Analog Devices DC2685B-KIT Guide de configuration rapide

DEMO MANUAL

DC2685B-KIT

Rev. B

DESCRIPTION

DC2683A and DC2684A-B

LTC4291-1/LTC4292

4-Port IEEE 802.3bt PSE

Demonstration circuit 2685B-KIT is an Ethernet Alliance

Gen 2 PoE certified 4-port IEEE802.3bt power sourcing

equipment (PSE) composed of a DC2684A-B (daugh-

ter card) and DC2683A (motherboard). The DC2685B-

KIT is used for evaluation of the LTC

4291-1/LTC4292

PSE chipset. Up to four IEEE802.3af, IEEE802.3at, or

IEEE802.3bt powered devices (PDs) can be connected

All registered trademarks and trademarks are the property of their respective owners.

BOARD PHOTO

and powered from this system using a single power sup-

ply. A DC590 is connected to the DC2685B-KITfor I2C

interfacing withQuikEval™.

This demonstration manual provides a quick start proce-

dure, a DC2684A-B daughter card overview, a DC2683A

mother board overview, schematics, and layout printouts.

Design files for this circuit board are available.

DEMO MANUAL

DC2685B-KIT

Rev. B

QUICK START PROCEDURE

Follow the quick start procedure below for basic operation

of the DC2685B-KIT. Refer to Figure1 through Figure3

and Table 1 through Table 4 for proper equipment setup.

1. On the DC2684A-B daughter card set AUTO jumper

JP1 (Figure 1) to a selected AUTO mode setting

shown in Table 1.

2. On the DC2684A-B daughter card set 4PV# jumper

JP2 (Figure1) to a selected 4-Pair Valid setting as

shown in Table 1.

3. On the DC2684A-B daughter card set PM1 jumper

JP4 and PM0 jumper JP3 (Figure1) to the power

mode for evaluation specified in Table 2.

4. Align pin 1 of the 30-pin male connector on the

DC2684A-B daughter card with pin 1 of the 30-pin

female connector on the DC2683A motherboard

as shown in Figure2. Pin 12 is polarized to assist

with the alignment. Carefully push the daughter card

straight down until the male and female 30-pin con-

nectors are flush with each other.

5. Connect a supply to the motherboard with the pos-

itive rail to AGND (+) and negative rail to VEE (–) as

shown in Figure3. Use a power supply capable of

sourcing the maximum delivered power for all four

ports set by JP3 and JP4 on the daughter card (or

I2C configured power). Ramp the supply up to within

the recommended voltage range specified in Table 3.

6. Set the LTC4291-1/LTC4292 I2C address switch SW1

on the motherboard to the one of the four addresses

shown in Table 4.

7. On the DC590, set the VCCIO jumper JP6 to 3.3V.

(Refer to Table 5 and the DC590 demo manual for

further instructions for the DC590.)

8. Connect the DC590 to the DC2683A at connector J6

with a 14-pin ribbon cable as shown in Figure3 and

open the QuikEval GUI. A GUI for the LTC4291-1/

LTC4292 is brought up by QuikEval. (Follow the

DC590 demo manual instructions if this has not been

previously setup.)

9. Connect up to four PDs to the DC2685B-KIT RJ45

connector J1, bottom row ports 1-4 as shown in

Figure3.

10. Optionally a 1000BASE-T data source may be con-

nected to the DC2685B-KIT RJ45 connector J1, top

row ports 1-4 for data pass through testing.

DEMO MANUAL

DC2685B-KIT

Rev. B

QUICK START PROCEDURE

Figure1. DC2684A-B Jumpers: AUTO, 4PV#, PM0 and PM1

Figure2. Inserting the DC2684A-B Daughter Card Into J7 of the DC2683A Motherboard

DEMO MANUAL

DC2685B-KIT

Rev. B

QUICK START PROCEDURE

Table 1. DC2684A-B AUTO and 4PV# Jumper Settings

JUMPER SETTING OPERATION

AUTO (JP1) LO Host Control Required

HI Autonomous

4PV# (JP2) LO Port powered only when both

pairsets present a valid signature

HI Any pairset presenting a valid

signature is powered

Table 3. DC2685B-KIT Power Supply Voltage Range per PSE Type

IEEE TYPE Supply Voltage Range

Type 3 51V to 57V

Type 4 53V to 57V

Table 4. DC2685B-KIT Address Settings

SW3 ADDRESS

AD3 AD2

LO LO 20h

LO HI 24h

HI LO 28h

HI HI 2Ch

Table 2. DC2684A-B Auto Mode Maximum Delivered Power

Capabilities Jumper Settings

PM1

(JP4)

PM0

(JP3)

Max Port Power

(Single-Signature)

Max Pairset Power

(Dual-Signature)

LO LO 40W 13W

LO HI 51W 25.5W

HI LO 62W 25.5W

HI HI 71.3W 35.6W

Figure3. DC2685B-KIT Connections

DEMO MANUAL

DC2685B-KIT

Rev. B

DEMONSTRATION CIRCUIT 2684A-B DAUGHTER CARD

Figure4. DC2684A-B Digital and Analog Isolation

Demonstration circuit 2684A-B is an IEEE802.3bt 8-chan-

nel PSE daughter card that features the LTC4291-1/

LTC4292 chipset. This daughter card mates with a 4-Port,

4-Pair PoE motherboard for use in IEEE 802.3bt Type 3 or

4 compliant Power over Ethernet PSE systems.

