Analog Devices DC1840C Demo Manual
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Analog Devices DC1840C Demo Manual

Analog Devices DC1840C Demo Manual

12-port pse with digital isolation
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DESCRIPTION
Demonstration kit DC1840C is a 12-port Ethernet Alliance™
certified IEEE 802.3at Type 2 power sourcing equipment
(PSE) composed of a DC1682B daughter card and DC1680B
mother board. The kit is used for evaluation of the
and
LTC4271
PSE chipset. Up to 12 powered devices (PDs)
can be connected and powered from this system using a
single power supply. A DC590 is connected to the DC1840
2
for I
C interfacing with QuikEval™. This demonstration
manual provides a Quick Start Procedure, a DC1682
overview, a DC1680 overview, schematics, and layout
BOARD PHOTO
DEMO MANUAL DC1840C
DC1682B and DC1680B
12-Port PSE with Digital Isolation
printouts. Other available supporting documents for the
DC1840 are the LTC4270/LTC4271 Layout Guide and the
LTC4271 PSE Demo Software Users Manual.
LTC4270B
The DC1682B has increased surge protection over the
DC1682A. 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.
LTC4270/LTC4271
Rev E
1

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Summary of Contents for Analog Devices DC1840C

  • Page 1 DC1682B and DC1680B LTC4270/LTC4271 12-Port PSE with Digital Isolation DESCRIPTION Demonstration kit DC1840C is a 12-port Ethernet Alliance™ printouts. Other available supporting documents for the certified IEEE 802.3at Type 2 power sourcing equipment DC1840 are the LTC4270/LTC4271 Layout Guide and the (PSE) composed of a DC1682B daughter card and DC1680B LTC4271 PSE Demo Software Users Manual.
  • Page 2 DEMO MANUAL DC1840C QUICK START PROCEDURE Demonstration kit DC1840C includes the DC1682 4. On the DC1680, connect a supply with the positive daughter card and DC1680 mother board. The kit is set rail to POS and negative rail to NEG (Figure 3). Use a up for evaluating the LTC4270/LTC4271.

  • Page 3: Quick Start Procedure

    DEMO MANUAL DC1840C QUICK START PROCEDURE Figure 1. DC1682 Backside. Setting AUTO and MID Jumpers www.analog.com Figure 2. Inserting the DC1682 into J1 of the DC1680 Rev E...
  • Page 4 DEMO MANUAL DC1840C QUICK START PROCEDURE (408) 432-1900 www.analog.com Figure 3. DC1840 Basic Setup Figure 4. System Setup with the DC590, DC1680, DC1682 and 55V Power Supply Rev E...

  • Page 5: Demonstration Circuit 1682B Operation

    DEMO MANUAL DC1840C DEMONSTRATION CIRCUIT 1682B OPERATION 12-Port PSE Daughter Card with Digital Isolation proprietary dual mode 4-point detection mechanism ensur- ing excellent immunity from false PD detection. Midspan Demonstration circuit 1682B (Figure 5) features the PSEs are supported with 2-event classification and a two LTC4270/LTC4271 chipset on a compact daughter card second backoff timer.
  • Page 6 DEMO MANUAL DC1840C DEMONSTRATION CIRCUIT 1682B OPERATION Board Layout Isolation and Power Supplies Proper board layout is crucial for proper LTC4270/LTC4271 The LTC4270/LTC4271 chipset provides communication chipset operation, robustness, and accuracy. When lay- across an isolation barrier through a data transformer ing out, pay attention to parts placement, Kelvin sensing, (Figure 6).
  • Page 7 DEMO MANUAL DC1840C DEMONSTRATION CIRCUIT 1682B OPERATION C Communication and Addressing AGND The LTC4271 internal registers are accessed via I C to read and/or write configuration, status, and interrupt registers. The I C lines SDAOUT, SDAIN and SCL connect to the 34-pin connector (Figure 7).
  • Page 8 DEMO MANUAL DC1840C DEMONSTRATION CIRCUIT 1682B OPERATION AUTO and MID Jumpers Surge Protection The AUTO and MID pins of the LTC4271 are set by Ethernet ports can be subject to significant cable surge jumpers JP1 and JP2 respectively on the DC1682B events.

