MAX5952CUAX+【PDF 41/50 页】IC PSE CNTRLR FOR POE 36-SSOP

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Sheet目录43

37页 38页 39页 40页 [41页]42页 43页 44页 45页

High-Power, Quad, PSE Controller

for Power-Over-Ethernet

______________________________________________________________________________________ 41

The MAX5952 provides current readout for each port

during classification and normal power mode. The cur-

rent per port information is separated into 9 bits. They

are organized into 2 consecutive registers for each one

of the ports. The information can be quickly retrieved

using the auto-increment option of the address pointer.

To avoid the LSB register changing while reading the

MSB, the information is frozen once the addressing

byte points to any of the current readout registers.

During power mode, the current value can be calculat-

ed as

PORT

= N

IPD_

x 1.953125mA

During classification, the current is

CLASS

= N

IPD_

x 0.0975mA

where N

IPD_

is the decimal value of the 9-bit word. The

ADC saturates both at full scale and at zero. A reset

sets R30hR37h = 00h.

Table 34c. ICUT Register Bit Values for Current-Limit Threshold

ICUT_[2:0] (ADDRESS = 2Ah, 2Bh)

SCALE FACTOR

TYPICAL CURRENT-LIMIT THRESHOLD (mA)

000

375

001

1.5x

563

010

1.75x

656

011

750

100

2.25x

844

101

2.5x

938

110

0.3x

Class 1

111

0.53x

Class 2

Table 35. Classification Status Registers

ADDRESS = 2Ch, 2Dh, 2Eh, 2Fh

SYMBOL

BIT

R/W

DESCRIPTION

Reserved

ADDRESS = 30h, 31h, 32h, 33h, 34h,

35h, 36h, 37h

SYMBOL

BIT

R/W

DESCRIPTION

IPD_[8]

IPD_[7]

IPD_[6]

IPD_[5]

IPD_[4]

IPD_[3]

IPD_[2]

IPD_

IPD_[1]/IPD_[0]

Table 36. Current Registers

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