Power Over Ethernet(POE)

Distributor TrainingMarch 2004

SecurityCamera

PointOf Sale Entry Point

Security

PalmPilots

Printers/Laptops

Market Landscape

Consumer SecurityLAN

DigitalCamera

IP PhoneWired/WirelessRouter

Cou

pler

Vol

ume

Wireless802.11

OtherConsumerHUB

CellPhone

Timing2005 200620042003

Implementations

•Stand Alone, Power Sourcing Equipment (PSE) PoE, runs largely autonomously from the router.

•Implements control through an isolated serial interface

•Application requires 4 High Speed Analog channels 200kB-1Mb.

•Very easy to implement for customers, no development cost.

•Lower performance and more expensive

•Integrated PSE PoE, where the router controller monitors the power control chips in real time

•Implements control through an isolated I2C communications bus100-400kb/s.

•Application requires 3-4 channels of high speed coupler 1Mb-10Mb.

•Low speed coupler required for application specific signaling (interrupts and alarms etc.)

•Powered Device (PD) PoE, includes DC/DC converter applications and power sensing and switching.

Stand Alone Application

NEC

NEC

NEC

802.3af

PSE Chip

802.3af

PD Chip

48V AC/DC Power

DC/DC Power

Router/ Switch

controllerPowered Device

I2C Bus

Data

µCPU

RS2

32/4

85

Tran

scei

ver

Stand Alone Implementation

•PoE functions controlled by autonomous controller.

•Real time control difficult.

•Development costs low for end customer.

•Production cost higher due to extra components

•Lower speed Opto’s required 200kB-1Mb.

NEC

NEC High Speed Coupler PS88xx, PS98xx, PS81xx, PS91xx

Low Speed Coupler PS27xxA, PS28xxA

Serial Interface runs at 119kb/s in most cases

Data + Power

Data

Isolation between Distributed Power

and Powered Device (Optional)

Isolation between Router and

Distributed Power

Integrated Application

NEC

NEC

NEC NEC

802.3af

PSE Chip

802.3af

PD Chip

48V AC/DC Power

DC/DC Power

Router/ Switch

controllerPowered Device

I2C Bus

Data Data

Data + Power

Isolation between Router and Distributed

Power

Isolation between Distributed Power and

Powered Device (Optional)

Direct Control Implementation

•Router Directly controls PoE chip.

•Real time control possible.

•Individual reset of lines possible

•Development costs high

•Production cost low

•High speed opto’s required 1Mb-10Mb

NEC

NEC

Low Speed Coupler, PS27xxA , PS28xxA

I2C interface runs at 400kb/s in most cases.

High Speed Coupler PS88xx, PS98xxPS81xx, PS91xx

Isolation in PoE

I2C interface Data and Clock. High speed Digital dual or single.

Status/Interrupt can use single transistor coupler.

On the Power Sourcing side the logic Interface must be isolated. This includes the I2C bus, Serial interfaces, and status lines.

I2C interface Data and Clock. High speed Analog dual or single.

Standard DC/DC converter application. Feedback.

On the Powered Device side, the controller chip does not require isolation. The powered device may require isolated DC/DC depending on application.

Relative Speeds of Couplers

Speed Comparison of Couplers

1.E+03 1.E+04 1.E+05 1.E+06 1.E+07 1.E+08

Darlington Transistor

Single Transistor

Photo Diode - Transistor

High Voltage O.C.

High Speed IC

High Speed CMOS

Speed (b/Sec)

Different styles of coupler cover a wide range of data rates, from a few kHz to 10MHz and beyond. The application dictates the coupler to use.

NEC Basic Coupler Types

GaAs LEDDarlington TransistorGaAs LED

Photo- TransistorGaAs LED PIN/Transistor

Single Transistor Darlington Transistor PIN + Transistor

10Mb/s Totem Pole Output

25Mb/s CMOS Output10Mb/s OC Output

NEC Coupler Part Numbering SystemNUMBERING SYSTEM (All devices are available in lead free versions)

P S X X X X X - X - X - X - X

25 = 4 to 16 pin DIP Multi Type

27 = 4 to 16 pin SOP (Pin pitch 2.54 mm)

28 = 4 or 16 SSOP (Pin pitch 1.27 mm)

29 = 4 MiniFlat (Pin pitch 1.27 mm)

86 = 8 pin DIP (Analog output)

96 = 8 pin DIP (Digital output)

81 = SOP5 (Analog output)

91 = SOP5 (Digital output)

98 = SO8 (Digital output)

