designing 1-port poe system using...

AN3580 Designing 1-port PoE System Using PD69201

IntroductionThis application note provides detailed information and circuitry design guidelines for the implementation of a singleport Power over Ethernet (PoE) system, based on Microchip’s 1-port PSE PoE manager, PD69201. This enables thedesigner to integrate PoE capabilities, as defined by the IEEE® 802.3af/at standard into an Ethernet switch or arouter.

A PD69201 based design is intended for low-cost applications where PoE implementation is required but there is noneed for sophisticated features such as power management.

For ease of design and development of an Ethernet switch using PD69201, order evaluation board PD-IM-7601.

The document describes both the managed and the unmanaged configuration for a 1-port system. In the managedconfiguration, PD69201 is controlled by a HOST processor through an I2C bus. In the unmanaged configuration,PD69201 operates as a standalone system without any communication to the host.

PD69201 executes all the real-time functions as specified in the IEEE 802.3af and IEEE 802.3at standards, includingload detection and “AF” and “AT” classification using Multiple Classification Attempts (MCA). PD69201 also supportslegacy or pre-standard detection. PD69201 supports the DC disconnection method, as specified in the IEEE 802.3atstandard. PD69201 provides PD real-time protection through the following mechanisms: overload, under load, overvoltage, over temperature, and short-circuit.

Features• Designed to support IEEE 802.3af and IEEE 802.3at including two event classification• Supports pre-standard PD detection• Single DC voltage input: 32V–57V• Wide temperature range: –40°C to 85°C• Low thermal dissipation (internal 100 mΩ sense resistor)• Includes I2C communication• Continuous port and system data monitoring (port current is not measured)• Power soft-start algorithm• On-chip thermal protection• Voltage and temperature monitoring and protection• Internal Power-on Reset (POR)• MSL1 and RoHS compliant

© 2020 Microchip Technology Inc. Application Note DS00003580C-page 1

Table of Contents

Introduction.....................................................................................................................................................1

1. Features....................................................................................................................................... 1

1. Overview................................................................................................................................................. 3

2. Circuit Description................................................................................................................................... 4

2.1. Main Supply..................................................................................................................................42.2. Grounds........................................................................................................................................42.3. 5V Regulator................................................................................................................................ 42.4. Control..........................................................................................................................................42.5. Indicators......................................................................................................................................42.6. Reference Current Source........................................................................................................... 42.7. Communication Interface............................................................................................................. 52.8. Surge Requirements.................................................................................................................... 62.9. Unmanaged Mode........................................................................................................................72.10. Managed Mode............................................................................................................................ 8

3. Bill of Material for Unmanaged Applications........................................................................................... 9

4. Bill of Material for Managed Applications.............................................................................................. 11

5. Reference Documents.......................................................................................................................... 13

6. Revision History.................................................................................................................................... 14

The Microchip Website.................................................................................................................................15

Product Change Notification Service............................................................................................................15

Customer Support........................................................................................................................................ 15

Microchip Devices Code Protection Feature................................................................................................ 15

Legal Notice................................................................................................................................................. 15

Trademarks.................................................................................................................................................. 16

Quality Management System....................................................................................................................... 16

Worldwide Sales and Service.......................................................................................................................17

AN3580


1. OverviewThe main mode of operation of the system is a 2-pair PoE port, based on one PD69201 PoE manager.Figure 1-1. 2-Pair Mode

AN3580Overview


2. Circuit DescriptionThe 1-port, 2-pair configuration shown in Figure 1-1 comprises one PoE manager circuit (PD69201), acting asalternative-A feeding power over the data lines.

2.1 Main SupplyThe PoE system operates within a range of 44 VDC to 57 VDC with no need for additional power supply sources.

This power must be isolated from the switch supply and chassis by 1500 Vrms.

2.2 GroundsThe system utilizes chassis and analog grounds.

The chassis ground is connected to the chassis ground of the switch. This ground plane must be 1500 Vrms isolatedfrom the PoE circuitry.

