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Learn more about our 802.3bt solutions: www.silabs.com/PoE

SILICON LABS LIVE

Internet Infrastructure andIndustrial Automation Tech Talks

Wednesday, June 17th Digital Isolation for Industrial Automation Equipment

Wednesday, June 24th Clock Builder Pro Tips and Tricks

Wednesday, July 1st Evolution of Isolated Gate Driver in an Energy Conscious World

Wednesday, July 8th Silicon Labs’ Latest Timing Portfolio and Reference Designs

Wednesday, July 15th Power Over Ethernet PD and PSE Solutions

Wednesday, July 22nd Discover, Evaluate and Develop with Silicon Labs’ Timing Tools

Wednesday, July 29th Digital Isolation for Safety and Reliability in Industrial Power Supplies

Wednesday, August 5th Fast and Easy Measurements with PCIe Clock Jitter Tool

Wednesday, August 12th IEEE 1588 and Silicon Lab’ Timing Modules Find Past Recorded Sessions at: https://www.silabs.com/support/training

WELCOME SILICON LABS LIVE

Internet Infrastructure andIndustrial Automation Tech Talks

Simplifying Power over EthernetJ U L Y 2 0 2 0

Powering the Future

IEEE 802.3bt Power over Ethernet (PoE) standard more than doubles PoE power

90 W PoE expands the capabilities of wireless access points and IoT gateways

Higher power also makes PoE powered 5G small cells and digital buildings a reality

Silicon Labs new 802.3bt portfolio simplifies 90 W PoE with industry leading

PSEs and PDs

4

PoE Applications

Power Sourcing Equipment (PSE)

Enterprise & SMB switches

iPBX voice switches

Lighting control systems

Inline Power Injectors/Midspans

Powered Devices (PDs)

VoIP phones

Wireless Access Points

IP security (cameras, entry systems)

Lighting/Luminaires

Silicon Labs powers both ends of the Ethernet cable from 15 to 90 W

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PoE is a great choice for when power and data are needed at a device connected to an Ethernet switch

Power and data are injected at the Source (PSE) and delivered to the PD through an Ethernet cable

PoE lowers total installation cost and simplifies wiring using standard Ethernet cables

What is PoE?

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PSE = Power Sourcing Equipment

PoE Gateway

DATA

POWER

DATA + POWER

Non-PoE Gateway

PD = Powered Device

Power Delivery in PoE Systems

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5V

EthernetSwitch

53V

53V

Four Pair Power: IEEE 802.3bt

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IEEE 802.3af/at - 2 pairsPSE: Si3462, Si3454, Si3459PD: Si3404, Si3406, Si34061

IEEE 802.3bt - 4 pairsPSE: Si3471, Si3474 - NEWPD: Si34071 - NEW

Type 1 802.3afType 2

802.3atType 3 802.3bt - NEW Type 4 802.3bt - NEW

Power Class Class 1 Class 2 Class 3 Class 4 Class 5 Class 6 Class 7 Class 8

Power from PSE 4 W 7 W 15.4 W 30 W 45 W 60 W 75 W 90 W

Power delivered to PD 3.84 W 6.49 W 13 W 25.5 W 40 W 51 W 62 W 71.3 W

Establishing PoE Connection – Type 1 (IEEE 802.3af/PoE)

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PD

Inp

ut

Vo

ltag

e

PD 25kΩValid Detecion

Detection< 500ms

V1 V2

Class 3 – 15 W

Power ON

Type I : 15W

Time

PSE/PD Communication is Analog Handshaking

Detection

PSE detects presence of valid PD device

PSE forces voltage/measures current

PD provides 25kΩ detection signature

Classification

PSE determines the Type and Class of PD

PSE forces voltage/measures current

PD provides appropriate Class current

Power ON

PSE provides full PoE voltage and power to PD

30 mAClass 3

Classification

Type 1

Establishing PoE Connection – Type 2 (IEEE 802.3at/PoE+)

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PD

Inp

ut

Vo

ltag

e

PD 25kΩValid Detecion

Detection< 500ms

V1 V2

Classification

Classification

If the PSE is Type 2, it proceeds with 2-finger classification sequence

PSE forces voltage/measures current twice, returning to the “mark voltage” between “fingers”

