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Rev B

DEMO MANUAL DC1843B

DESCRIPTION

DC1842B and DC1680B

LTC4290B/LTC4271 

8-Port PSE with Digital Isolation 

Demonstration kit DC1843B is an 8-port Ethernet Alliance™ 

certified IEEE 802.3at Type 2 power sourcing equipment 

(PSE) composed of a DC1842B daughter card and DC1680B 

motherboard. The kit is used for evaluation of the 

LTC4290B

 

and 

LTC4271

 PSE chipset. Up to 8 powered devices (PDs) 

can be connected and powered from this system using a 

single power supply. A DC590 is connected to the DC1843 

for I

2

C interfacing with QuikEval™. This demonstration 

manual provides a Quick Start Procedure, a DC1842B 

overview, a DC1680B overview, schematics, and layout 

BOARD PHOTO

printouts. Refer to the Layout Guide for Demonstration 

Circuit 1842B when laying out the LTC4290B/LTC4271 

circuit. Contact Analog Devices for this document.
The DC1842B has increased surge protection over the 

DC1842A. The DC1680B uses discrete Ethernet transform-

ers while the DC1680A has an integrated 12-port RJ45 jack.

Design files for this circuit board are available.

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

Содержание Analog Devices DC1680B

Страница 1: ...y ADC590isconnectedtotheDC1843 for I2C interfacing with QuikEval This demonstration manual provides a Quick Start Procedure a DC1842B overview a DC1680B overview schematics and layout BOARD PHOTO prin...

Страница 2: ...o HI Figure 1 to enable AUTO pin mode 2 On the DC1842B set MID jumper JP2 to LO Figure 1 to disable midspan mode 3 Alignpin1ofthe30 pinmaleconnectorontheDC1842B with pin 1 of the 30 pin female connect...

Страница 3: ...3 Rev B DEMO MANUAL DC1843B QUICK START PROCEDURE Figure 3 DC1843B Basic Setup Figure 4 DC1843 System Setup with the DC590 DC1680 DC1842 and 51V to 57V Power Supply 408 432 1900 www analog com...

Страница 4: ...anagement features in the LTC4290B LTC4271 chipset include per port 12 bit current monitor ing ADCs DAC programmable current limit and versatile quick shutdown of preselected ports PD discovery uses a...

Страница 5: ...ommunication across an isolation barrier through a data transformer Figure 6 This eliminates the need for expensive opto couplers All digital pins reside on the digital ground refer ence and are isola...

Страница 6: ...the states of the LTC4290B LTC4271 chipset general purpose input outputpins Thesepinsareconfiguredasinputsoroutputs via I2C GP1 and GP0 are referenced to DGND and driven by the LTC4271 when set as ou...

Страница 7: ...be subject to significant cable surge events TokeepPoEvoltagesbelowasafelevelandprotect the application against damage protection components as shown in Figure 11 are required at the main supply at th...

Страница 8: ...gure 3 Test points for port outputs OUT1 through OUT8 are provided 8 Port Configuration TheDC1680Bisconfiguredforan8 portPSEmotherboard for the DC1843B kit Four RJ45 dust caps at J3 and four dust caps...

Страница 9: ...oller is thenheldinactivewithallportsoffandallinternalregisters reset to their power up states When SW1 is released RESETispulledhigh andthePSEbeginsnormaloperation PushbuttonswitchSW2whenpressedpulls...

Страница 10: ...ort Power LEDs Interrupt LED A red LED indicates when the INT line is pulled logic low by the daughter card When the interrupt is cleared high via I2C servicing the LED is turned off Port 1 Through 8...

Страница 11: ...power supply is connectedtoVEEwithbananacables TheDC590connects with a 14 pin ribbon cable to the DC1680B and to a PC via USB On the PC a GUI communicates with the board At the PSE output PDs are conn...

Страница 12: ...12 Rev B DEMO MANUAL DC1843B www analog com DEMONSTRATION CIRCUIT 1842B LAYOUT Top Assembly Layer 1 Top Layer...

Страница 13: ...13 Rev B DEMO MANUAL DC1843B Layer 2 VEE Plane 1 DEMONSTRATION CIRCUIT 1842B LAYOUT Layer 3 VEE Plane 2...

Страница 14: ...14 Rev B DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1842B LAYOUT Layer 4 Bottom Layer Bottom Assembly ADI...

Страница 15: ...15 Rev B DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Top Assembly 408 432 1900 www analog com...

Страница 16: ...16 Rev B DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 1 Top Layer...

Страница 17: ...17 Rev B DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 2 AGND CGND Plane 1...

Страница 18: ...18 Rev B DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 3 SIG AGND CGND Plane 2...

Страница 19: ...19 Rev B DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 4 SIG AGND CGND Plane 3...

Страница 20: ...20 Rev B DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 5 SIG AGND CGND Plane 4...

Страница 21: ...21 Rev B DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 6 Bottom Layer...

Страница 22: ...22 Rev B DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Bottom Assembly ADI...

Страница 23: ...LIABLE OPERATION IN THE ACTUAL APPLICATION COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY CONTACT LINEAR TECHNOLOGY APPLICATIONS EN...

Страница 24: ...EET OF TITLE APPROVALS PCB DES APP ENG Fax 408 434 0507 Milpitas CA 95035 Phone 408 432 1900 1630 McCarthy Blvd LTC Confidential For Customer Use Only CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST...

Страница 25: ...OGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER SUPPLIED SPECIFICATIONS HOWEVER IT REMAINS THE CUSTOMER S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLIC...

Страница 26: ...0 McCarthy Blvd LTC Confidential For Customer Use Only CUSTOMER NOTICE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER SUPPLIED SPECIFICATIONS HOWEVER IT REMAINS THE C...

Страница 27: ...M T DILIAN R Friday September 04 2015 SIZE DATE V E R O N C I SHEET OF TITLE APPROVALS PCB DES APP ENG Fax 408 434 0507 Milpitas CA 95035 Phone 408 432 1900 1630 McCarthy Blvd LTC Confidential For Cus...

Страница 28: ...disclose or transfer any portion of the Evaluation Board to any other party for any reason Upon discontinuation of use of the Evaluation Board or termination of this Agreement Customer agrees to prom...

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