2.3 5V RegulatorPD69201 includes an internal 5 VDC regulator (DRV_VAUX5) that provides up to 10 mA current. This current isutilized for powering PD69201 and up to 3 mA is available for the components external to the PoE domain. Thosecomponents must also be isolated by 1500 Vrms from the switch circuitry. If more than 3 mA is required, then the 5VDC regulator can be boosted by an external transistor, which enables powering the peripheral circuitry up to 20 mA.

2.4 ControlA reset control signal is utilized to disable the port. PD69201 is still active and able to communicate with the host.

2.5 IndicatorsPD69201 produces a direct LED indication that is utilized to indicate PoE events.

2.6 Reference Current SourceReference for internal voltages within PD69201 is set by a 240 kΩ 1% resistor to AGND.

AN3580Circuit Description


2.7 Communication InterfaceThe Host CPU issues commands utilizing I2C Communication Protocol to PD69201 through an isolation componentU3 (refer to Figure 2-2).

PD69201 transmits the port and system data.

• Data stream is transmitted through Mode/SDA (pin 4)• Clock stream is transmitted through Power_set/SCL (pin 5)

Setting:

• Port on/off• Modes:

– Alt A/B– Current set (Ilim)– Legacy detection

• Timing:– Tcut– Tlim– UDL (TMPS)

Reading:

• Port voltage• Resistor detection result• Classification result• Port state machine status• Device version



2.8 Surge RequirementsSurge requirements are system requirements and must be tested on a system level. This application note assists thedesigner to implement primary protection mechanisms from outdoor surge events usually located betweenEquipment Under Test (EUT) and external cable.

This application note also contains recommendations for the system containing PD69201 to meet PoE surgerequirements of the standards and levels, as listed in the following table.

Table 2-1. Surge Standards

# Standard Test Circuit Waveform Level [±] TestedChannelCondition

CouplingMode

Comments

1 ITU-T K21 2018

Test 2.1.11

1.2/50 μs–8/20 μs

R1 = 10Ω

R2 = 10Ω

6 kV Channel OFF Differential With additionalexternalcomponents

2 ITU-T K21 2018

Test 2.1.8

1.2 μs/50 μs–8 μs/20 μs

R = 10Ω

6 kV Channel OFF Common With additionalexternalcomponents

3 ITU-T K21 2018

Test 2.1.4a

10 μs/700 μs

R = 25Ω

6 kV Channel OFFand ON

Common With additionalexternalcomponents

4 IEC61000-4-5 :2014 1.2 μs/50 μs

R = 40Ω (4x160Ω)


Common —

5 EN55024:2010 10 μs/700 μs

R = 40Ω (4x160Ω)


Common —



2.9 Unmanaged ModeIn the unmanaged application, as shown in Figure 2-1, Mode and Power are set by the Mode (pin 4) and Power_set(pin 5) by connecting the external resistor to the GND.

In this application, PD69201 is configured to work in the following mode:

• Resistor on Mode (pin 4) is 34.8 kΩ– Function:

• Alt A (PoE on data pair)• Detection resistor only• Startup Ilim check

• Resistor on Power_set pin is 200 kΩ– Function:

• AT 30W• Perform classification

For different configuration options, see the PD69201 Data Sheet, DS00003454.Figure 2-1. PD69201 Unmanaged Application Circuitry

