Texas Instruments TPS2388EVM-612 Manuale utente

SLUUBQ7–August 2017

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

Description

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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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Quick Start

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TPS2388EVM-612: PoE PSE Evaluation Module for TPS2388

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

J21

TPS2388EVM-016

(+)

(-)

J20

J19

USB2ANY

TPS2388EVM-612

USB CABLE

Positive Negative

Ribbon

Cable

Ethernet

Cable

Quick Start

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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

J21

TPS2388EVM-016

(+)

(-)

J20

J19

TPS2388EVM-612

USB CABLE

MSP-EXP430G2

Positive Negative

Ethernet

Cable

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Quick Start

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TPS2388EVM-612: PoE PSE Evaluation Module for TPS2388

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™

General Use Features

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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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General Use Features

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TPS2388EVM-612: PoE PSE Evaluation Module for TPS2388

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

TPS2388EVM-612 Host Setup

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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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TPS2388EVM-612 Host Setup

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TPS2388EVM-612: PoE PSE Evaluation Module for TPS2388

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.

TPS2388EVM-612 Host Setup

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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.

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