PD provides appropriate Class current

Power ON

PSE provides full PoE voltage and power to PD

Note: reduced valid PSE voltage range

Type II : 30W

Power ON

Time

Class 4 – 30 W

Type 1

40 mAClass 4

Type 2

Mark 1 Mark 2

Establishing PoE Connection – Type 3 and 4 (IEEE 802.3bt)

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PD

Inp

ut

Vo

ltag

e

PD 25kΩValid Detecion

Detection< 500ms

V1 V2

Type 4 : 90W

Power ON

Time

Class 8 – 90 W30 mAClass 3

Classification

40 mAClass 4

Type 2 Type 3 Type 4Type 1

Long First Class Pulse

Classification

Type 3 or 4 PSE starts with a long, first Class pulse to indicate short MPS support

PSE forces voltage/measures current four times for Type 3, five times for Type 4

PD reduces Class current draw after first two “fingers” to request Class 5-8 power

Power ON

PSE provides full PoE voltage and power to PD

Note: reduced valid PSE voltage range

Si340215 W class 3 PD

Si340415 W class 3 PD

Si340615 W, class 3 PD

Si3408xFuture 71 W, class 8 bt PD

PoE Portfolio and Roadmap

In Development

Power Sourcing Equipment (PSE)

In Production Sampling

Production

Si34621 Port PoE+

Si34598 Port PoE+

Si34544 Port PoE+

Si3474Octal Ethernet port PSE,

up to four 90 W ports

Powered Device (PD)

Si3471Single Ethernet port

90 W PSE

Si3407171 W, class 8 bt PD

Future2020

New!

New!

New!

Si3406130 W, class 4 PD

Si3462 Si3471 Si3454 Si3459 Si3474

Ethernet Ports 1 1 4 8 8

IEEE Standard, Power

802.3at30 W class 1-4

802.3bt90 W class 1-8

802.3at30 W class 1-4

802.3at30 W class 1-4

4 x 90 W class 1-8 8 x 30 W class 1-4

FeaturesExternal FETsNo host neededExternal BOM

External FETsNo host needed

External FETsAuto mode

External FETsAuto mode

External FETsAuto mode200mΩ sense

Package 3 x 3 mm QFN11 5 x 7 mm QFN38 5 x 7 mm QFN38 8 x 8 mm QFN56 8 x 8 mm QFN56

Powerful PSEs, Simple Portfolio

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Easily Add 90 W PoE to Any Ethernet Port with Si3471

Fully autonomous, single Ethernet port PSE

IEEE 802.3bt compliant, full 90 W power

Simple I/O pin power configuration

Small 38-pin, 5 x 7 mm QFN package

Industry’s first and only autonomous, single 90 W Ethernet port 802.3bt PSE!

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PoE Injector/Midspan

Fiber to Copper Ethernet Bridge

Smart Home Set-Top Box

Wireless Access Points 5G Small Cells

Si3471 Simplifies PoE Daisy Chained Systems

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IoT Wireless Gateway

PD PSESi3471

Daisy chains allow for longer network runs and simpler cablingSi3471’s small size and I/O configuration makes it easy and cost-effective

71 WPD PSE

Si347125 WPD PSE

Si347151 W

Si3471 Single Ethernet Port 802.3bt PSE

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Ethernet Port

Magnetics

External FET

Si3471

VPWR, ~53V Industry’s first fully autonomous, 90 W single Ethernet port 802.3bt PSE

Perfect for “injectors” or single port midspans

No software, no MCU, no host controller needed

Max power set pulling PWRAVL pins high or low

Very cost-effective BOM, two-layer PCB

Small 5 x 7 mm QFN package, simple BOM

2 FETs for four pair PoE power

2 current sense resistors

802.3bt PoE PSE

Controller

One 90 W Ethernet Port

Over Voltage, Over Current

Protection

Autonomous Port

Manager

External FET

PWRAVL0

PWRAVL1

PWRAVL2

LED Driver

VDD

Class 8 power configuration

Si3471 90 W PoE Midspan EVB

Tiny, two-layer daughtercard includes Si3471, FETs, and sense resistors

Less than one square inch (645 mm2) needed!