5

5

4

4

3

3

2

2

1

1

D D

C C

B B

A A

Note 1: Optional components for 6kV surge

Note 1

Note 1

Vmain

GND_Analog

VPORT_POS

VPORT_NEG

Vmain

Vmain

VAUX5

VAUX5

Vmain

C8

100n

pd-0805-w

100v

X7R

R168.1KPD-0805

D4

SSL-LX3044GCGreen

LED-EVERLIGHT-204

21

C2100n100v

PD-0805X7R

C71n 2000V

X7R

RV1

12

C41n2000V

R634.8K

PD-0603

R7200K

PD-0603

R4240K

PD-0805

R224.9K

PD-1206-W

C11n2000V

U1

PD69201ILD-TR.PD-DFN-10-4X3-1

Iref1

ATB_N/Disable2

Power_set/SCL5

MODE/SDA4

ATB_P3

LED8

PORT_NEG10

Vaux56

Vmain9

DRV_Vaux57

GND

11

+

C3

100v

47u

ALUD2

STPS1H100APD-SMA

21

TRS1P0640SCLRPPD-SMB-12

21

1

C9

100n

50V

X7RPD-0805

C6100n

100VX7RPD-1206

R510M

PD-0805

C10

4.7uF

25V

X7RPD-1206

D11SMA58AT3

PD-SMA

PD-SMA-W

21

D3

STPS1H100APD-SMA

21

R34.75K

PD-0402

R87.15M

C51n 2000V

X7R

Vport_Neg_out

vmain

Vport_Neg_out



2.10 Managed ModeIn the managed application, as shown in Figure 2-2, xDisable_Port (pin 2) is driven by the HOST CPU to disable thePoE port. When PD69201 detects low level voltage at pin 2, it immediately disables the port.

When driving this line by the HOST CPU, use an opto-coupler to isolate it by 1500 VDC from the switch domain anduse a 4.75 kΩ pull-up resistor to 5V.

In the unmanaged application, connect xDisable_Port (pin 2) with a 4.75 kΩ pull-up resistor to 5V.

Figure 2-2. PD69201 Managed Application Circuitry

5

5

4

4

3

3

2

2

1

1

D D

C C

B B

A A

Input voltage 44-57V

PoE sideHost side

Note 1

Note 1

Note 1: Optional components for 6kV surge

Vmain

GND_Analog

VPORT_POS

VPORT_NEG

VmainVmain

Vmain

VAUX5

VAUX55V

VAUX5

To HOSTTo HOST

To HOSTC8

100n

pd-0805-w

100v

X7R

C100.1uF

10VX7RPD-0805

D4Green

21

C6100n

100VX7RPD-1206

R53.32KPD-0805

RV1

12TRS1

P0640SCLRPPD-SMB-12

21

1

C41n

2000V

C2100n100v

PD-0805X7R

R961.9PD-0805

D3

STPS1H100APD-SMA

21

U1

MOC217 R2

PD-SO8

1

2 5

6

7

83

4

Q1MJD47PD-DPAK

1

32

C71n 2000V

X7R

R24.75KPD-0402

R324.9KPD-1206

R168.1KPD-0805

R6240K

PD-0805

C11n

2000V +

C3

100v

47u

ALU

U2

PD69201ILD-TR.PD-DFN-10-4X3-1

Iref1

ATB_N/Disable2

Power_set/SCL5

MODE/SDA4

ATB_P3

LED8

PORT_NEG10

Vaux56

Vmain9

DRV_Vaux57

GN

D1

1

C13

4.7uFX7RPD-1206

C11100n

50V

X7RPD-0805

D2

STPS1H100APD-SMA

21

C51n 2000V

X7R

R43.32KPD-0805

U3

ADUM1251PD-SO8

VDD11

SDA12

SCL13

GND14

GND25SCL26SDA27VDD28

R87.15M

R710M

PD-0805

D11SMA58AT3

PD-SMA

PD-SMA-W

21

C12

4.7uF

25V

X7RPD-1206

C90.1uF

10VX7RPD-0805

Vport_Neg_out

vmain

Disable

Vport_Neg_out

I2C_SCL

I2C_SDA

SDA_ISO I2C_SDASCL_ISO I2C_SCL

Disable



3. Bill of Material for Unmanaged ApplicationsThe following table lists the bill of material for the unmanaged application.

