM5019 buck converter. The
LM5019 provides a basic power-on sequence and provides a well-controlled and consistent startup. In
addition to 54 V, the TPS23882 requires 3.3 V for the digital circuitry and this is routed up to
TPS23882EVM-008 over the connector interface. The current consumption is 6-mA typical and 12-mA
maximum.
2.1.3 External 3.3 V (Labeled 3.3 V_USB)
The BOOST-PSEMTHR8-097 provides galvanic isolation between the PoE power side and host side
using digital isolators (ISO7241CD). The host side power is provided either from J2 of the mother board
(from USB2ANY) or J5 of the mother board (from MSP-EXP430FR5969).
CAUTION
Do not use USB2ANY and LaunchPad simultaneously.
Table 1. TPS23882 Voltage Rail Current Requirements
Voltage Rail Typical (mA) Maximum (mA)
3.3 V_USB 2.5 3
3.3 V 6 12
VPWR (Miscellaneous) 35 57
VPWR (8 × 2 Pair Ports) 4800 5455
VPWR Total (8 × 2 Pair Ports) 4835 5512
2.2 PoE Port Interfaces
The TPS23882 device must be configured through the host to become operational. This EVM provides 2
ways to control the TPS23882: TPS238x EVM GUI (with USB2ANY) and Basic Reference Code (with
MSP-EXP430FR5969 LaunchPad).
2.2.1 IEEE802.3bt 2-Pair Ports
Eight 2-pair ports are provided at J19, J20, J8, J7, J32, J33, J21, and J9 of the mother board for 2-pair
ports 1, 2, 3, 4, 5, 6, 7, and 8 respectively. The power furnished is according to alternative A with MDI-X
polarity.
2.3 I2C Interfaces
Two I2C interfaces to the TPS23882 are provided on the EVM.
2.3.1 USB2ANY
J2 of the mother board provides an interface with the USB2ANY adapter when using a PC and GUI.
2.3.2 MSP-EXP430FR5969
J3, J4, and J5 of the mother board provide an interface with the MSP-EXP430FR5969 when using a PC to
develop custom system software.

TPS2373-4EVM-758
Class 3-4
Power
Supply
J7
J1
32
J33
TPS23882EVM-008
(+)
(±)
J8
J20
J19
D1
J2
BOOST-PSEMTHR-097
J21
J9
Positive Negative
Ethernet
Cable
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2.4 Basic Test Setup Using Autonomous Mode
The TPS23882 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 daughter board. All ports are configured with the same power level. Due
to the hardware configuration on the mother board, all 2-pair ports are interoperable with PDs. Only 2P-
15W and 2P-30W are valid selections on the TPS23882EVM-008 as the other resistors are not populated.
In order 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 1
illustrates the basic setup using autonomous mode.
Figure 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. AUTO Pin Programming
AUTO Pin Autonomous Mode
Configuration Resulting Register Configurations
Register 0x12h Register 0x14h Register 0x29h
Open/Floating Disabled 0x00h 0x00h 0x00h
124 kΩ2-pair 15 W 0xFFh 0xFFh 0x00h
62 kΩ2-pair 30 W 0xFFh 0xFFh 0x33h

TPS2373-4EVM-758
Class 3-4
Positive
Power
Supply
J7
J1
32
J33
TPS23882EVM-008
(+)
(í)
J8
J20
J19
D1
J2
USB2ANY
BOOST-PSEMTHR-097
Ribbon
Cable
xxx
xxx
xx
xx
xx
xxx
xxx
xxx
xx
xx
xxx
xxx
PC USB CABLE
Ethernet
Cable
J21
J9
Negative
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2.5 Basic Test Setup Using USB2ANY for I2C Interface (Auto Mode or Semi-Auto Mode
Operation with I2C Monitoring)
An I2C interface is provided through J2 of the mother board to the TPS23882 device on the
TPS23882EVM-008. The USB2ANY adapter (not included) can be used with any TI GUI which uses
USB2ANY to read and write over an I2C bus. Figure 2 illustrates the basic setup using USB2ANY.
Figure 2. Basic Setup Using USB2ANY
CAUTION
If wanting to run TPS23882 in semi auto mode, remove the jumper installed on
J5 of the TPS23882 daughter board before powering on the board.

