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Description
Demonstration kit DC1840A is a 12-port Type 2 power
sourcing equipment (PSE) composed of a DC1682A
daughter card and DC1680A mother board. The kit is used
for evaluation of the LTC4270B 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 DC1680A for I
with QuikEval™. This demonstration manual provides a
Quick Start Procedure, a DC1682A overview, a DC1680A
BoarD photo
DEMO MANUAL DC1840A
DC1682A and DC1680A
12-Port PSE with Digital Isolation
overview, schematics, BOMs, and layout printouts. Other
available supporting documents for the DC1840A are the
LTC4270/LTC4271 Layout Guide and the LTC4271 PSE
Demo Software Users Manual.
Design files for this circuit board are available at
http://www.linear.com/demo
2
C interfacing
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.
LTC4270/LTC4271
dc1840afb
1
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Summary of Contents for Linear Technology DC1840A
- Page 1 A DC590 is connected to the DC1680A for I C interfacing L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and with QuikEval™. This demonstration manual provides a QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property Quick Start Procedure, a DC1682A overview, a DC1680A of their respective owners.
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Page 2: Quick Start Procedure
DEMO MANUAL DC1840A Quick start proceDure Demonstration kit DC1840A includes the DC1682A alignment. Carefully push the DC1682A straight down daughter card and DC1680A mother board. The kit is set until the two 34-pin connectors are flush with each other. up for evaluating the LTC4270/LTC4271. Follow the pro- 4. - Page 3 DEMO MANUAL DC1840A Quick start proceDure Figure 3. DC1680A Basic Setup Figure 4. System Setup with the DC590, DC1680A, DC1682A and 55V Power Supply dc1840afb...
- Page 4 DEMO MANUAL DC1840A Demonstration circuit 1682a 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 1682A (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 5 DEMO MANUAL DC1840A Demonstration circuit 1682a 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 6 DEMO MANUAL DC1840A Demonstration circuit 1682a 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 7 DEMO MANUAL DC1840A Demonstration circuit 1682a operation AUTO and MID Jumpers S1B Diodes Port Protection The AUTO and MID pins of the LTC4271 are set by Ethernet ports can be subject to significant ESD events jumpers JP1 and JP2 respectively on the DC1682A when long data cables, each potentially charged to thou- (Figure 10).
- Page 8 When inserting or removing the daughter card into the is a negative voltage referenced to AGND. If an external DC1840A, verify all supplies and LEDs are off. Push the 3.3V supply is to be used, contact Linear Technology Ap- card straight down for insertion or pull straight up for plications for proper connection.
- Page 9 DEMO MANUAL DC1840A Demonstration circuit 1680a 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 10 DEMO MANUAL DC1840A Demonstration circuit 1680a operation Interrupt LED DC1680A System Setup A red LED indicates when the INT line is pulled logic low Figure 14 shows a basic DC1680A system setup. The by the daughter card. When the interrupt is cleared (high)
- Page 11 DEMO MANUAL DC1840A Demonstration circuit 1680a operation Figure 14. DC1680A and DC1682A System Setup with Power Supply, DC590 and PD Demo Board dc1840afb...
- Page 12 DEMO MANUAL DC1840A Demonstration circuit 1682a Layout Top Silkscreen Layer 1: Top Layer Layer 2: V Plane 1 dc1840afb...
- Page 13 DEMO MANUAL DC1840A Demonstration circuit 1682a Layout Layer 3: V Plane 2 Layer 4: Bottom Layer Bottom Silkscreen dc1840afb...
- Page 14 DEMO MANUAL DC1840A Demonstration circuit 1680a Layout Top Silkscreen dc1840afb...
- Page 15 DEMO MANUAL DC1840A Demonstration circuit 1680a Layout Layer 1: Top Layer dc1840afb...
- Page 16 DEMO MANUAL DC1840A Demonstration circuit 1680a Layout Layer 2: AGND, CGND Plane 1 dc1840afb...
- Page 17 DEMO MANUAL DC1840A Demonstration circuit 1680a Layout Layer 3: SIG, AGND, CGND Plane 2 dc1840afb...
- Page 18 DEMO MANUAL DC1840A Demonstration circuit 1680a Layout Layer 4: SIG, AGND, CGND Plane 3 dc1840afb...
- Page 19 DEMO MANUAL DC1840A Demonstration circuit 1680a Layout Layer 5: SIG, CGND, CGND Plane 4 dc1840afb...
- Page 20 DEMO MANUAL DC1840A Demonstration circuit 1680a Layout Layer 6: Bottom Layer dc1840afb...
- Page 21 DEMO MANUAL DC1840A Demonstration circuit 1680a Layout Bottom Silkscreen dc1840afb...
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Page 22: Parts List
RES, CHIP, 27k, 1/8W, 5% 0805 R32, R33 RES, CHIP, 1k, 1/16W, 5% 0603 TRANSFORMER, ETHERNET, 10/100 MIDCOM WURTH, 7490100143 IC, DIGITAL PSE CONTROLLER 24-LEAD 4mm × 4mm QFN LINEAR TECHNOLOGY, LTC4271IUF#TRPBF IC, 12-PORT PSE CONTROLLER 52-LEAD 7mm × 8mm QFN LINEAR TECHNOLOGY, LTC4270BIUKG#TRPBF STENCIL... - Page 23 DEMO MANUAL DC1840A parts List DC1680A ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components J7, J8 JACK BANANA KEYSTONE, 575-4 CAP, ALUM, 47µF, 100V H13 size PANASONIC, EEEFK2A470AQ C2, C13, C14 CAP, X7R, 0.1µF 25V, 10% 0603 AVX, 06033C104KAT2A C3, C11, C12 CAP, X7R, 1µF 16V, 10% 0603...
- Page 24 DEMO MANUAL DC1840A parts List DC1680A ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER R18, R19 RES, CHIP, 0, 1/16W, 0603 VISHAY, CRCW06030000Z0EA R20, R21 RES, CHIP, 1k, 1/8W, 5%, 0805 AAC, CR10-102JM R22, R23 (OPT) RES, 0805 SW1, SW2 SWITCH, PUSH BOTTOM WÜRTH, 434123050816...
- Page 25 DEMO MANUAL DC1840A Dc1682a schematic Diagram 2mm, 34 Pin Connector 2mm, 34 Pin Connector dc1840afb...
- Page 26 DEMO MANUAL DC1840A Dc1680a schematic Diagram 2MM, 34 PIN CONNECTOR 2MM, 34 PIN CONNECTOR dc1840afb...
- Page 27 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
- Page 28 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.
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