Table 3-1. Bill of Material for Unmanaged Application

Line Qty Reference Description Manufacturer Manufacturer’s P/N

1 4 C1, C4, C5, C7 CAP CRM 1 nF/2000V 10%X7R 1206 SMT

AVX 1206GC102KAT1A

Kemet C1206C102KGRAC

Meritek HC1206XR102K202

2 2 C2, C8 Capacitor, X7R, 100 nF 100V10% 0805

AVX 08051C104KAT2A

Murata GRM21BR72A104KAC4L

Vishay VJ0805Y104KXBTM

3 1 C6 CAP CRM 100 nF 100V 10%X7R 1206 SMT

AVX 12061C104KAT2A

Kemet C1206C104K1RACTU

Murata GRM319R72A104KA01D

4 1 C9 Capacitor, X7R, 100 nF, 50V,10% 0805

AVX 08055C104KAT4A

Kemet C0805X104K5RACTU

Vishay VJ0805Y104KXAMR

5 1 C3 CAP ALU 47 uF 100V 20%10X16

Nichicon UPW2A470MPD

SUNCON 100ME47AX

6 1 C10 CAP CRM X7R 4.7 uF 25V10% 1206 SMT

AVX 12063C475KAT2A


Murata GRM31CR71E475KA88L

7 1 D1 DIO TVS 58V 40A SRG 400WPK SMA SMT

Diodes Inc. SMAJ58A-13-F

ON Semi 1SMA58AT3G

STMicro SMAJ58A

8 2 D2, D3 DIO SCHOTTKY 100V 1ASMA

ON Semi MBRA1H100T3G

STMicro STPS1H100A

9 1 D4 LED 3 mm Green TH Lumex SSL-LX3044GC

10 1 R1 RES 68.1K 125 mW 1% 0805SMT

Samsung RC2012F6812CS

Yageo RC-0805FR-07 68K1L

11 1 R2 RES 4.75K 62.5 mW 1% 0402SMT

Vishay CRCW04024K75FKED

Yageo RC0402FR-074K75L

12 1 R3 RES 24.9K 250 mW 1% 1206SMT

Vishay CRCW120624K9FKEA


13 1 R7 RES 200K 62.5 mW 1% 0603SMT

Vishay CRCW0603200KFKEA

Yageo RC0603FR-07200KL

AN3580Bill of Material for Unmanaged Application...


...........continuedLine Qty Reference Description Manufacturer Manufacturer’s P/N

14 1 R6 RES 0R 62.5 mW 5% 0603SMT

Samsung RC1608J000CS

Vishay CRCW06030000Z0EA

15 1 R4 RES 240K 125 mW 1% 0805SMT



16 1 R5 RES 10M 125 mW 1% 0805SMT

Vishay CRCW080510M0FKEA

Yageo RC0805FR-0710ML

17 1 R8 RES 7.15M 125 mW 1% 1206SMT


Yageo RC1206FR-077M15L

18 1 RV1 VARISTOR 680 Vrms 5 KA 14MM

Epcos/TDK B72214S2421K101

ON Semi NP0640SCT3G

19 1 TRS1 SIDACtor 58V SMB Litlefuse P0640SCLRP

20 1 U2 PoE PSE IC Microchip PD69201ILQ-TR

Notes: • RV1, TRS1, D2, D3, and R8 are optional components for 6 kV surge test requirements.• These components can be removed if the system requires to pass up to 1 kV surge.• Capacitors C5 and C7 are optional components to improve EMI.

AN3580Bill of Material for Unmanaged Application...


