Texas Instruments TPS2388EVM-612 User manual

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TPS2388EVM-612: PoE PSE Evaluation Module for TPS2388
User's Guide
SLUUBQ7–August 2017
TPS2388EVM-612: PoE PSE Evaluation Module for
TPS2388
This user’s guide describes the TPS2388 evaluation module (TPS2388EVM-612 or EVM). The EVM
contains evaluation and reference circuitry for the TPS2388. The TPS2388 is a Power-over-Ethernet
(PoE) device for power sourcing equipment (PSE).
Contents
1 Description.................................................................................................................... 2
2 Quick Start.................................................................................................................... 2
3 General Use Features....................................................................................................... 6
4 TPS2388EVM-612 Host Setup............................................................................................. 8
5 EVM Schematic, Layout Guidelines and PCB Assembly, Layer Plots.............................................. 12
6 Bill of Materials ............................................................................................................. 21
List of Figures
1 Basic Setup Using USB2ANY ............................................................................................. 4
2 Advanced Setup Using LaunchPad™ .................................................................................... 5
3 Hit 'S' to Start................................................................................................................. 9
4 Program Started ............................................................................................................. 9
5 Terminal Response With Connected Ports............................................................................. 10
6 Semi-Auto Mode Reference Code Structure .......................................................................... 11
7 Virtual Auto Mode Reference Code Structure ......................................................................... 12
8 TPS2388EVM-612 (Motherboard) Schematic: Control................................................................ 13
9 TPS2388EVM-612 (Motherboard) Schematic: Power Ports.......................................................... 14
10 TPS2388EVM-016 (Daughterboard) Schematic ....................................................................... 15
11 TPS2388EVM-612 (Motherboard) Top Side Assembly ............................................................... 16
12 TPS2388EVM-612 (Motherboard) Top Side Routing.................................................................. 17
13 TPS2388EVM-612 (Motherboard) Layer 2 Routing ................................................................... 17
14 TPS2388EVM-612 (Motherboard) Layer 3 Routing ................................................................... 18
15 TPS2388EVM-612 (Motherboard) Bottom Side Routing.............................................................. 18
16 TPS2388EVM-016 (Daughterboard) Top Side Assembly ............................................................ 19
17 TPS2388EVM-016 (Daughterboard) Top Side Routing............................................................... 19
18 TPS2388EVM-016 (Daughterboard) Bottom Side Routing........................................................... 20
19 TPS2388EVM-016 (Daughterboard) Bottom Side Assembly......................................................... 20
List of Tables
1 TPS2388EVM-612 Voltage Rail Current Requirements ............................................................... 3
2 EVM Input/Output Connectors............................................................................................. 6
3 EVM LEDs.................................................................................................................... 6
4 EVM Test Points............................................................................................................. 7
5 EVM Jumpers ............................................................................................................... 7
6 TPS2388EVM-612 Bill of Materials ..................................................................................... 21
7 TPS2388EVM-016 Bill of Materials...................................................................................... 23

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Trademarks
LaunchPad, Code Composer Studio are trademarks of Texas Instruments.
All other trademarks are the property of their respective owners.
1 Description
The TPS2388EVM-612 features the octal channel, TPS2388, IEEE 802.3at PoE PSE controller. The EVM
consists of a motherboard (TPS2388EVM-612) and daughter board (TPS2388EVM-016) containing one
TPS2388 device. The TPS2388EVM-612 provides a multi-port base platform interface for TPS2388EVM-
016, MSP-EXP430G2 (LaunchPad™), and USB2ANY (USB Interface Adapter).
1.1 Features
• Eight IEEE802.3at, Type 2 (30 W) ports with 1000BASE-T (gigabit Ethernet data pass through)
• Two non-standard, high power ports with 1000BASE-T (gigabit Ethernet data pass through)
• 100% passed Sifos compliance test
• Single DC power supply input
• On board 3.3-V regulator
• On board I2C interface to both TPS2388PW devices from either USB2ANY or MSP-EXP430G2.
• Port ON status LEDs
• User test points
1.2 Applications
• Ethernet switches and routers
• Surveillance VDRs
• High power PoE
• PoE pass-through systems
2 Quick Start
2.1 Input Power
2.1.1 Input Power (Labeled VPWR)
DC input voltage is provided through J1 (screw jack). A dc power supply 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 and is used for port VBUS as well as for the TPS2388
device. The VPWR connections to the PoE ports are not fused. Each two pair port is capable of furnishing
at least 30 W and each four pair port can furnish 60 W.
The minimum PSE port voltage is 44 VDC for type 1 and 50 V for type 2. The nominal dc voltage at
VPWR is 48 VDC for a type 1 and 54 VDC for a type 2. During evaluation, choose the appropriate dc
power supply for the type 1 or type 2 environment.