  • Page 9: Demonstration Circuit 1680B Operation

    DGND is a negative voltage referenced to AGND. If an DC1680B, verify all supplies and LEDs are off. Push the external 3.3V supply is to be used, contact Analog Devices card straight down for insertion or pull straight up for Applications for proper connection.
  • Page 10 DEMO MANUAL DC1840C DEMONSTRATION CIRCUIT 1680B OPERATION MSD and RESET Pushbuttons Pushbutton switch SW2 when pressed pulls the maskable shutdown input (MSD) pin of the daughter card logic low. Pushbutton switch SW1, when pressed, pulls the RESET When pressed, all ports that have their corresponding mask pin of the daughter card logic low.
  • Page 11 DEMO MANUAL DC1840C DEMONSTRATION CIRCUIT 1680B OPERATION Interrupt LED Port 1 Through 12 Power LED Indicators A red LED indicates when the INT line is pulled logic low Each PSE port has a green LED indicator to show when by the daughter card. When the interrupt is cleared (high) PoE power is present at the port.

  • Page 12: Demonstration Circuit 1840 System

    DEMO MANUAL DC1840C DEMONSTRATION CIRCUIT 1840 SYSTEM DC1840 System Setup with a 14-pin ribbon cable to the DC1680 and to a PC via USB. On the PC, a GUI communicates with the board. At Figure 14 shows a basic DC1840A system setup. The the PSE output, PDs are connected.

  • Page 13: Demonstration Circuit 1682B Layout

    DEMO MANUAL DC1840C DEMONSTRATION CIRCUIT 1682B LAYOUT Top Assembly www.analog.com Layer 1: Top Layer Layer 2: V Plane 1 Rev E...
  • Page 14 DEMO MANUAL DC1840C DEMONSTRATION CIRCUIT 1682B LAYOUT Layer 3: V Plane 2 Layer 4: Bottom Layer Bottom Assembly Rev E...

  • Page 15: Demonstration Circuit 1680B Layout

    DEMO MANUAL DC1840C DEMONSTRATION CIRCUIT 1680B LAYOUT Top Assembly (408) 432-1900 www.analog.com Rev E...
  • Page 16 DEMO MANUAL DC1840C DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 1: Top Layer Rev E...
  • Page 17 DEMO MANUAL DC1840C DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 2: AGND, CGND Plane 1 Rev E...
  • Page 18 DEMO MANUAL DC1840C DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 3: SIG, AGND, CGND Plane 2 Rev E...
  • Page 19 DEMO MANUAL DC1840C DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 4: SIG, AGND, CGND Plane 3 Rev E...
  • Page 20 DEMO MANUAL DC1840C DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 5: SIG, AGND, CGND Plane 4 Rev E...
  • Page 21 DEMO MANUAL DC1840C DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 6: Bottom Layer Rev E...
  • Page 22 DEMO MANUAL DC1840C DEMONSTRATION CIRCUIT 1680B LAYOUT Bottom Silkscreen Rev E...

  • Page 23: Dc1682B Schematic Diagram

    DEMO MANUAL DC1840C DC1682B SCHEMATIC DIAGRAM 2mm, 34 Pin Connector 2mm, 34 Pin Connector Rev E...
  • Page 24 DEMO MANUAL DC1840C DC1680B SCHEMATIC DIAGRAM Rev E...
  • Page 25 DEMO MANUAL DC1840C DC1680B SCHEMATIC DIAGRAM Rev E...
  • Page 26 DEMO MANUAL DC1840C DC1680B SCHEMATIC DIAGRAM Rev E...

  • Page 27: Dc1680B Schematic Diagram

    Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
  • Page 28 Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY.

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