4. Bill of Material for Managed ApplicationsThe following table lists the bill of material for the managed application.

Table 4-1. Bill of Material for Managed Application

Line Qty Reference Description Manufacturer Manufacturer’s P/N

1 4 C1,C4,C5,C7 CAP CRM 1nF/2000V10% X7R 1206 SMT

AVX 1206GC102KAT1A

Kemet C1206C102KGRAC

Meritek HC1206XR102K202

2 2 C2,C8 Capacitor, X7R, 100nF100V 10% 0805

AVX 08051C104KAT2A

Murata GRM21BR72A104KAC4L

Vishay VJ0805Y104KXBTM

3 1 C6 CAP CRM 100nF 100V10% X7R 1206 SMT

AVX 12061C104KAT2A


Murata GRM319R72A104KA01D

4 1 C11 Capacitor, X7R, 100nF,50V, 10% 0805

AVX 08055C104KAT4A

Kemet C0805X104K5RACTU

Vishay VJ0805Y104KXAMR

5 1 C3 CAP ALU 47uF 100V20% 10X16

Nichicon UPW2A470MPD

SUNCON 100ME47AX

6 2 C9,C10 CAP CRM 100n 10V 10%X7R 0805 SMT

AVX 0805ZC104KAT2A


Vishay VJ0805Y104KXQCW1BC

7 1 C12 CAP CRM X7R 4.7uF25V 10% 1206 SMT

AVX 12063C475KAT2A


Murata GRM31CR71E475KA88L

8 1 D1 DIO TVS 58V 40A SRG400WPK SMA SMT

Diodes Inc. SMAJ58A-13-F

ON Semi 1SMA58AT3G

STMicro SMAJ58A

9 2 D2,D3 DIO SCHOTTKY 100V1A SMA

ON Semi MBRA1H100T3G

STMicro STPS1H100A

10 1 D4 LED 3mm Green TH Lumex SSL-LX3044GC

11 1 Q1 TRN NPN 250V 1A 15WD-Pak SMT

Fairchild MJD47TF

ON Semi MJD47T4G

STMicro MJD47T4

12 1 R1 RES 68.1K 125mW 1%0805 SMT


Yageo RC-0805FR-07 68K1L

AN3580Bill of Material for Managed Applications


...........continuedLine Qty Reference Description Manufacturer Manufacturer’s P/N

13 1 R2 RES 4.75K 62.5mW 1%0402 SMT

Vishay CRCW04024K75FKED


14 1 R3 RES 24.9K 250mW 1%1206 SMT

Vishay CRCW120624K9FKEA


15 2 R4,R5 RES 3.32K 125mW 1%0805 SMT


Yageo RC0805FRF073K32L

16 1 R6 RES 240K 125mW 1%0805 SMT



17 1 R7 RES 10M 125mW 1%0805 SMT


Yageo RC0805FR-0710ML

18 1 R8 RES 7.15M 125mW 1%1206 SMT


Yageo RC1206FR-077M15L

19 R9 RES 61.9R 125mW 1%0805 SMT

Vishay CRCW080561R9FKEA

Yageo RC0805FR-0761R9L

20 1 RV1 VARISTOR 680Vrms 5KA14MM

Epcos/TDK B72214S2421K101

21 1 TRS1 SIDACtor 58V SMB Litlefuse P0640SCLRP

ON Semi NP0640SCT3G

22 1 U1 IC OPTOISOLATOR Fairchild MOC217R2-M

23 1 U2 PoE PSE IC Microsemi PD69201ILQ-TR

24 1 U3 IC Hot-Swap I2C Isolator2Ch SO-8

Analog Devices ADUM1251ARZ-RL7

Notes: • RV1, TRS1, D2, D3, and R8 are optional components for 6 kV surge test requirements.• These components can be removed, if the system requires to pass up to 1 kV surge.• Capacitors C5 and C7 are optional components to improve EMI.

AN3580Bill of Material for Managed Applications


5. Reference DocumentsFor access to documents, device datasheets, or application notes, consult your local Microchip Client EngagementManager or visit our website at www.microchip.com/poe.

• IEEE 802.3af-2003 standard, DTE Power via MDI• IEEE802.3at-2009 standard, DTE Power via MDI• PD69201 Data Sheet, Document Number DS00003454

AN3580Reference Documents


http://www.microchip.com/poe

6. Revision HistoryRevision Date Description

C November 2020 Following is the summary of changes:• Updated 2.3 5V Regulator.• Updated Figure 2-2.• Changed Table 4-1.

B October 2020 Following is the summary of changes:• Updated Figure 2-1.• Updated Figure 2-2.• Changed Table 3-1.• Changed Table 4-1.• Updated document ID of the PD69201 datasheet to DS00003454 in

the 2.9 Unmanaged Mode and the 5. Reference Documentssections.

• Added the 2.8 Surge Requirements section.

A August 2020 Initial revision

AN3580Revision History


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AN3580


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AN3580


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Introduction1. Features

Table of Contents1. Overview2. Circuit Description2.1. Main Supply2.2. Grounds2.3. 5V Regulator2.4. Control2.5. Indicators2.6. Reference Current Source2.7. Communication Interface2.8. Surge Requirements2.9. Unmanaged Mode2.10. Managed Mode

3. Bill of Material for Unmanaged Applications4. Bill of Material for Managed Applications5. Reference Documents6. Revision HistoryThe Microchip WebsiteProduct Change Notification ServiceCustomer SupportMicrochip Devices Code Protection FeatureLegal NoticeTrademarksQuality Management SystemWorldwide Sales and Service