Silicon Laboratories Si3452MS8 Manual de usuario

Si3452MS8-KIT

Si3452MS8 EVALUATION BOARD USER’SGUIDE

1. Introduction

The Si3452MS8 8-port evaluation kit (Si3452MS8-KIT) is intended for Power over Ethernet (PoE) Power Sourcing

Equipment (PSE) system designers interested in evaluating the Quad-port Si3452 PSE controller. While evaluation

kits are normally shipped with Si3452 devices that use Silicon Laboratories’ proprietary dV/dt™ disconnect, they

can also be used for evaluation of the pin-compatible Si3453, which uses dc disconnect. In this case, the Si3452

devices must be replaced with the appropriate Si3453 device. Please refer to "8. Ordering Guide" on page 35 for

more information.

The Si3452 is controlled through an I2C (or SMBus) interface. For convenience in evaluation, a graphical user

interface (GUI) is provided, giving an easy-to-use visual display and control of the Si3452 I2C registers. The

evaluation kit assumes the user has access to a PC to control the evaluation board with the provided GUI.

The user is also responsible for providing an appropriate high-voltage power supply. The power supply should be

45 to 57 V for normal PoE or 51 to 57 V for PoE+. The Si3452 can supply over 30 W to each port. Thus, the two

Si3452 controllers for the eight port demo system can provide over 240 W of total power. Normally, a 50 to 100 W

power supply is used. While the classification and actual current consumption of each port is available, the demo

GUI does not implement system-level power management. Contact Silicon Laboratories for more information about

system-level power management options.

The Si3452MS8 kit has been thoroughly tested for standards compliance and interoperability. Contact Silicon

Laboratories for test reports using Sifos PoE test equipment and University of New Hampshire PoE standards

compliance and interoperability reports.

Si3452MS8-KIT

2 Rev. 0.6

2. Kit Contents

This user’s guide includes instructions on the use of the Si3452 register control GUI. An optional Power Manager

GUI is described in the SI3452 Power Manager GUI user’s guide on the CD-ROM. The installation instructions for

the hardware and USB to I2C driver in this user’s guide must be followed before installing and using the Si3452

Power Manager GUI.

Table 1. Evaluation Kit Contents

Kit Contents

Si3452MS8-EB r1.1 The Si3452 8-port evaluation board with connector for an external 50 V power supply. The

power supply must be capable of supplying the required amount of power for all PoE loads

being connected. Standard boards are populated with Si3452-B01-GM parts.

Si3452CB-EB r1.1 An RJ-45 connector board configured as power over Ethernet Gigabit mid-span injector.

A 24-wire cable to connect the Si3452 evaluation board to the mid-span injector board

PoE USB v1.3 A USB to I2C (or SMBus) evaluation board. This board is preconfigured with updated firm-

ware to support I2C transactions.

A USB cable to connect to a host PC

Si3402ISO-EB A PD evaluation board configured to provide a Class 3 signature.

Si3402ISO-C4-EB A PD evaluation board configured to provide a Class 4 signature.

10 loads for the evaluation boards. Each load will consume 2.5 W, which is about 3 W

referred to the PSE side.

Two Ethernet cables to connect the Si3400 and Si3401 evaluation boards to the connector

board.

CD-ROM Software drivers for the USB to SMBus adapter and a GUI for the Si3452 registers on a

CD-ROM. Applicable applications notes and data sheets are also included.

Si3452MS8-KIT

Rev. 0.6 3

3. Installation

Before you can use the Si3452 Monitor, you must first install the PoEUSB device driver associated with the

PoEUSB adapter card, as well as install the Si3452 Monitor.

3.1. Installing the PoEUSB Device

If you have previously installed the PoEUSB device, uninstall the previous driver version before installing the new

version. To uninstall the previous version, select “Programs and Features” or “Add or Remove Programs” from the

Control Panel, and then uninstall “Windows Driver Package - Silicon Labs…”.

Figure 1. Uninstall Previous Rev Windows Driver Package

To install the PoEUSB device driver, run PoEUSBSetup_v1.1.exe.

Figure 2. PoE USB Device Installer Screen

After the PoEUSB device driver is installed, then complete the installation by connecting the PoEUSB adapter card

to the PC with a USB cable.