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2.1.2 Local 3.3 V (Labeled 3.3V)
Local 3.3 V for local devices (labeled as 3.3V) 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 48 V, the TPS2388 requires 3.3 V for the digital circuitry and this is routed up to TPS2388EVM-
016 over the connector interface.
2.1.3 External 3.3 V (Labeled 3.3V_USB)
The TPS2388EVM-612 provides galvanic isolation between PoE power side and host side using digital
isolators (ISO7241CD). The host side power is provided either from J2 (from USB2ANY) or J5 (from
LaunchPad). The current consumption is 6-mA typical, and 12-mA maximum.
CAUTION
Do not use USB2ANY and LaunchPad simultaneously.
Table 1. TPS2388EVM-612 Voltage Rail Current Requirements
Voltage Rail Typical (mA) Maximum (mA)
3.3V_USB 2.5 3
3.3V 25 30
VPWR (Miscellaneous) 35 57
VPWR (8x Type 1 Output Ports) 2992 3142
VPWR (8x Type 2 Output Ports) 5160 5418
VPWR Total (8x Type 1 Ports) 3027 3202
VPWR Total (8x Type 2 Ports) 5195 5478
2.2 PoE Port Interfaces
Configure the TPS2388 device with the host in order to get operational. Control the TPS2388 device
through the GUI or an external MCU. The host must configure the TPS2388 and send power on command
after a valid PD is connected to the port.
2.2.1 Standard 30 W, IEEE802.3 at Type 2 Ports
Four standard ports are provided at J19, J20, J8, and J7 for two-pair ports 1, 2, 3, and 4, respectively. The
power furnished is according to alternative A with MDI-X polarity.
2.2.2 Nonstandard 60-W Ports
Two non-standard, four-pair ports (J21 and J9) are provided. J21 is four pair port 1 and J9 is four pair port
2. The power furnished is according to alternative A with MDI-X polarity and alternative B on a single port
connector. A PD which can process power on all of the Ethernet conductors (refer to Dual TPS2378 PD
for 51-W High-Power Four-Pair PoE ) can power on and consume up to 60 W. A single PD can be
powered as well with proper operations (the Semi-Auto Mode reference code has the capability to power
on both single PD and dual PD). The Virtual Auto Mode reference code disables these high power ports
completely, since it is intended for use on IEEE802.3at compliant (2-pair) ports only.
2.3 I2C Interfaces
The EVM provides two I2C interfaces to the TPS2388.
2.3.1 USB2ANY
J2 provides an interface with the USB2ANY adapter when using a PC and GUI.

TPS23754EVM-420
Power
Supply
J7
J1
J21
J9
TPS2388EVM-016
(+)
(-)
J8
J20 J19
D1
J2
USB2ANY
TPS2388EVM-612
USB CABLE
PC
Positive Negative
Ribbon
Cable
Ethernet
Cable
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2.3.2 MSP-EXP430G2
J3, J4, and J5 provide an interface with the MSP-EXP430G2 or LaunchPad when using a PC to develop
custom power management code.
2.4 Basic Test Setup Using USB2ANY for I2C Interface (Semi-Auto Mode Operation With
I2C Monitoring)
An I2C interface is provided through J2 to the TPS2388PW devices on the TPS2388EVM-016. The
USB2ANY adapter (not included) can be used with any TI GUI which uses USB2ANY to read and write
over an I2C bus.
Figure 1. Basic Setup Using USB2ANY

