Silicon Laboratories Si3474-EVB Manual de usuario

UG425: Si3474 EVB User's Guide

Si3474 Quad 90 W Ethernet Port EVB

The Si3474 is suitable for use in either a four-port 802.3bt PSE, eight-port 802.at PSE,

or a mix of 802.3bt and 802.3at ports. The Si3474 achieves this by having two separate

quads each powering four 2-pair ports. Each quad can either be configured for two

802.3bt 4-pair ports of for four 802.3at 2-pair ports. The Si3474-EVB includes an RJ45

interface board called the POE_BT_CB to allow evaluation of the Si3474 in a mixed

802.3bt and 802.3at system.

The Si3474-EVB can power up PDs without any software installation needed. The

Si3474-EVB can be jumper-selected (J8) to automatically configure the Si3474 Port

Power Allocation. Note that when using the Si3474 in AUTO mode, the ports must either

all be in 802.3bt mode or 802.3at mode. To use the Si3474 in a mixed system, it will be

necessary to access the Si3474 registers through I2C. The Si3474-EVB allows access

to the Si3474 registers through a Silicon Labs CP2112 USB to I2C bridge. A Python in-

terface is provided to allow evaluation through Windows PC, Linux or MacOS comput-

ers.

KEY FEATURES

• IEEE 802.3bt compliant

• Up to Four 802.3bt Ports or Eight 802.3at

Ports

• AUTO Mode Jumpers

•No software needed for basic operation

• Configurable Max Port Power

•Available Direct I2C Access to Si3474

Registers

• USB Interface using Silicon Labs

CP2112 USB to I2C Bridge

• Python interface to Windows, Linux or

MacOS

Parameter Condition Specifications

PSE Input Voltage Range Connector J4 52 to 57 V

PoE Type/Class Type 4, Class 8 IEEE 802.3bt

Daughtercard Size 2.5 x 2.5 inches, 61 x 61 mm

Baseboard Size 3 x 5.35 inches, 76 x 136 mm

EVB Height Does not include headers 1.2 inch, 30 mm

silabs.com | Building a more connected world. Rev. 0.1

Table of Contents

1. Kit Description and Powering Up the Si3474 EVB ..................3

2. Software Drivers ..............................8

3. Si3474 Baseboard, Daughter Board and POE_BT_CB Board Schematics .........9

3.1 Motherboard Schematics ..........................9

3.2 Daughtercard Schematics ..........................12

3.3 Connector Board Schematic .........................16

4. Si3474 Bills of Materials ..........................17

4.1 Motherboard BOM .............................17

4.2 Daughtercard BOM ............................19

4.3 Connector Board BOM ...........................19

silabs.com | Building a more connected world. Rev. 0.1 | 2

1. Kit Description and Powering Up the Si3474 EVB

The Si3474 EVB consists of a four-layer daughter card, a four-layer baseboard and an RJ45 connector board.

The daughter card includes the Si3474, FETs and the J3 jumper. The purpose of the J3 jumper is to configure the I2C Address for

which the Si3474 responds to. Note that each Si3474 device responds to two I2C Addresses because there are two quads in every

Si3474 device.

Si347xy-MB

Baseboard

Si3474-DC

Daughter Card

POE_BT_CB

RJ45 Connector Board

Isolation

Boundary

Figure 1.1. Si3474-EVB Baseboard, Daughter Card, and RJ45 Connector Board

Figure 1.2. Si3474-EVB Daughter Card

UG425: Si3474 EVB User's Guide

Kit Description and Powering Up the Si3474 EVB

silabs.com | Building a more connected world. Rev. 0.1 | 3

Figure 1.3. J3 Configuration Header

Table 1.1. J3 I2C Address Selection Table

A4 A3 A2 A1 Quad 0

I2C Address

Quad 1

I2C Address

0 0 0 0 0x20 0x21

0 0 0 1 0x22 0x23

0 0 1 0 0x24 0x25

0 0 1 1 0x26 0x27

0 1 0 0 0x28 0x29

0 1 0 1 0x2A 0x2B

0 1 1 0 0x2C 0x2D

0 1 1 1 0x2E 0x2F

1 0 0 0 0x30 0x31

1 0 0 1 0x32 0x33

1 0 1 0 0x34 0x35

1 0 1 1 0x36 0x37

1 1 0 0 0x38 0x39

1 1 0 1 0x3A 0x3B

1 1 1 0 0x3C 0x3D

1 1 1 1 0x3E 0x3F

The Si3474 EVB base board consists of:

• Status LEDs

• Terminal Blocks for Power

•USB Connector

• AUTO Mode Selection Jumpers

The RJ45 connectors are on a separate board called the POE_BT_CB. The POE_BT_CB also has some jumpers in order to allow

configuration of the RJ45 for either 802.3bt 4-pair port usage or for 802.3at 2-pair port usage.

It is easier to describe the use cases for the USB Connector, Terminal Blocks, AUTO Mode Selection Jumpers and the POE_BT_CB

jumper connections together.

UG425: Si3474 EVB User's Guide

Kit Description and Powering Up the Si3474 EVB

silabs.com | Building a more connected world. Rev. 0.1 | 4

The following figure shows the use case where the Si3474 is used as an 802.3at PSE, without an I2C Host. The JP2 AUTO MODE SEL

in this case can be set to either Position 7 or Position 6. The corresponding selection jumpers on the POE_BT_CB will need to be set in

an alternating fashion so that the eight 802.3at ports can drive the RJ45 jacks as shown. Note that the VPWR polarity of the top-row

RJ45 jacks have an opposite polarity relative to the ports on the bottom-row RJ45. Two power supplies are needed for this configura-

tion. The +54 V provides power to PDs as well as to the Si3474 VPWR. The +5 V supply is used to supply power to the Si3474 VDD

(albeit indirectly through isolation)

+54 V

JP2 AUTO MODE SEL

JP1

EXT

+5VDC SEL

USB

+5 V

7 6 5 4 3 2 1

2pp Class 4 30 W

2pp Class 3 15 W

VOUT8

VOUT7

VOUT6

VOUT5

VOUT4

VOUT3

VOUT2

VOUT1

VOUT3

VOUT5

VOUT7

VOUT2

VOUT4

VOUT6

VOUT8

Figure 1.4. No I2C Host, Eight 802.3at 2-Pair Ports

The figure below shows the use case where the Si3474 is used as an 802.3bt PSE without an I2C Host. The JP2 AUTO MODE SEL in

this case can be set to either Position 1, 2, 3, 4, or Position 5. The corresponding selection jumpers on the POE_BT_CB will need to be

set to all "Top" positions. Four of the RJ45 jacks will be active while the other four RJ45 jacks are not connected.

Note that it is also possible to configure the jumpers to all "BOT" instead of all "TOP" (then use the bottom RJ45 jacks). When using the

bottom RJ45s, the VPWR polarity will be inverted relative to when using the top RJ45 jacks. Two power supplies are needed for this

configuration. The +54 V provides power to PDs as well as to the Si3474 VPWR. The +5 V supply is used to supply power to the

Si3474 VDD (albeit indirectly through isolation).

UG425: Si3474 EVB User's Guide

Kit Description and Powering Up the Si3474 EVB

silabs.com | Building a more connected world. Rev. 0.1 | 5

+54 V

Unused

7654321

JP2 AUTO MODE SEL

7654321

765432 1

JP1

EXT

+5VDC SEL

USB

+5 V

4pp Class 8 90W

4pp Class 7 75W

4pp Class 6 60W

76543 2 1

7 6 54 3 2 1

4pp Class 5 45W

4pp Class 4 30W

VOUT8

VOUT7

VOUT6

VOUT5

VOUT4

VOUT3

VOUT2

VOUT1

VOUT2

VOUT1

VOUT3

VOUT4

VOUT5

VOUT6

VOUT7

VOUT8

Figure 1.5. No I2C Host, Four 802.3bt 4-Pair Ports

The following figure shows the use case where the Si3474 is with an I2C Host. In this case, all JP2 AUTO MODE SEL jumpers are

removed to indicate a Hosted I2C operation mode. The selection jumpers on the POE_BT_CB will need to be set up, depending on the

expected programming of bits 4 and 7 of Register 0x29 on both quads. One power supply is needed for this configuration. The +54 V

provides power to PDs as well as to the Si3474 VPWR. The JP1 jumper is placed so that the +5 V supply is derived from USB. The 5 V