Use as cost-effective reference for customer design

Simple, two-layer baseboard includes RJ45 jacks, Ethernet magnetics, and power connectors

IEEE 802.3bt compliant

Sifos compliance test report in user guide

Ethernet Alliance certification pending

90 W, 54 V power supply included!

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Si3471-KIT$105 MSRP

Upgrade Multi-Port Systems to 90 W of Power with Si3474

Autonomous or hosted four Ethernet port 90 W PSE

IEEE 802.3bt compliant, full 90 W power

I2C power management register map

Compact 56-pin, 8 x 8 mm QFN package

Easily add up to four autonomous or hosted 90 W PoE PSE Ethernet ports!

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Industrial and Commercial Ethernet Switches

Security Recording Equipment

Si3474 Quad Ethernet Port 802.3bt PSE

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Ethernet Port

Magnetics

External FET

Si3474

VPWR, ~53V Powers up to four 90 W 802.3bt PoE Ethernet ports

Up to eight 802.3at/af PoE Ethernet ports

I2C interface with industry standard registers

Auto mode provides full power on each port

External FETs improve thermal performance

Industry standard 255 mΩ sense resistor (Si3474A)

Improve thermals with 200 mΩ sense resistor (Si3474B)

High speed flash memory

Fast boot up, no firmware download needed

Field firmware upgradable

8 x 8 mm QFN with industry standard pinout

I2C Host Interface

802.3bt PoE PSE

Controller

Auto Mode

Up to Four 90 W Ethernet Ports

Over Voltage, Over Current

Protection

High Speed Flash

External FET

Si3474 90 W PoE PSE EVB

Two-layer daughtercard includes Si3474, FETs, and sense resistors

Use as cost-effective reference for customer design

Two-layer baseboard includes Ethernet magnetics, and power connectors

Octal Ethernet port connector board

Powers up to four 90 W Ethernet ports

Powers up to eight 802.3at/af Ethernet ports

IEEE 802.3bt compliant

Sifos compliance test report in user guide

Ethernet Alliance certification pending

User provided power supply

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Si3474-KIT$199 MSRP

Si3404 Si3406 Si34061 Si34071

IEEE Standard, Power Output

802.3af/at Type 115 Watts, class 1-3

802.3af/at Type 115 Watts, class 1-3

802.3at Type 230 Watts, class 1-4

802.3bt Type 3 and 471 Watts, class 4-8

FeaturesInternal FETsIntegrated dc-dcLowest cost PD

Internal FETsIntegrated dc-dc15W, high efficiency

Internal/external FETsIntegrated dc-dc30W, high efficiency

External FETsIntegrated dc-dcHighest power PD

Package 4 x 4 mm QFN20 5 x 5 mm QFN24 5 x 5 mm QFN24 5 x 5 mm QFN32

Powerful PDs, Simple Portfolio

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Si34071 Delivers the Power of 802.3bt

Single chip 802.3bt PD solution

100% compliant PD interface

Integrated high-efficiency dc-dc controller

Small 32-pin, 5 x 5 mm QFN package

Implement 802.3bt PoE and high-efficiency dc-dc conversion with a single Si34071 IC

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Wireless Access Points

5G Small Cells

IoT Gateways

Si34071 802.3bt PD with DC-DC Controller

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EXTERNALDIODE/FET

BRIDGEExternal

Switching FET

External HSSW FET

VPOS

VNEG

EXTERNALSIGNALING

BOM

Fully IEEE 802.3bt compliant

Supports class 4-8, short MPS, and autoclass

Integrated high-efficiency dc-dc controller

15 V winding input improves thermals

Flyback and active clamp forward topologies

Switching and secondary side FET drivers

Simple, 9600 baud UART interface

System MCU reads class/power granted by PSE through UART port

UART only needs two low cost optos or Si8621

Small 5 x 5 mm QFN

DC-DC Controller

802.3bt PoE

Interface

Secondary Side FET

Si34071

Surge Protection

15V Winding Input

UART Interface

UART Data

Si34071 71 W Forward Converter EVB

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Fully IEEE 802.3bt compliant