Board Layout

Parts placement, sense resistor block and Kelvin sens-

ing, copper fill, trace routing, and spacing are crucial

for LTC4291-1/LTC4292 chipset operation, robustness,

and measurement accuracy. It is imperative to follow

the layout requirements specified in the LTC4291-1/

LTC4292 data sheet. The DC2684A-B demonstrates

proper LTC4291-1/LTC4292 board layout on a compact

daughter card approximately the height and width of a 2

× 4 RJ45 connector.

Isolation and Power Supplies

The LTC4291-1/LTC4292 chipset provides communica-

tion across an isolation barrier through a data transformer

(Figure4). All digital pins reside on the digital ground

reference and are isolated from the analog PoE supply on

the daughter card layout. A VDD logic supply and VEE PoE

supply is brought in at the 30-pin connector J1.

VDD33

VDD

DND

CPD

CND

DPD

AGNDP

VEE

DNA

VEE

ISOLATION

WÜRTH 7490100143

CPA

30-PIN

CONNECTOR

DC2684 SIDE MOTHERBOARD SIDE

VDD SUPPLY

VEE SUPPLY

CNA

DPA

TX+

RX–

CT(4)

CT(2)

RX+

TX–

TD+

RD–

CT(3)

RD+

TD–

LTC4291-1

LTC4292

C23

1µF

C21

0.1µF

R13

100Ω

DC2685B F04

DGND

C19

1µF

100V

TVS, 58V

R14

100Ω

C22

1µF

R15

100Ω

R16

100Ω

R21

100Ω R35

10Ω

R22

100Ω

R23

100Ω

R24

100Ω

C24, 2.2nF

2kV

TVSBULK

CBULK

–

DEMO MANUAL

DC2685B-KIT

Rev. B

I/O LED Indicators

The DC2684A-B features two LEDs to indicate the states

of the LTC4291-1/LTC4292 general purpose input/output

pins GP0 and GP1. These pins are configured as inputs or

outputs via I2C. GP1 and GP0 are referenced to DGND and

driven by the LTC4291-1 when set as outputs (Figure5).

J2 provides test points for these pins.

DEMONSTRATION CIRCUIT 2684A-B DAUGHTER CARD

VDD

GP1

GP0

DGND

J2, PIN 5

J2, PIN 6

LTC4291-1

DC2685B F05

R28

560Ω R29

560Ω

GRN

GP0

GRN

GP1

Figure5. DC2684A-B, LTC4291-1 General Purpose I/O LED

Indicators

Figure6. DC2684A-B, LTC4291-1 I2C and Address Connections

I2C Communication and Addressing

The LTC4292/LTC4291 internal registers are accessed via

I2C to read and/or write configuration, status, events and

interrupt registers. The I2C lines SDAOUT, SDAIN and SCL

connect to the 30-pin connector (Figure6). Subsequently,

the I2C bus is accessed on the motherboard. SDAOUT and

SDAIN are tied together through shunt resistor R11 on

the DC2684A-B for a common SDA line.

The LTC4291-1 address pins AD0 and AD1 are tied to

DGND through shunt resistors R9 and R10 respectively.

This sets these two address bits low. Address pins AD2

and AD3 are brought out to the 30-pin connector for con-

figuration on the motherboard. See Figure6 and Table 4.

4PV# Jumpers

The 4PVALID pin of the LTC4291-1 is set by the 4PV#

jumper JP2 on the DC2684A-B. See Table 1 for jumper

settings. This jumper configuration along with Auto mode

reset state is used to automatically determine the number

DGND

SDAOUT

SDAIN

SCL

INT

SDAOUT

SDAIN

SCL

INT

AD3

AD2

AD1

AD0

AD3

AD2

TO 30-PIN

CONNECTOR

LTC4291-1

R11

0Ω

DC2685B F06

0Ω R10

0Ω

of powered pairs. Refer to Table 1 for the configuration

description.

Power Mode and Power Path Components

The DC2684A-B power mode jumpers PM1 and PM0

either tie the respective LTC4291-1/LTC4292 PWRMD1

and PWRMD0 pins to V

or CAP2 through a 100Ω resis-

tor. This configures the maximum port output power in

the Auto mode reset state (see Table 2). The power path

components (hot swap MOSFETs and resistors) for each

channel on the DC2684A-B have been selected to handle

all four power levels.

