Quick Start Procedure - Analog Devices INEAR TECHNOLOGY DC2583A Demo Manual

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
ALLOCATED CLASS
PD CLASS POWER AT THE PD INPUT
0* 13W
1 3.84W
2 6.49W
3 13W
4 25.5W
5 40W
6 51W
7 62W
8 71W
*Class 0 is not defined for 802.3bt PDs.
DEMO MANUAL DC2583A
4. Connect the output of the IEEE 802.3bt compliant PSE
5. After connection has been established, verify that the
6. Verify T2P response with a digital multimeter or an
Note: An 802.3bt PSE has not yet been released. In
the interim, an LTPoE ++
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
RCLASS JUMPERS
and power output. Specifically, the T2P output of
JP1 JP2
the DC2583A is different from the behavior stated in
JP3 JP4
Table 2 and will indicate connection to a Type 2 PSE.
JP5 JP6
Otherwise PD behavior will be unaffected.
JP7 JP8
JP9 JP10
Table 2. T2P Response
JP11 JP12
JP13 JP14
JP15 JP16
JP17 JP18
(see note) to the RJ45 connector (J1) of the DC2583A
using a CAT5e or CAT6 Ethernet cable.
LED (D3) is lit. This indicates the PSE has successfully
detected and powered the PD.
oscilloscope. The T2P response for the type of PSE
connected to the DC2583A is provided in Table 2.
®
PSE T2P RESPONSE
Logic High
Logic Low
50% Logic High/50% Logic Low,
IEEE
Toggle at 840Hz (typical)
75% Logic High/25% Logic Low,
Toggle at 840Hz (typical)
LTPoE ++ , 90W
Logic Low
compliant PSE (DC1814A-D)
NEGOTIATED PD
INPUT POWER
13W
25.5W
51W
71W
71W
dc2583af
3