Passes latest Sifos 802.3bt compliance tests

Si34071 dc-dc delivers high efficiency

Active clamp forward topology achieves over 90% end-to-end efficiency

Small EPD13 size transformer

Maximum 5 V, 14 A output

FET bridges reduce thermals and improve thermal performance

12 V, 6 A EVB coming soon

Si34071AC5V8KIT$119 MSRP

Simplifying PoE

Complete 90 W 802.3bt compliant PoE

Si3471 is industry’s 1st 90W auto 1 port PSE

Si3474 PSE provides up to four 90 W ports

Si34071 PD with integrated dc-dc controller

Broad 15 W to 30 W 802.3at/af solutions

Easy to use reference designs/EVBs

Cost-effective PoE for both ends of the cable from 15 W to 90 W

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Silicon Labs PoE homepage – www.silabs.com/poe

Si3471

Data sheet

Si3471-KIT

Si3474

Data sheet

Si3474-KIT

Si34071

Data sheet

AN1179: 802.3bt PD PoE interface application note

Training Portal

PDF of today’s slides including backup not presented

PoE Design Resources

Silicon Labs Confidential26

Backup

Why UART on the Si34071 PD?

802.3bt defines 8 power classes granted by the PSE

PD system must determine the power granted from the PSE and adjust power draw accordingly

Competitor parts require 3 digital pins on the PD to communicate the received class to the system

Si34071’s UART requires only two low cost opto couplers or a single Si8621 to provide the same information

Si34071 UART port register map includes

Class granted by PSE

Enable or disable MPS (low power mode)

Si34071 autoclass configuration

28

Ethernet and PoE

Input

VPOS, ~53V

Si34071

Diode Bridges

PD System

Isolated Section

VNEGEthernet Data In

Si8

62

1

MCU

UART Interface

UART Interface

Si3404 15W 802.3at PD with DC DC Controller

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EXTERNALDIODEBRIDGE

Internal Switching FET

Internal HSSW FET

Si3404

VPOS

VNEG

Internal surge protection, no TVS required

No external FETs required

Integrated 120V hot swap and dc dc FETs

No separate dc dc controller IC

Integrated dc dc controller for buck, flyback, and isolated flyback designs

Tunable switching frequency to lower EMI

15V winding input lowers power consumption

Si3404 runs off ~50V PoE input at startup and automatically switches to 15V input

1% efficiency gain

Tiny 4x4mm QFN

DC DC Controller

802.3at Type 1 PoE Interface

Surge Protection

VSS

15V Winding Input

Back to PoE PD Selection

Si3404 Buck and Isolated Flyback EVBs

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Si3404B12V3KIT - Si3404 12V Buck Class 3 EVB

3.3V, 5V, 12V, or 24V output designs

Up to 15W power

Simple, non-isolated designs

Low BOM cost

EMI compliant

PCB Area: 36 x 32 mm

Up to 15W power

Isolated output

Efficiency @5V: 83%

EMI compliant design

PCB Area: 58 x 28 mm

Si3404ISOC3EVB - Si3404 Isolated Flyback Class 3 EVB

Internal Diode Bridge

Up to 7W

Si34061 30W 802.3at PD with DC DC Controller

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EXTERNALDIODE

BRIDGE (>7W)

Internal or External

Switching FET

Internal or External HSSW FET

Si34061

VPOS

VNEG

Internal surge protection, no TVS required

No separate dc dc controller IC needed

Flyback and isolated flyback controller

Flexible

Internal FETs save space and cost

External FETs improve thermals and efficiency

Easily add support for external wall adapters

Small 5 x 5 mm QFN

DC DC Controller

802.3at Type 2 PoE Interface

Surge Protection

VSS

Adapter Input

Secondary Side FET

15V Winding Input

Si34061 5V or 12V 30W Isolated Flyback

Small EPD13 size transformer

5V, 6A output, 89.1% peak efficiency – Si34061FB5VC4KIT

12V, 2.5A output, 89.8% peak efficiency – Si34061FB12V4KIT

External wall adapter support

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