TPS2373-4EVM-758
Class 3-4
Power
Supply
J7
J1
J32 J33
TPS23882EVM-008
(+)
J8
J20
J19
D1
J2
BOOST-PSEMTHR-097
xx
xx
x
x
x
xxx
xxx
xxx
xx
xx
xxx
xxx
xxx
PC
USB CABLE
MSP-
EXP430FR5969
J21
J9
(í)
Ethernet
Cable
Positive
Negative
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2.6 Advanced Test Setup Using MSP-EX430FR5969 LaunchPad™
The LaunchPad (not included) running a custom software program can communicate with the TPS23882
devices on the TPS23882EVM-008. Figure 3 shows the advanced setup using LaunchPad.
Figure 3. Advanced Setup Using LaunchPad™
CAUTION
If wanting to run TPS23882 in semi auto mode, remove the jumper installed on
J5 of the TPS23882 daughter board before powering on the board.
CAUTION
Do not press the RESET button (S1) on the motherboard while communicating
over I2C. Pressing this button will set all ports to off mode and the reference
code will not be able to recover.

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3 General Use Features
3.1 EVM Input/Output Connectors and Switches
Table 3 lists the EVM input and output connectors on the mother board.
Table 3. EVM Input/Output Connectors
Connector or
Switch Label Description
S1 RESET Button to send a hardware reset signal to the TPS23882
J1 J1 DC power supply screw jack. (44–57 VDC). Use a 48 VDC (nominal) for type 1 and 54 VDC
(nominal) for type 2, 3, and 4 PSE operation.
J2 J2 Ribbon cable connection to USB2ANY adapter
J3 J3 LaunchPad control (mates with LaunchPad J1)
J4 J4 LaunchPad I2C (mates with LaunchPad J2)
J5 J5 LaunchPad power (onboard, mates with LaunchPad J6)
J6 J6 TPS23882EVM-008 control (mates with TPS23882EVM-008 J3)
J17 J17 TPS23882EVM-008 Channel 5–8 (mates with TPS23882EVM-008 J2)
J18 J18 TPS23882EVM-008 Channel 1–4 (mates with TPS23882EVM-008 J1)
J22 J22 Two-pair port 1 data only
J19 2 Pair Port 1 Two-pair port 1 power and data
J23 J23 Two-pair port 2 data only
J20 2 Pair Port 2 Two-pair port 2 power and data
J11 J11 Two-pair port 3 data only
J8 2 Pair Port 3 Two-pair port 3 power and data
J10 J10 Two-pair port 4 data only
J7 2 Pair Port 4 Two-pair port 4 power and data
J31 J31 Two-pair port 5 data only
J32 2 Pair Port 5 Two-pair port 5 power and data
J30 J30 Two-pair port 6 data only
J33 2 Pair Port 6 Two-pair port 6 power and data
J24 J24 Two-pair port 7 data only
J21 2 Pair Port 7 Two-pair port 7 power and data
J12 J12 Two-pair port 8 data only
J9 2 Pair Port 8 Two-pair port 8 power and data
J29 J29 Chassis ground tie point
3.2 EVM LEDs
Table 4 lists the mother board LEDs and their descriptions.
Table 4. EVM LEDs
LED Color Label Description
D1 GREEN 48 V 48-V ON indicator
D13 BLUE D13 Two-pair port 1 power is ON. For J19 supplier #1 (see the bill of materials (BOM)), J19 internal port
LED is active. For supplier #2, D13 is active.
D15 BLUE D15 Two-pair port 2 power is ON. For J20 supplier #1 (see the BOM), J20 internal port LED is active. For
supplier #2, D15 is active.
D14 BLUE D14 Two-pair port 3 power is ON. For J8 supplier #1 (see the BOM), J8 internal port LED is active. For
supplier #2, D14 is active.
D12 BLUE D12 Two-pair port 4 power is ON. For J7 supplier #1 (see the BOM), J7 internal port LED is active. For
supplier #2, D12 is active.