Surge Protection

The DC2684A-B has basic surge protection components

across the VEE supply, VEE and AGNDP supply pins, and

OUTnM pins. Refer to the LTC4291-1/LTC4292 hardware

data sheet for further details on surge protection. D5 and

C27 on the DC2684A-B provide example bulk TVS and

DEMO MANUAL

DC2685B-KIT

Rev. B

DEMONSTRATION CIRCUIT 2683A MOTHER BOARD

capacitance components;these components must be

sized to the final system requirements.

Demonstration circuit 2683A is a 4-Port, 2-channels per

port IEEE 802.3bt PoE PSE motherboard. This board

accepts an IEEE 802.3bt four port PSE daughter card

featuring the LTC4291-1/LTC4292 chipset.

Daughter Card Insertion Precautions

When inserting or removing the daughter card into the

DC2683A motherboard, verify all supplies and LEDs are

off. Push the card straight down for insertion or pull

straight up for removal to avoid bending the connector

pins. Follow the instructions in the Quick Start Procedure

for alignment.

Main VEE PoE Supply

The VEE supply is the main PoE supply and connects to

the DC2683A with the positive rail to AGND (+) and the

negative rail to VEE (–) as shown in Figure3 of the Quick

Start Procedure. The voltage must be within the range

shown in Table 3 depending on the application PSE type.

For full load testing at each port, choose a power supply

that is set with a current limit higher than the maximum

allowed output power at each port.

Onboard 3.3V Supply

The DC2683A motherboard has an onboard (non-iso-

lated) 3.3V LDO for the LTC4291-1/LTC4292 VDD supply

which is generated from the V

supply. This onboard

logic supply is for demonstration purpose to allow for

a single supply connection to the DC2685B-KIT. DGND

is tied to VEE through shunt resistor R42. To isolate the

logic supply from the PoE supply, remove R42 and R41

and apply an external isolated 3.3V supply across VDD and

DGND. If the DC2685B-KIT is connected in parallel for

multi-quad port evaluation, verify all ground connections

are correct before applying power.

LED Indicators

VEE LED (D5) and VDD LED (D7) indicate if a voltage is

present at these supplies. Verify these LEDs are off before

inserting or removing the daughter card.

Each pairset channel (2 per port) has a respective OUTnM

LED to indicate if the channel is powered on with PoE.

The INT LED (D6) indicates if the interrupt line is pulled

low by the daughter card. When the interrupt is cleared

(high) via I2C interrupt servicing, the LED is turned off.

Digital Connections

The DC590 (USB to I

C) controller board is connected

to the DC2683A at J6 through a 14-pin ribbon cable. The

QuikEval software must be previously installed. When

QuikEval is opened, the software will automatically detect

the DC2685B-KIT and open the LTC4291-1 GUI.

I2C address pins AD3 and AD2 are set with a 2-bit switch

SW3 on the DC2683A. Refer to Table 4 for setting the

individual I2C address for each DC2685B-KIT.

Turret digital test points for SCL, SDA, DGND, INT, MSD,

and RESET are provided on the DC2683A.

RJ45 Connections

PDs are connected using an Ethernet cable to any of the

bottom row ports at 2 ×4, RJ45 connector J1 on the

DC2683A. Test points for each channel output OUT1A

through OUT4B, are provided. Optionally, an Ethernet data

source may be connected with an Ethernet cable to any of

the top row ports at J1.

MSD and RESET Pushbuttons

Pushbutton switch SW1, when pressed, pulls the RESET

pin of the daughter card logic low. The PSE controller

is then held inactive with all ports off. When SW1 is

released, RESET is pulled high, and the PSE returns to

the AUTO pin reset state.

Pushbutton switch SW2, when pressed, pulls the mas-

kable shutdown input (MSD) pin of the daughter card

logic low. When pressed, all ports that have their corre-

sponding mask bit set in the mconfig register of the PSE

controller will be shutdown. These ports must then be

manually re-enabled via I2C or by resetting the PSE.

DEMO MANUAL

DC2685B-KIT

Rev. B

Table 5. DC590 Jumper Selection. Refer to the DC590 Demo Manual for Further Details.

JUMPER SETTING OPERATION

JP1 PROG Microcontroller in-circuit programming header. Do NOT install jumper; make no

connections.

JP2 MODE Do NOT install jumper; make no connections.

JP3 Watchdog Enables Do NOT install jumper; make no connections.

JP4 EE Jumper MUST be in the EN position.

JP5 SW

(Right Hand Side) MUST be in the ON position.

See Connections section.

ISO

(Left Hand Side) Controls the isolated supply.

See Connections section.

JP6 VCCA Control See Connections section.

SUPPLEMENTARY

DEMO MANUAL

DC2685B-KIT

Rev. B

DC2684A-B DAUGHTER CARD LAYOUT FILES

Figure7. DC2684A-B Top Silkscreen

Figure8. DC2684A-B Top Layer

DEMO MANUAL

DC2685B-KIT

Rev. B

DC2684A-B DAUGHTER CARD LAYOUT FILES

Figure9. DC2684A-B Inner Layer 2

Figure10. DC2684A-B Inner Layer 3

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