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DESCRIPTION
Demonstration kit DC1843B is an 8-port 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
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
with QuikEval™. This demonstration 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
BOARD PHOTO
8-Port PSE with Digital Isolation
LTC4290B
and
LTC4271
PSE
2
C interfacing
DEMO MANUAL DC1843B
DC1842B and DC1680B
LTC4290B/LTC4271
laying out the LTC4290B/LTC4271 circuit. Contact Linear
Technology 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 at
http://www.linear.com/demo/DC1843B
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.
dc1843bfa
1
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Summary of Contents for Linear Technology DC1842B
- Page 1 QuikEval™. This demonstration manual provides a Quick Start Procedure, a DC1842B overview, a DC1680B 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 overview, schematics, and layout printouts.
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Page 2: Quick Start Procedure
QUICK START PROCEDURE Demonstration kit DC1843B includes the DC1842B 3. Align pin 1 of the 30-pin male connector on the DC1842B daughter card and DC1680B motherboard. The kit is set with pin 1 of the 30-pin female connector on the DC1680B (Figure 2). - Page 3 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 dc1843bfa...
- Page 4 Also connected at J1 is the PoE V supply from the quick shutdown of preselected ports. PD discovery uses a motherboard and 8 PSE controlled outputs. Figure 5. DC1842B 8-Port PSE Daughter Card with Digital Isolation Features the LTC4290B and LTC4271 dc1843bfa...
- Page 5 All digital pins reside on the digital ground refer- follow the LTC4290B/LTC4271 Layout Guide document ence and are isolated from the analog PoE supply. A 3.3V when laying out the board. Contact Linear Technology supply for V and an isolated V supply are connected Corporation for this document.
- Page 6 AD6, AD3, AD2, AD1, and AD0 pins J2, PIN 10 XIO0 respectively. On the DC1842B, AD0 and AD1 are tied low with pull-down resistors. AD2, AD3 and AD6 are brought DC1843A F08 out to the 30-pin connector (Figure 7) and set with three switches on the DC1680B.
- Page 7 These S1B diodes are placed on the DC1680 mother board of the DC1843 kit. For quick PSE evaluation in AUTO pin mode with MIDSPAN disabled, set JP1 HI and JP2 LO on the DC1842B. 30-PIN CONNECTOR...
- Page 8 J1 to block off the unused pins when IEEE802.3at Type 1 and Type 2 PoE PSE motherboard in the DC1842B daughter card is inserted. the DC1843B kit. This board accepts various PSE daughter cards featuring Linear Technology PSE controllers. The DC1680B is capable of powering up to 8 PDs.
- Page 9 DEMO MANUAL DC1843B 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 10 DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B OPERATION Interrupt LED Port 1 Through 8 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 11 J1 on the DC1680B motherboard. A power supply is connected to V with banana cables. The DC590 connects Figure 14. DC1680B and DC1842B System Setup with Power Supply, DC590 and PD Demo Board Table 2. DC1843 Kit Versions VERSION...
- Page 12 DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1842B LAYOUT Top Assembly Layer 1: Top Layer dc1843bfa...
- Page 13 DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1842B LAYOUT Layer 2: V Plane 1 Layer 3: V Plane 2 dc1843bfa...
- Page 14 DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1842B LAYOUT Layer 4: Bottom Layer Bottom Assembly dc1843bfa...
- Page 15 DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Top Assembly dc1843bfa...
- Page 16 DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 1: Top Layer dc1843bfa...
- Page 17 DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 2: AGND, CGND Plane 1 dc1843bfa...
- Page 18 DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 3: SIG, AGND, CGND Plane 2 dc1843bfa...
- Page 19 DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 4: SIG, AGND, CGND Plane 3 dc1843bfa...
- Page 20 DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 5: SIG, AGND, CGND Plane 4 dc1843bfa...
- Page 21 DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Layer 6: Bottom Layer dc1843bfa...
- Page 22 DEMO MANUAL DC1843B DEMONSTRATION CIRCUIT 1680B LAYOUT Bottom Assembly dc1843bfa...
- Page 23 DEMO MANUAL DC1843B DC1842B SCHEMATIC DIAGRAM dc1843bfa...
- Page 24 DEMO MANUAL DC1843B DC1680B SCHEMATIC DIAGRAM dc1843bfa...
- Page 25 DEMO MANUAL DC1843B DC1680B SCHEMATIC DIAGRAM dc1843bfa...
- Page 26 DEMO MANUAL DC1843B DC1680B SCHEMATIC DIAGRAM dc1843bfa...
- 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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