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Table 4. EVM LEDs (continued)
LED Color Label Description
D19 BLUE D19 Two-pair port 5 power is ON. For J32 supplier #1 (see the BOM), J32internal port LED is active. For
supplier #2, D19 is active.
D18 BLUE D18 Two-pair port 6 power is ON. For J33 supplier #1 (see the BOM), J33 internal port LED is active. For
supplier #2, D18 is active.
D17 BLUE D17 Two-pair port 7 power is ON. For J21 supplier #1 (see the BOM), J21 internal port LED is active. For
supplier #2, D17 is active.
D16 BLUE D16 Two-pair port 8 power is ON. For J9 supplier #1 (see the BOM), J9 internal port LED is active. For
supplier #2, D16 is active.
D3 GREEN D3 Debug LED
3.3 EVM Test Points
Table 5 lists and describes the EVM test points.
Table 5. EVM Test Points
TP Color Label Description
Motherboard: BOOST-PSEMTHR8-097
TP1 RED VPWR Used for VPWR
TP2 RED 3.3 V Used for TPS23882 VDD
TP3 SMT GND VPWR ground
TP4 WHT SDA I2C Data from LaunchPad and USB-TO-GPIO
TP5 WHT SCL I2C Clock from LaunchPad and USB-TO-GPIO
TP6 WHT PSE_SDAO I2C data out from TPS23882
TP7 WHT PSE_SCL I2C clock to TPS23882
TP8 WHT PSE_SDAI I2C data in to TPS23882
TP9 BLK GND1 Ground from LaunchPad and USB2ANY
TP10 SMT GND VPWR ground test point
TP11 SMT TP11 VPWR ground test point
TP12 SMT GND VPWR ground test point
TP13 SMT GND VPWR ground test point
Daughterboard: TPS23882EVM-008
TP2 RED 2P4D Two-pair port 4 DRAIN
TP3 WHT 2P4G Two-pair port 4 GATE
TP4 WHT 2P5G Two-pair port 5 GATE
TP5 RED 2P5D Two-pair port 5 DRAIN
TP7 WHT 2P6G Two-pair port 6 GATE
TP6 RED 2P6D Two-pair port 6 DRAIN
TP1 BLK GND VPWR ground
TP8 SMT GND VPWR ground
3.4 EVM Test Jumpers
The EVM is equipped with shunts on the jumper positions identified in Table 6, in the Default Pin Position
column. Shunts can be moved and removed, as required, during use.
Table 6. EVM Jumpers
Jumper Default Pin
Position Label Description
Motherboard: BOOST-PSEMTHR8-097

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Table 6. EVM Jumpers (continued)
Jumper Default Pin
Position Label Description
J27 1-2 P1 Two-pair port 1 LED bias
J28 1-2 P2 Two-pair port 2 LED bias
J16 1-2 P3 Two-pair port 3 LED bias
J15 1-2 P4 Two-pair port 4 LED bias
J26 1-2 P5 Two-pair port 5 LED bias
J25 1-2 P6 Two-pair port 6 LED bias
J14 1-2 P7 Two-pair port 7 LED bias
J13 1-2 P8 Two-pair port 8 LED bias
Daughterboard: TPS23882EVM-008
J4 1-2;3-4;5-6;7-8 A1;A2;A3;A
4I2C A1-A4 address lines
J5 3-4 2P-30W AUTO pin selection (autonomous mode is enabled if
connecting auto pin to ground with selected resistance, 2-pair
30W operation is selected by default)
4 TPS23882 GUI Setup
4.1 TPS23882 GUI Installation
TI's TPS23882 GUI is used with the TPS23882 to control the port and provide real-time feedback on port
telemetry. Download the TPS23882 GUI from the TPS23882 product folder page in the Tools and
software section.
Follow the onscreen instructions to complete the installation. The TPS23882 GUI uses the USB2ANY as
an interface between the PC USB port and the BOOST-PSEMTHR8-097 J2 connector (I2C interface).
Before starting the TPS23882 GUI, make sure the USB2ANY is properly connected to TPS23882 and the
EVM is supplied with a 44- to 57-V power supply as shown in Figure 2.
4.2 TPS23882GUI Operation
Start the TPS23882 GUI by double clicking the GUI icon. A window similar to Figure 4 will come up.

