3

dc2583af

DEMO MANUAL DC2583A

Quick start proceDure

Power Over Ethernet (PoE) Input

1. Disconnect auxiliary supply if it is connected to AUX+

and AUX– inputs of the DC2583A.

2. Refer to Figure 3 to evaluate the DC2583A with a

DC/DC converter. If a resistive or an active load is

used to evaluate the DC2583A, use the setup diagram

as shown in Figure 4.

3. Default class shunt positions are at JP1 and JP2 on

the DC2583A board. Choose a power level from Table

1 and select the corresponding shunt positions.

Table 1. Single-Signature Classification Codes, Power

Levels and Jumper Selection

PD CLASS

ALLOCATED CLASS

POWER AT THE PD INPUT

RCLASS JUMPERS

0*

13W

JP1

JP2

1

3.84W

JP3

JP4

2

6.49W

JP5

JP6

3

13W

JP7

JP8

4

25.5W

JP9

JP10

5

40W

JP11

JP12

6

51W

JP13

JP14

7

62W

JP15

JP16

8

71W

JP17

JP18

*Class 0 is not defined for 802.3bt PDs.

4. Connect the output of the IEEE 802.3bt compliant PSE

(see note) to the RJ45 connector (J1) of the DC2583A

using a CAT5e or CAT6 Ethernet cable.

5. After connection has been established, verify that the

LED (D3) is lit. This indicates the PSE has successfully

detected and powered the PD.

6. Verify T2P response with a digital multimeter or an

oscilloscope. The T2P response for the type of PSE

connected to the DC2583A is provided in Table 2.

Note: An 802.3bt PSE has not yet been released. In

may be used to provide power to the DC2583A. The

LTPoE++ classification will not be 802.3bt compli-

ant, but the PSE will provide a compatible detection

and power output. Specifically, the T2P output of

the DC2583A is different from the behavior stated in

Table 2 and will indicate connection to a Type 2 PSE.

Otherwise PD behavior will be unaffected.

Table 2. T2P Response

PSE

T2P RESPONSE

NEGOTIATED PD

INPUT POWER

IEEE

Logic High

13W

Logic Low

25.5W

50% Logic High/50% Logic Low,

Toggle at 840Hz (typical)

51W

75% Logic High/25% Logic Low,

Toggle at 840Hz (typical)

71W

LTPoE++, 90W

Logic Low

71W