Si3452MS8-KIT

4 Rev. 0.6

3.2. Installing the Si3452 Monitor

If you have previously installed the Si3452 Monitor, uninstall the previous version before installing the new version.

To uninstall the previous version, select “Programs and Features” or “Add or Remove Programs” from the Control

Panel, and then uninstall "Si3452 Monitor".

Figure 3. Uninstall Previous Rev Si3452 Monitor

To install the Si3452 Monitor, run Si3452MonitorSetup_v2.0.exe.

Figure 4. Monitor Setup Wizard

Si3452MS8-KIT

Rev. 0.6 5

4. Hardware Installation

Figure 5 shows how all the hardware pieces of the Si3452 evaluation board fit together.

Figure 5. Evaluation Board Hardware

Si3452MS8-KIT

6 Rev. 0.6

Perform the following steps:

1. Connect the Si3452 evaluation card (Si3452MB8-EVB) to the RJ45 (Si3452C3-EVB) card using the 24-pin

ribbon cable.

2. Plug J104 of the PoEUSB adapter into J104 of the Si3452 evaluation card.

3. The high-voltage power supply should be connected to the evaluation system before it is plugged into the ac

mains. Hot insertion of the high voltage is not recommended. Be careful about the polarity of the high-voltage

power supply. After the high voltage supply is turned on, the power LED D101 will glow, indicating that the 3.3 V

supply is active.

Figure 6. Location of D101 which Indicated Power Has Been Properly Applied

4. Plug the PoEUSB adapter into the computer USB cable if this was not already done during the software

installation step. Connect the USB side before connecting the PoEUSB side. If the drivers were installed

properly, the PC should recognize the adapter.

5. Plug in powered devices. The evaluation board is configured as a midspan power injector. The data input lines

are on the top row, and the power plus data output lines are on the bottom row.

Figure 7. Connector Board Configuration

6. Start the Si3452 Monitor.

Port 1

Data in

Port 1

PoE and

Data out

Port 8

Data in

Port 8

PoE and Data out

Si3452MS8-KIT

Rev. 0.6 7

5. Using the Si3452 Monitor

To run the Si3452 Monitor, double click on the "Si3452 Monitor" desktop icon. You may also run the Si3452 Monitor

from the Start menu, by selecting: Start All Programs Silicon Laboratories Si3452 Monitor.

The Si3452 Monitor initially displays the basic graphical user interface (GUI), but it can be switched to the

advanced GUI by clicking on the “Advanced GUI” button.

5.1. Basic GUI

The basic GUI provides high level status, configuration, and control of Si3452 port controllers.

Figure 8. Basic GUI

The basic GUI contains the following:

Monitor Control

Interface Selector

Device Information

Device Status

Port Boxes

Si3452MS8-KIT

8 Rev. 0.6

5.1.1. Monitor Control

The primary purpose of the Monitor Control area is to configure and control the operation of the GUI itself.

Figure 9. Monitor Control Area

The user may manually update the GUI by clicking the “Refresh” button. The GUI reads the Si3452 registers and

updates the displayed information.

The user may cause the GUI to automatically update itself at regular intervals by clicking on the “Start polling”

button. The green LED flashes red each time an update occurs. The “Poll delay” text box allows the user to specify

the time between updates. The user may stop automatic updates by clicking on the “Stop polling” button.

The user selects which Si3452 controller to use with the “Slave addr” box. Several Si3452 controllers may be

connected to the I2C bus, and each controller has a unique I2C slave address. The “Slave addr” box specifies

which of the Si3452 controllers to communicate with. The GUI works with only one Si3452 at a time, but the user

may dynamically switch the GUI between several Si3452s with the “Slave addr” box.

If the user checks the “CoR” (Clear on Read) check box, then the GUI reads the Si3452's CoR registers when

updating. If the CoR check box is not checked, then the GUI does not read the CoR registers when updating. The

CoR registers are the Port Event registers and the Device Status register. Reading a CoR register has side effects.

Reading a Port Event register clears that register and clears a port event bit in the interrupt register. Reading the

Device Status register clears a device event bit in the interrupt register. Consequently, if the CoR check box is

checked while the GUI is polling, then events could come and go without being noticed by the user.

