Rainbow-electronics MAX5945 Manual do Utilizador descarregar pdf (Página 12)

MAX5945

Detailed Description

The MAX5945 four-port network power controller con-

trols -32V to -60V negative supply rail systems. Use the

MAX5945, which is compliant with the IEEE 802.3af

standard for PSE in power-over-LAN applications. The

MAX5945 provides PD discovery, classification, current

limit, both DC and AC load disconnect detections, and

other necessary functions for an IEEE 802.3af-compli-

ant PSE. The MAX5945 can be used in either endpoint

PSE (LAN switch/router) or midspan PSE (power injec-

tor) applications.

The MAX5945 is fully software-configurable and pro-

grammable with more than 25 internal registers. The

device features an I

C-compatible, 3-wire serial inter-

face and a class-overcurrent detection. The class-over-

current detection function enables system power man-

Quad Network Power Controller

for Power-Over-LAN

12 ______________________________________________________________________________________

50µA

90µA

100mA

MAX

FAST

DISCHARGE

CONTROL

212mV182mV

13V CLAMP

CURRENT-LIMIT

DETECTOR

4mV

OVERCURRENT

(OVC)

OPEN CIRCUIT

(OC)

CURRENT

LIMIT (ILIM)

PWR_EN

10V

VOLTAGE

SENSING

FOLDBACK

CONTROL

9-BIT ADC

CONVERTER

VOLTAGE PROBING

AND

CURRENT-LIMIT

CONTROL

CURRENT SENSING

SENSE_

GATE_

OUT_

DET_

A = 3

DETECTION

ACD_ENABLE

AC DISCONNECT

SIGNAL

(ACD)

ACD

REFERENCE

CURRENT

DETECTION/

CLASSIFICATION

PORT

STATE

MACHINE

(SM)

SERIAL

PORT

INTERFACE

(SPI)

AUTO

MIDSPAN

ANALOG

BIAS/

SUPPLY

MONITOR

AGND

+10V ANALOG

+5V DIG

VOLTAGE

REFERENCES

CURRENT

REFERENCES

CENTRAL LOGIC UNIT

(CLU)

DGNDOSC_INSCL SDAIN SDAOUT

OSCILLATOR

MONITOR

SHD_

RESET

INT

MAX5945

Figure 1. MAX5945 Functional Diagram

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 43 44

Quad Network Power Controller 1

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