Texas Instruments TPS23851EVM-001 Manuale utente
Using the TPS23851EVM-001
User's Guide
Literature Number: SLUU492
February 2011
User's Guide
SLUU492–February 2011
Using the TPS23851EVM-001
This user guide describes setup and use of the TPS23851EVM-001.
1 Introduction
It includes connection and wiring descriptions, PC installation of the user interface, schematics and layout
information and a detailed section describing how to use the GUI.
2 Equipment Supplied
• HPA677 Backplane Board
• HPA676 PSE Controller Board
3 Equipment Required
• Computer
• Laptop Computer Power Supply or 20-VDC to 60-VDC Power Supply
• USB to Mini-USB Cable
• Valid POE Load
• National Instruments Website Download
• Texas Instrument's GUI for the TPS23851 (TPS23851 GUI Software)
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Hardware Connections
4 Hardware Connections
4.1 PCB Assemblies
The HPA677 is a backplane board. The HPA677 has two power supplies, the power-over-Ethernet ports
and the USB to I2C interface to support the HPA676. The HPA676 connects to the backplane board. The
HPA676 has the TPS23851 PSE controller and a power supply for the TPS23851. It controls port
connection to a valid PD.
Plug the HPA676 PCB assembly into the HPA677 backplane by aligning the three 10-pin connectors on
each board. See Board alignment photo, Figure 1.
Figure 1. Board Alignment
4.2 Power Supplies
Use either a laptop computer power supply or if not available, a lab power supply. No adjustment is
necessary with the laptop supply. Just plug the supply into J17.
With the lab power supply, if used, you must disconnected the output, turn on the power supply and adjust
the output voltage to 24 V +/-2 V. Adjust the supply current limit to 3 A. Connect the power supply output
to J9-1 and the supply GND to J9-2.
Connector J16 can be used to by-pass the 24-V to 54-V converter. This may be done if there is need to
vary 54 V when injecting a voltage into J16, remove any other input power at either J17 or at J9 when
using J16.
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GUI Setup
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4.3 USB Cable
Turn on the power supply first and then plug the USB connector. Green LED, D1 should turn on. Figure 2
shows the interconnect boards with power supply, USB, and POE load attachment.
Figure 2. Components and Interconnects
5 GUI Setup
1. Create a folder for the GUI and the National Instrument's download.
2. Go to National Instruments website and download and install the LabView Runtime Engine to the
new folder. Follow directions on screen. The download is free but you may be asked for a registration.
Use this link to get the runtime engine: http://joule.ni.com/nidu/cds/view/p/id/1101/lang/en. Download
LVRTE86std.exe and install.
3. Copy the attached file, TPS23851 GUI Software, to the new folder on the PC and unzip. Go to folder
TPS23851GUI and Double-click TPS23851.exe.
4. The GUI should start. Power the EVM and plug in a USB cable from computer to EVM. The green LED
at D1 will turn on.
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GUI Getting Started
6 GUI Getting Started
The I2C device address is set in the hardware for address 20h. The GUI also defaults to this address. If a
different address is needed, go to the GUI's right half of the screen's Setup Tab and enter the new I2C
address. See Figure 3.
Also in the Setup Tab screen, the 400-kHz I2C (default) is selected.
Leave the termination set to the default setting, open.
Figure 3. Interrupt/Events and Setup Tabs
Select the Configuration Tab (reference Figure 4). At the far right in the Configuration Screen, the
selections are global which means they apply to all 4 ports. At the pull down that says Manual, select
AUTO, and select the r0x12h Button just to the left of AUTO. The four columns to the left get set to
AUTO.
To the left of GLOBAL on this same screen the window allows individual set up for each output port.
Those selections are then applied using the r0x12h Button to the left of the four-port mode entries.
Detection and classification are initiated within the parameters of the mode already selected by either
global or single port selection in the same way the mode was set. Then click the r0x14h Button to
activate. Classification and detection can be set or cleared before initiation with the green CLEN and DEN
Rectangular Buttons The green LEDs turn on for good status indication.
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GUI Getting Started
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Plug in a valid PD load to any of the four left-side ports and the load will be powered. The connectors are
ordered Port 4 thru Port 1 where Port 4 is the leftmost connector. The right-side 4 connectors are not
operational but are included for expansion. Left or right is determined by facing the port connectors plug
input side.
After an operator action in the GUI, the resultant event may be checked in other GUI windows tabs such
as Events or Interrupts.Interrupt/Event Tabs are shown in the left half of Figure 3. Follow the tabs to
get to the proper window to check results.
RUN and STOP are in the upper left corner of the GUI screen. The GUI is running when the arrow is
black filled.
Reset is not active from the GUI Button. Reset can be done through the on-board push button switch.
Auto is grounded so all ports reset or power-up OFF.
Figure 4. GUI Buttons
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HPA676 Test Points
7 HPA676 Test Points
Table 1. HPA676 Test Points
TEST POINT SIGNAL NAME
TP1 PORT1_N
TP2 PORT1_P
TP3 GND
TP4 PSE_SDAI
TP5 GND
TP6 N48V_POE
TP7 PSE_SCL
TP8 PSE_SDAO
TP9 SDA
TP10 GND1
TP11 GND
TP12 GND
TP13 V3_3
TP14 N48V_POE
TP15 GND
TP16 OUT_P1
TP17 GATE_1
TP18 SEN_P1
8 HPA676 Test Point Connector
Table 2. HPA676 Test Point Connector
J4 SIGNAL NAME
1 GND
2 TSTA
3 Shutdown4
4 Shutdown2
5 Shutdown3
6 Shutdown1
7 INT
8 V3_3
7
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Switches
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9 Switches
• HPA676 - None
• HPA677 – S2 is a momentary RESET push button switch. This causes a reset to the TPS23851.
10 LEDs
• HPA677 - Green LED D1 indicates USB attach
11 Jumpers
• HPA676 - None
• HPA677 – See Table 3
Table 3. Jumper Function
JUMPER FUNCTION USER NOTES
J2 Hi / Lo speed USB input J2 1-2, HI and J2 2-3, Lo
J4 Hi / Lo speed USB output J4 2-3, HI and J21-2, Lo
J5 Manufacturing use J5 must be ON
J10 Enable USB interface J10 must be ON
J14 Manufacturing use J14 must be OFF
J18 Manufacturing use Must be position J18 1-2
12 HPA677 Test Points
Table 4. HPA677 Test Points
TEST POINT SIGNAL NAME
TP1 54-V, output-side feedback
TP2 18-V to 60-V input (positive)
TP3 18-V to 60-V input (negative)
TP4 54-V, input-side feedback
TP5 54-V output
TP6 54-V negative / GND
TP7 RESET
TP8 Computer GND
TP9 GND
TP10 SCL
TP11 3.3-V out
TP12 3.3-V, input-side feedback
TP13 SDA
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