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Figure 4. TPS23882 GUI Startup Window
The default device address in the GUI is set to 0x20 which matches the default configuration of the EVM
(J4 on the daughter card is installed with jumpers). The GUI sets the TPS23882 in configuration B mode
(see the GENERAL MASK Register section of the data sheet for details). The address can be programed
through the A1 to A4 pins and the I2C address setting in the GUI needs to match the hardware
configuration. See the Pin Status Register section of the data sheet for details. The startup page contains
links to the EVM user's guide, TPS23882 data sheet, E2E forum and MSP430 reference code. Four
popular PD end-equipment images are connected to the PSE switch. Links to the recommended PD
device for each end equipment are also provided.
Once the TPS23882 device is connected, click Firmware to select firmware to be loaded to TPS23882.

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Figure 5. TPS23882 GUI Load Firmware 1
Figure 6. TPS23882 GUI Load Firmware 2

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Once firmware is successfully loaded and Device Connected displays and port configuration type is
selected , click Engineering View.
On the page displayed in Figure 7, each port can be configured separately by clicking each RJ45
connector. By default, the TPS23882 is configured in OFF Mode. Each port can be configured by clicking
the RJ45 icon. Clicking the SET ALL PORTS TO STANDARD button sets all port to standard
configurations (configuring ports in Semi-Auto mode, enabling OSS, power policing, and DC disconnect).
Clicking the SET ALL PORTS TO AUTO MODE button enables Auto Mode for all ports.
The status of each port is shown on the configuration and telemetry page. The configuration of the ports
can also be edited on this page by clicking the RJ45 connector.
If the port is configured in Auto Mode, the port will turn on automatically by the PSE device after
connecting a valid PD. If not configured in Auto Mode, a port enable command is required. The port can
be turned on only when the PD has valid detection and classification results.
Figure 7. Device Configuration and Port Telemetry Page
The GUI also provides access to every register of the device in the register map.

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Figure 8. Register Map

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4.3 MSP-EXP430FR5969 Details
The TPS23882 accepts the MSP-EXP430FR5969 evaluation module when the application requires
management of the TPS23882 devices with an external controller.
1. Install MSP-EXP430FR5969 onto BOOST-PSEMTHR8-097 and ensure that the USB2ANY ribbon
cable is NOT installed into J2.
2. Connect the PC to the LaunchPad as shown in Figure 3.
3. The source code was developed for the MSP430 LaunchPad Development Kit (MSP-
EXP430GFR5969) using the Code Composer Studio™ (CCS) version 7.2.0 development environment.
The target MSP430 can be programmed within this environment.
4. Once CCS is installed, use the basic set of instructions listed in Section 4.3.1 to import, build, and run
the project. CCS version 7.2.0 is used in the following examples. Note that a terminal program such as
HyperTerminal or Teraterm is required to view the output from the EVM when it is running.
4.3.1 Basic CCS and Terminal Setup
Use the following steps for basic CCS and terminal setup:
1. Launch the CCS program on the PC: Start →Texas Instruments →Code Composer Studio 7.2.0 →
Code Composer Studio 7.2.0.
2. OK the workspace location and CCS starts.
3. Import the project: Project→Import CCS Projects (make sure you are in CCS Edit mode).
4. Navigate to the project location, then click the Finish button.
5. Build the project by clicking the hammer symbol. Semi-Auto or Auto mode can be switched selected
using the drop-down arrow to the right of the hammer symbol.
6. Launch the debug session from CCS to activate the current project: Run, Debug (or F11).
7. Run the active project: Run, Resume (or play button, F8).
8. Determine the PC COM port connected to the LaunchPad by going into the Device Manager Ports
(COM and LPT) section. Launch the terminal program.
9. Once the terminal program is properly connected to the LaunchPad running the PoE firmware, then
text similar to the following image appears.
Figure 9. Semi-Auto UART Transmission Startup