TPS23754EVM-420
Power
Supply
J7
J1
J21
J9
TPS2388EVM-016
(+)
(-)
J8
J20 J19
D1
J2
TPS2388EVM-612
USB CABLE
MSP-EXP430G2
PC
Positive Negative
Ethernet
Cable
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2.5 Advanced Test Setup Using MSP-EX430G2 (LaunchPad™)
The LaunchPad (not included) running a custom software program can communicate with the TPS2388
device on the TPS2388EVM-016 . Figure 2 shows the advanced setup using LaunchPad.
Figure 2. Advanced Setup Using LaunchPad™

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3 General Use Features
3.1 EVM Input/Output Connectors and Switches
Table 2 lists the EVM input and output connectors.
Table 2. EVM Input/Output Connectors
Connector or
Switch Label Description
J1 J1 DC power supply screw jack. (44–57 VDC, 5 A). Use a 48 VDC (nominal) for type 1 and 54
VDC (nominal) for type 2 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 (mates with LaunchPad J6)
J6 J6 TPS2388EVM-016 control (mates with TPS2388EVM-016 J3)
J17 J17 TPS2388EVM-016 port 5-8 (mates with TPS2388EVM-016 J2)
J18 J18 TPS2388EVM-016 port 1-4 (mates with TPS2388EVM-016 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
J24 J24 Four-pair port 1 data only
J21 4 Pair Port 1 Four-pair port 1 power and data
J12 J12 Four-pair port 2 data only
J9 4 Pair Port 2 Four-pair port 2 power and data
J29 J29 Chassis ground tie point
3.2 EVM LEDs
Table 3 lists the EVM LEDs and their descriptions.
Table 3. EVM LEDs
LED Color Label Description
D1 GREEN 48V 48-V ON indicator
D16 BLUE D16 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, D16 is active.
D17 BLUE D17 Two-pair port 2 power is ON. For J20 supplier #1 (see the BOM), J20 internal port LED is active. For
supplier #2, D17 is active.
D13 BLUE D13 Two-pair port 3 power is ON. For J8 supplier #1 (see the BOM), J8 internal port LED is active. For
supplier #2, D13 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.
D18 BLUE D18 Four-pair port 1A power is ON. For J21 supplier #1 (see the BOM), J21 internal port LED is active. For
supplier #2, D18 is active.
D14 BLUE D14 Four-pair port 2A power is ON. For J9 supplier #1 (see the BOM), J9 internal port LED is active. For
supplier #2, D14 is active.

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3.3 EVM Test Points
Table 4 lists and describes the EVM test points.
Table 4. EVM Test Points
TP Color Label Description
Motherboard: TPS2388EVM-612
TP1 RED VPWR Used for VPWR
TP2 RED 3.3V Used for TPS2388 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 TPS2388
TP7 WHT PSE_SCL I2C clock to TPS2388
TP8 WHT PSE_SDAI I2C data in to TPS2388
TP9 BLK GND1 Ground from LaunchPad and USB-TO-GPIO
TP11 SMT TP11 Chassis ground test point
TP14 SMT GND VPWR ground test point
TP15 SMT GND VPWR ground test point
TP16 SMT GND VPWR ground test point
Daughterboard: TPS2388EVM-016
TP2 RED 2P4D Two-pair port 4 DRAIN
TP3 WHT 2P4G Two-pair port 4 GATE
TP4 WHT 4P1AG Four-pair port 1A GATE
TP5 RED 4P1AD Four-pair port 1A DRAIN
TP6 RED 4P1BD Four-pair port 1B DRAIN
TP7 WHT 4P1BG Four-pair port 1B GATE
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 5, in the Default Pin Position
column. Shunts can be moved and removed, as required, during use.
(1) Remove the jumpers on the mother board when doing SIFOS or UNH DC MPS testing.
Table 5. EVM Jumpers(1)
Jumper Default Pin
Position Label Description
Motherboard: TPS2388EVM-612
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 Four-pair port 1A LED bias
J25 1-2 P6 Four-pair port 1B LED bias
J14 1-2 P7 Four-pair port 2A LED bias
J13 1-2 P8 Four-pair port 2B LED bias
Daughterboard: TPS2388EVM-016
J4 1-2;3-4;5-6;7-8 NA I2C A1-A4 address lines