Identification number

Lead Finish

None = Standard Finish

A = Lead (Pb) Free Finish

CTR Rank

Taping

E3, E4

F3, F4

1 = 1-channel type

2 = 2-channel type

4 = 4-channel type

Lead bending type

L

L1

L2

Transistor Coupler Packaging

SSOP

SOP

DIPPS25xx, PS26xx,

PS86xx, PS96xx

5000Vrms isolation,

Lead Bend for extra Creepage

PS27xx

PS28xx,PS87xx, PS97xx

3750Vrms Isolation

7.0±

0.3

2.7±0.3

5.0±

0.2

2.5±0.3

7.0±

0.3

4.5 MAX

7.62

5.1 MAX

2500Vrms Isolation 2000Vrms Miniquads

44.2 mm2

31.5 mm2

18.9 mm2

Coupler Properties

2500Vrms IsolationPS291xMiniFlat12.5 mm2

PoE Demands on Transistor Couplers

Power Supplies•Small Size

•High Bandwidth

•High Temperature Operation

•Tight CTR ranking

Vcc1 Vcc2

RLRf

IILIC

IF

Digital Data Transmission PoE status and interrupt•Low cost

•High CTR

•High Isolation

•Tight CTR ranking

PoE / Single Transistor

GaAs LEDPhoto- Transistor

SSOPSOPDIP MiniFlat

PS2501A70V/30mA/10µs

PS2701A70V/30mA/10µs

PS2801A70V/30mA/10µs

Optimized for If=5mA Low Cost

Optimized for If=1mANormal Performance

DC/DC PD

PS2703120V/30mA/5µs

PS2913120V/30mA/5µs

High SpeedHigh Performance DC/DC

PS2513120V/30mA/5µs

PS250380V/30mA/30µs

PS271140V/40mA/5µs

PS281140V/40mA/5µs

PS291140V/40mA/10µs

Ranked Couplers

M LP

M P

LDistribution spread can be minimized to group CTR in 2:1 range.

Centroid can be moved by controlling Hfe

•Tight distributions

•No extra cost to rank

High Speed Bus Communications Bus

Serial Xciever

Serial Bus Interface•Small Size•200-1000kb/S optimize for cost•Flexible Voltage range 3.3-5V•Digital Compatibility

Controller

PoE controller

IC

I2C Bus Interface•Small Size•100-400kb/S •Flexible Voltage range 3.3-5V•Digital Compatibility

Controller

PoE / High Speed Transistor

SOP5DIP8

PS8101

PS8601

PS8602

Base Pin out 1Mb/S

High CMRR1Mb/S

High CMRR200kb/S

PS8103

PS8802-1PS8802-2

R

R

GaAs LED PIN/Transistor

SO8 Single/Dual

Analog couplers can be used when low power or 3.3V operation is required. The I2C bus runs at 400kb/s

peak. Serial interfaces typically run at 119kb/s.

PoE / IC Coupler Line-up

SO8 Single/DualSOP5DIP8

PS9113PS9613

PS9114

1Mb/sPower Supply to 35V

PS9614 PS9814-1PS9814-2 R10Mb/s

5V O.C. Output

PS9821-1PS9821-2

DS Avail Now

PS9121 DS Avail Now

R R10Mb/s3.3V O.C. Output

Digital couplers are used in I2C and serial bus applications where simplicity and robustness of design are required. Most designs are using 3.3V couplers like the PS9x21.

3.3V digital couplers can also be used at 5V!

Agilent Crosses in SO8 Package

PS8802-2HCPL-05301Mb Linear Dual SO8

PS9814-1HCPL-060110Mb Digital Single SO8

PS9814-2HCPL-063110Mb Digital Dual SO8

NECAgilent

1Mb Linear Single SO8

HCPL-0501 PS8802-1 R

R

R

R

15Mb Digital Single SO8

HCPL-060L PS9821-1 R

15Mb Digital Dual SO8

HCPL-063L PS9821-2 R

Note – Devices in red 3.3V

Power Sourcing Equipment (PSE)

PS9821-1,2PS8802-1,2PS2701A-1

PD-64012PowerDsine / Motorola

PS9821-1,2PS8802-1,2PS2701A-1

LTC4259LTC4255

Linear Technology

PS9821-1,2PS8802-1,2PS2701A-1

TPS2383ATPS2384(Prelim)

Texas Instruments

PS9821-1,2PS8802-1,2PS2701A-1

MAX5935Maxim

NEC/CEL partsPower Sourcing Chipset

Chip Vendor

Powered Devices (PD)

The PD chip sets do not require isolation. The DC/DC converter always associated with the chip set may require a standard coupler for isolated feedback.

PS2703-1PS2701A-1

LTC4257LTC4257-1

Linear Technology

PS2703-1PS2701A-1

TPS2370Texas Instruments

PS2703-1PS2701A-1

MAX5910Maxim

NEC/CEL partsPower Sourcing Chipset

Chip Vendor

Move to Lead Free

The long expected European ban on lead in electrical and electronic equipment will come into force on 1st July 2006, nearly 2 years earlier than the date proposed in the original draft of the legislation.By Stephanie GordonEE TimesNovember 7, 2002 (7:25 a.m. EST)

•European countries are requiring lead be removed from products

•NEC is ready with a complete line of lead free Couplers and relays

•Most products already tolerate the new processing requirements.

•Other products have been modified to meet the new requirements

•NEC has replaced SnPb with SnBi

•Compatible with lead free solders

•Compatible with Existing lead based solders

•All couplers maintain MSL1

Pb

PoE Questions To Ask

International or US designCan require extra certifications BSI / VDE / CSA etc.

Switching Speed Required0-20Mb Low Speed/ 20kb-25Mb High Speed

PD and Status / InterruptOperating Voltage

Drive Current Range0.5mA/1mA/5mA/10mA

CTR requirementsRanked/ Unranked

Operating Temperature

I2C and Serial ApplicationsAnalog or Digital

Operating Temperature

Switching Speed Required

Power Supply Voltage

Contact Information

CEL4590 Patrick Henry Dr.

Santa Clara, CA 95054

(408)988-3500

MarketingMatthew Laubengayer

(408)588-2208

matthew.laubengayer@cel.com

Applications SupportMark Cantrell

(408)588-2254

mark.cantrell@cel.com