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10. The TPS23882 is now waiting for a PD load to be installed. As ports are installed, the system
automatically detects, classifies, and powers up the port as shown in Figure 10. Port status is updated
on the screen approximately every 10 seconds.
Figure 10. Semi-Auto UART Transmission Status

Start
Load SRAM Code
Initialize
MSP430
(GPIO, I2C, UART)
Configure interrupts
See ports to Auto mode
Enable DC Disconnect
Configure 2 pair mode for
Each RJ45 port
Power off all ports
(QDEOHDOOSRUWV¶GHWHFWLRQ
& classification
Every 10
seconds
Print input voltage,
temp, and telemetry
via UART
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4.4 MSP430 Reference Code
4.4.1 Overview
There is MSP430 reference code for basic applications published on ti.com. This reference code will
be discussed in the following sections.
The system software supports the following features:
• IEEE802.3bt PoE specification
• Device detection, connection check, and classification
• Automatic power on (standard 2-pair PDs)
• DC disconnect
• Port telemetry updates
The MSP430 communicates with the PC through UART, reporting the parameter and status of the
port.
4.4.2 Auto Mode
Auto mode operation is demonstrated in the MSP430 reference code and Figure 11 shows the flow chart.
Basically, after configuration, the TPS23882 handles port detection, classification, turn on, and faults by
itself and there is no control needed from the host.
Figure 11. Auto Mode System Software Structure

Initialize
MSP430
Set Power Off to all ports.
Set Ports to SEMI_AUTO mode
Configure Interrupts, Remapping,
OSS,etc.
Start
Every 10 seconds
Print input voltage, temp, and port
telemetry via UART
Disconnection Event
Get Disconnect
Status
Determine port(s)
Classification Event
Get Classification
Status
Determine port(s)
Power On Port/
PPM
Classification Valid?
Print Status
Fault Event
Get Fault Status
Determine port(s)
Print Status
(QDEOH3RUWV¶GHWHFWLRQ&
classification
Load SRAM Code
Yes
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4.4.3 Semi Auto Mode
Operation, the semi auto mode reference code is interrupt based. When MSP430 receives an interrupt
from PSE's INT pin, the code checks interrupt the register and event registers to proceed with actions
accordingly. The flowchart of semi auto mode code is shown in Figure 12.
Figure 12. Semi Auto Mode System Software Structure
5 EVM Schematic, Layout Guidelines, PCB Assembly and Layer Plots
This section contains the TPS23882 schematic, layout guidelines, printed-circuit board (PCB) assembly
and layer plots.
5.1 Schematic
Figure 13 through Figure 15 illustrate the TPS23882 (daughter card+motherboard) schematics.

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Figure 13. BOOST-PSEMTHR8-097 (Motherboard) Schematic: Control

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TPS23882EVM: PoE, PSE, TPS23882 Evaluation Module
Figure 14. BOOST-PSEMTHR8-097 (Motherboard) Schematic: Power Ports

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20 SLVUBQ3–August 2019
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Copyright © 2019, Texas Instruments Incorporated
TPS23882EVM: PoE, PSE, TPS23882 Evaluation Module
Figure 15. TPS23882EVM-008 (Daughterboard) Schematic