If the user checks the “RoM” (Read on Modify) check box, then the GUI automatically updates itself after the user

modifies the GUI. The GUI automatically shows the effect of any change within a time delay, specified by the “RoM

delay” text box. The RoM behavior is only useful if polling is stopped.

The Monitor Control area has three buttons. The “Reset Device” button resets the Si3452 by writing the “reset chip”

command to the command register. The “Shutdown low priority ports” button turns off all low priority ports by writing

the “shutdown all low priority ports” command to the command register. The “Advanced GUI” button displays the

advanced GUI controls.

5.1.2. Interface Selector

The Interface Selector specifies which USB-to-I2C device to use for communicating with the Si3452 port

controllers.

Figure 10. Interface Selector

Si3452MS8-KIT

Rev. 0.6 9

The Si3452 Monitor supports several different USB-to-I2C devices. If more than one of these devices is connected

to the PC at the same time, then the user can select which one to use with the Interface drop-down box.

The “Dummy” device is a substitute device that does not actually perform I2C communications. The Dummy device

allows the Si3452 Monitor to open even if there are no USB-to-I2C devices connected to the PC.

The version of the Si3452 Monitor is displayed at the bottom of the window.

5.1.3. Device Information

The Device Information box displays high level information about the Si3452 device.

Figure 11. Device Information Box

This box displays the hardware revision of the silicon, the firmware version, and the measured Vee voltage. The

user can update the Vee voltage by clicking on the “Vee” button.

5.1.4. Device Status

The Device Status box displays the high level status of the Si3452 device.

Figure 12. Device Status Box

This box displays the contents of the Device Status register. If the temperature of the Si3452 controller is too high,

then the “Over temp” LED bar is bright red instead of dark red. If the Vee voltage is too low, then the “Vee UVLO”

LED bar is bright red instead of dark red. This box also displays the setting of the detection back-off timing

(Alternative A or Alternative B).

The user may manually update this box by clicking on the “R” (read) button. The GUI reads the Device Status

“Refresh” button unless the CoR check box is checked.

If a device event bit is set in the interrupt register, then the “R” button is red. This indicates that the displayed device

status is stale and that the Device Status register should be read. Reading the Device Status register has the side

effect of clearing the device event bits in the interrupt register, consequently making the “R” button no longer red.

The “Toggle detection back-off timing” button switches the detection back-off timing between Alternative A and

Alternative B. This change may not automatically be displayed in this box. The user may have to click on the “R”

button to see the new timing setting. If the Device Status register has never been read, then this box displays

“Alternative?” because the timing is not known.

Si3452MS8-KIT

10 Rev. 0.6

5.1.5. Port Boxes

The port boxes display port status and have controls for configuring and controlling the ports.

Figure 13. Port Box

5.1.5.1. Port Status

A port box displays the results of the last detection and last classification in the middle of the right pane. The

PwrEnable LED (bottom left) is bright red if the port is turned on. The PwrGood LED is bright red if the measured

port voltage is good.

The amount of current drawn from the port is displayed at the bottom right corner of the port box. The user may

manually update the port current reading by clicking on the “R” (read) button.

5.1.5.2. Port Configuration

A port box contains four radio buttons to configure the mode of the port. The port mode may be Shutdown, Manual,

Semi-auto, or Auto.

The port features can be configured with the four checkboxes on the right pane. If “Disconnect enable” is checked,

the port removes power if the powered device is unplugged. If “PoE+” is checked, then the port supplies high

power to a powered device that follows to the PoE+ protocol. If “Low priority” is checked, the port immediately

removes power if the “Shutdown low priority ports” button is clicked. If “Legacy enable” is checked, then the port

supplies power to a legacy powered device even though the powered device does not provide a valid detection

resistance. The “Legacy enable” check box is disabled if the Si3452 controller does not support this feature.

The user may configure a port's Icut level with the “Icut (mA)” drop-down box. The port automatically removes

power if the port current is greater than the Icut level for more than 60 milliseconds.

5.1.5.3. Port Control

A port box contains three buttons for controlling a port. The “On” button forces a port to supply power; the “Off”

button forces a port to remove power, and the “Reset” button resets a port.

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