USB rail supplies power to the Si3474 VDD (albeit indirectly through isolation).

USB Type

USB Micro

Type B

+54V

JP2 AUTO MODE SEL

JP1

EXT

+5VDC SEL

USB 7 6 5 4 3 2 1 Hosted

VOUT8

VOUT7

VOUT6

VOUT5

VOUT4

VOUT3

VOUT2

VOUT1

VOUT3

VOUT5

VOUT7

VOUT2

VOUT4

VOUT6

VOUT8

I2C Addr[0] = 0

Reg 0x29[4] = 0

I2C Addr[0] = 0

Reg 0x29[7] = 0

I2C Addr[0] = 1

Reg 0x29[4] = 0

I2C Addr[0] = 1

Reg 0x29[7] = 0

I2C Addr[0] = 0

Reg 0x29[4] = 1

I2C Addr[0] = 0

Reg 0x29[7] = 1

I2C Addr[0] = 1

Reg 0x29[4] = 1

I2C Addr[0] = 1

Reg 0x29[7] = 1

Eight 802.3at

VOUT2

VOUT1

VOUT3

VOUT4

VOUT5

VOUT6

VOUT7

VOUT8

Four 802.3bt

I2C Addr[0] = 0

Reg 0x29[4] = 1

I2C Addr[0] = 0

Reg 0x29[7] = 0

I2C Addr[0] = 1

Reg 0x29[4] = 0

I2C Addr[0] = 1

Reg 0x29[7] = 1

VOUT2

VOUT1

VOUT7

VOUT8

Example Mixed

802.3at, 802.3bt

VOUT3

VOUT5

VOUT4

VOUT6

Figure 1.6. I2C Hosted

UG425: Si3474 EVB User's Guide

Kit Description and Powering Up the Si3474 EVB

silabs.com | Building a more connected world. Rev. 0.1 | 6

D9 indicates

that +5V is

present

D4 and D5 indicate

communication status

between the CP2112

and the Host PC

D7 Indicates

that the Isolated

+3.3V is present

D3 Indicates

that the Isolated

VPWR is present

Figure 1.7. Status LEDs

Figure 1.8. Buttons

UG425: Si3474 EVB User's Guide

Kit Description and Powering Up the Si3474 EVB

silabs.com | Building a more connected world. Rev. 0.1 | 7

2. Software Drivers

The Si3474-EVB has a USB port, allowing it to communicate with computer host running Windows, Linux or MacOS. The installation

guide, documentation and software are available through the following download site.

Please go to www.silabs.com/start-poe and select the Si3474-KIT link.

UG425: Si3474 EVB User's Guide

Software Drivers

silabs.com | Building a more connected world. Rev. 0.1 | 8

3. Si3474 Baseboard, Daughter Board and POE_BT_CB Board Schematics

Silicon Labs will provide a free schematic and PCB layout review. Visit www.siliconlabs.com/support to submit a support request for the

review.

3.1 Motherboard Schematics

Figure 3.1. Motherboard Isolations

UG425: Si3474 EVB User's Guide

Si3474 Baseboard, Daughter Board and POE_BT_CB Board Schematics

silabs.com | Building a more connected world. Rev. 0.1 | 9

Figure 3.2. Motherboard Top

UG425: Si3474 EVB User's Guide

Si3474 Baseboard, Daughter Board and POE_BT_CB Board Schematics

silabs.com | Building a more connected world. Rev. 0.1 | 10

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