MAX5952CUAX+【PDF 33/50 页】IC PSE CNTRLR FOR POE 36-SSOP

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Sheet目录43

29页 30页 31页 32页 [33页]34页 35页 36页 37页

High-Power, Quad, PSE Controller

for Power-Over-Ethernet

______________________________________________________________________________________ 33

Setting DET_EN_/CLASS_EN_ to 1 (Table 18) enables

load detection/classification, respectively. Detection

always has priority over classification. To perform clas-

sification without detection, set the DET_EN_ bit low

and CLASS_EN_ bit high.

In manual mode, R14h works like a pushbutton. Set the

bits high to begin the corresponding routine. The bit

clears after the routine finishes.

When entering auto mode, R14h defaults to FFh. When

entering semi or manual modes, R14h defaults to 00h.

A reset or power-up sets R14h = AAAAAAAAb where A

represents the latched-in state of the AUTO input prior

to the reset.

Table 18. Detection and Classification Enable Register

ADDRESS = 14h

SYMBOL

BIT

R/W

DESCRIPTION

CLASS_EN4

R/W

Enable classification on port 4

CLASS_EN3

R/W

Enable classification on port 3

CLASS_EN4

R/W

Enable classification on port 2

CLASS_EN3

R/W

Enable classification on port 1

DET_EN4

R/W

Enable detection on port 4

DET_EN3

R/W

Enable detection on port 3

DET_EN2

R/W

Enable detection on port 2

DET_EN1

R/W

Enable detection on port 1

Table 19. Backoff and High-Power Enable Register

ADDRESS = 15h

SYMBOL

BIT

R/W

DESCRIPTION

BCKOFF4

R/W

Enable cadence timing on port 4

BCKOFF3

R/W

Enable cadence timing on port 3

BCKOFF2

R/W

Enable cadence timing on port 2

BCKOFF1

R/W

Enable cadence timing on port 1

CL_DISC (R17h[2]) and ENx_CL6 (R1Ch[7:4]) are used

to program the high-power mode. See Table 3 for details.

Setting BCKOFF_ to 1 (Table 19) enables cadence tim-

ing on each port where the port backs off and waits

2.2s after each failed load discovery detection. The

IEEE 802.3af standard requires a PSE that delivers

power through the spare pairs (midspan PSE) to have

cadence timing.

A reset or power-up sets R15h = 0000XXXXb where X

is the logic AND of the MIDSPAN and AUTO inputs.

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