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4 TPS2388EVM-612 Host Setup
4.1 MSP-EXP430G2 Setup
The TPS2388EVM-612 accepts the MSP-EXP430G2 evaluation module when the application requires
management of the TPS2388 devices with an external controller. Before inserting the MSP-EXP430G2
into the TPS2388EVM-612, make the following jumper changes and ensure that the target MSP430
(MSP430G2553) device is installed:
1. Remove the shunt on J5 in the P1.6 slot
2. Remove the shunts on J3 in the RXD and TXD slot. Re-install these in the vertical position as
described in MSP-EXP430G2 LaunchPad Development Kit
3. Install MSP-EXP430G2 onto TPS2388EVM-612 and ensure that the USB2ANY ribbon cable is not
installed into J2
4. Connect the PC to the LaunchPad as shown in Figure 2
5. The source code was developed for the MSP430 LaunchPad Development Kit (MSP-EXP430G2
http://www.ti.com/tool/msp-exp430g2) using the Code Composer Studio™ (CCS) version 7.1.0
(http://www.ti.com/tool/ccstudio-msp430) development environment. The target MSP430 can be
programmed within this environment. The reference code can be downloaded from the TPS2388
product folder on TI.com .
6. Once CCS is installed, use the basic set of instructions listed in Section 4.1.1 to import, build, and run
the project. CCS version 7.1.0 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.
4.1.1 Basic CCS and Terminal Setup
1. Launch the CCS program on the PC: Start →Texas Instruments →Code Composer Studio 7.1.0 →
Code Composer Studio 7.1.0
2. OK the workspace location and CCS starts
3. Import the project: File →Import Existing CCS Eclipse Project
4. Navigate to the project location, then click the Finish button
5. Set the active project: Project, Build Configurations, Set Active, Virtual-Auto, or Semi-Auto
6. Build the project by clicking the hammer symbol
7. Launch debug session from CCS to activate the current project: Run, Debug (or F11).
8. Run the active project: Run, Resume (or play button, F8)
9. Determine the PC COM port connected to the LaunchPad by going into the Device Manager Ports
(COM and LPT) section. Launch the terminal program.
10. Once the terminal program is properly connected to the LaunchPad running the POE firmware, then
text similar to Figure 3 appears (If it does not appear at first, try to close Tera Term and reopen).

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Figure 3. Hit 'S' to Start
11. Pressing the “S” key on the keyboard starts the program
Figure 4. Program Started
12. The TPS2388EVM-612 is now waiting for a PD load to be installed. As ports are installed, the
firmware automatically detects, classifies, and powers up the port as shown in Figure 5. Port status is
updated on the screen approximately every 10 seconds.

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Figure 5. Terminal Response With Connected Ports
13. In similar fashion, the builds for Virtual Auto Mode operation can be configured and launched. The
terminal welcome screen indicates which build is running on the LaunchPad.
4.2 MSP430 Reference Code
4.2.1 Overview
There is a MSP40 reference code offered under the TPS2388 product folder on TI.com for basic
applications. Customers can download the code for free and develop their own system software starting
from here.
The system software supports the following features:
• Fully compliant to IEEE802.3at PoE specification
• Virtual Auto-Mode operation
• Device detection and classification
• DC disconnect
• Faults reporting
4.2.2 Semi-Auto Mode Reference code
The reference code can support PSE systems with up to 48 ports. It keeps track of all system level
parameters as well as port level parameters for each TPS2388 device within the system.
The main actions are interrupts triggered. As long as the MSP430 receives an interrupt signal from
TPS2388 devices, it checks the interrupt status and proceeds with related actions.
The system software also keeps track of system and devices error conditions that occur, as well as any
events that affect the port states. The MSP430 communicates with the PC through UART, reporting
parameters and status of the port.