DC2685B

DEMO MANUAL DC2685B DC2683A and DC2684A-B LTC4291-1/LTC4292 4-Port IEEE 802.3bt PSE DESCRIPTION Demonstration circuit 2685B is a 4-port IEEE802.3bt system using a single power supply. A DC590 is con- 2 power sourcing equipment (PSE) composed of a nected to the DC2685B for I C interfacing with QuikEval. DC2684A-B (daughter card) and DC2683A (mother- This demonstration manual provides a quick start proce- board). The DC2685B (kit) is used for evaluation of dure, a DC2684A-B daughter card overview, a DC2683A the LTC 4291-1/LTC4292 PSE chipset. Up to four mother board overview, schematics, and layout printouts. IEEE802.3af, IEEE802.3at, or IEEE802.3bt powered Design files for this circuit board are available. devices (PDs) can be connected and powered from this All registered trademarks and trademarks are the property of their respective owners. BOARD PHOTO Rev A 1DEMO MANUAL DC2685B QUICK START PROCEDURE Follow the quick start procedure below for basic operation sourcing the maximum delivered power for all four of the DC2685B kit. Refer to Figure 1 through Figure 3 ports set by JP3 and JP4 on the daughter card (or 2 and Table 1 through Table 4 for proper equipment setup. I C configured power). Ramp the supply up to within the recommended voltage range specified in Table 3. 1. On the DC2684A-B daughter card set AUTO jumper 2 JP1 (Figure 1) to a selected AUTO mode setting 6. Set the LTC4291-1/LTC4292 I C address switch SW1 shown in Table 1. on the motherboard to the one of the four addresses shown in Table 4. 2. On the DC2684A-B daughter card set 4PV jumper JP2 (Figure 1) to a selected 4-Pair Valid setting as 7. On the DC590, set the VCCIO jumper JP6 to 3.3V . shown in Table 1. (Refer to Table 5 and the DC590 demo manual for further instructions for the DC590.) 3. On the DC2684A-B daughter card set PM1 jumper JP4 and PM0 jumper JP3 (Figure 1) to the power 8. Connect the DC590 to the DC2683A at connector J6 mode for evaluation specified in Table 2. with a 14-pin ribbon cable as shown in Figure 3 and open the QuikEval GUI. A GUI for the LTC4291-1/ 4. Align pin 1 of the 30-pin male connector on the LTC4292 is brought up by QuikEval. (Follow the DC2684A-B daughter card with pin 1 of the 30-pin DC590 demo manual instructions if this has not been female connector on the DC2683A motherboard previously setup.) as shown in Figure 2. Pin 12 is polarized to assist with the alignment. Carefully push the daughter card 9. Connect up to four PDs to the DC2685B RJ45 con- straight down until the male and female 30-pin con- nector J1, bottom row ports 1-4 as shown in Figure nectors are flush with each other. 3. 5. Connect a supply to the motherboard with the posi- 10. Optionally a 1000BASE-T data source may be con- tive rail to AGND (+) and negative rail to V () as nected to the DC2685B RJ45 connector J1, top row EE shown in Figure 3. Use a power supply capable of ports 1-4 for data pass through testing. Rev A 2