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dc1843bfa

DEMO MANUAL DC1843B

Linear Technology  Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417  

(408) 432-1900 

 

FAX

: (408) 434-0507 

 

www.linear.com

 

LINEAR TECHNOLOGY CORPORATION 2012

LT 1215 REV A • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) provides the enclosed product(s) under the following 

AS IS

 conditions:

This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for 

ENGINEERING DEVELOPMENT 

OR EVALUATION PURPOSES ONLY

 and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete 

in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety 

measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union 

directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date 

of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU 

OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS 

FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR 

ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims 

arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all 

appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or 

agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. 

LTC assumes no liability for applications assistance, 

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LTC currently services a variety of customers for products around the world, and therefore this transaction 

is not exclusive

.

Please read the DEMO BOARD manual prior to handling the product

. Persons handling this product must have electronics training and 

observe good laboratory practice standards. 

Common sense is encouraged

.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

Copyright © 2004, Linear Technology Corporation

Содержание DC1680B

Страница 1: ...manual provides a Quick Start Procedure a DC1842B overview a DC1680B overview schematics and layout printouts Refer to the Layout Guide for Demonstration Circuit 1842B when L LT LTC LTM Linear Technology and the Linear logo are registered trademarks and QuikEval is a trademark of Linear Technology Corporation All other trademarks are the property of their respective owners BOARD PHOTO laying out t...

Страница 2: ... jumper JP1 to 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 connector on the DC1680B Figure2 Pin12ispolarizedtoassistwiththe alignment Carefully push the DC1842B straight down untilthetwo30 pinconnectorsareflushwitheachother 4 On the DC1680B connect a su...

Страница 3: ...3 dc1843bfa 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 ...

Страница 4: ...ed power management 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 proprietarydualmode4 pointdetectionmechanismensur ing excellent immunity from false PD detection Midspan PSEs are supported with 2 event classification and a two second backoff timer The LT...

Страница 5: ...ides communication 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 isolated from the analog PoE supply A 3 3V supply for VDD and an isolated VEE supply are connected to the DC1842B through the 30 pin connector VDD33 VDD33 T1 DND CPD CND DPD AGND VEE DNA VEE VEE ISOL...

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 outputs Figure 8 XIO0 and XIO1arereferencedtoVEE andaredrivenbytheLTC4290B when set as outputs Figure 9 J2 provides test points for access to these I Os Figure 8 DC1842B LTC4290B General Purpose I O LED...

Страница 7: ...n 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 the LTC4270 supply pins and at each port Bulk transient voltage suppression TVSBULK and bulk capacitance CBULK are required across the main PoE supply and should be sized to accommodate system level s...

Страница 8: ...re 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 at J4 are inserted to block off the four unused Ethernet ports Additional pegs are placed in the last 4 pins of connector J1 to block off the unused pins when the DC1842B daughter card is inserted DC16...

Страница 9: ...enheldinactivewithallportsoffandallinternalregisters reset to their power up states When SW1 is released RESETispulledhigh andthePSEbeginsnormaloperation PushbuttonswitchSW2whenpressedpullsthemaskable shutdown input MSD pin of the daughter card logic low Whenpressed allportsthathavetheircorrespondingmask bit set in the mconfig register of the PSE controller will be shutdown These ports must then b...

Страница 10: ...EDs 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 Power LED Indicators Each PSE port has a green LED indicator to show when PoE power is present at the port The LEDs are driven by the respective port OUT voltage ...

Страница 11: ... A 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 connected A sample PD demo board is shown in Figure 14 Table 2 DC1843 Kit Versions VERSION FEATURES DC1843A DC1680A Motherboard with Integrated Magjack DC1842A 8 Port PSE Daughter Card DC1843B DC1680B ...

Страница 12: ...12 dc1843bfa DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1842B LAYOUT Top Assembly Layer 1 Top Layer ...

Страница 13: ...13 dc1843bfa DEMO MANUAL DC1843B Layer 2 VEE Plane 1 DEMONSTRATION CIRCUIT 1842B LAYOUT Layer 3 VEE Plane 2 ...

Страница 14: ...14 dc1843bfa DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1842B LAYOUT Layer 4 Bottom Layer Bottom Assembly ...

Страница 15: ...15 dc1843bfa DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Top Assembly ...

Страница 16: ...16 dc1843bfa DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 1 Top Layer ...

Страница 17: ...17 dc1843bfa DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 2 AGND CGND Plane 1 ...

Страница 18: ...18 dc1843bfa DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 3 SIG AGND CGND Plane 2 ...

Страница 19: ...19 dc1843bfa DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 4 SIG AGND CGND Plane 3 ...

Страница 20: ...20 dc1843bfa DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 5 SIG AGND CGND Plane 4 ...

Страница 21: ...21 dc1843bfa DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 6 Bottom Layer ...

Страница 22: ...22 dc1843bfa DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Bottom Assembly ...

Страница 23: ...RELIABLE OPERATION IN THE ACTUAL APPLICATION COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS SCALE NONE www linear com 1 1 1 8 PORT PSE DAUGHTER CARD WITH DI...

Страница 24: ... SHEET OF TITLE APPROVALS PCB DES APP ENG TECHNOLOGY 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 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 APPLICATION...

Страница 25: ...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 APPLICATION COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE THIS CIRCUIT IS PROPRIETA...

Страница 26: ... 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 CUSTOMER S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY CONTACT ...

Страница 27: ...V SHEET OF TITLE APPROVALS PCB DES APP ENG TECHNOLOGY 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 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 APPLICATIO...

Страница 28: ...INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE EXCEPT TO THE EXTENT OF THIS INDEMNITY NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES The user assumes all responsibility and liability for proper and safe handling of the goods Further the user releases LTC from all claims arising from the handling or use of the...

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