MAX5965AEAX+【PDF 37/54 页】IC PSE CTRLR FOR POE 36SSOP

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Sheet目录43

33页 34页 35页 36页 [37页]38页 39页 40页 41页

High-Power, Quad, Monolithic, PSE Controllers

for Power over Ethernet

______________________________________________________________________________________ 37

Setting CL_DISC to 1 (Table 21) enables port over class

current protection, where the MAX5965A/MAX5965B

scales down the overcurrent limit (V

FLT_LIM

) according

to the port classification status. This feature provides

protection to the system against PDs that violate their

maximum class current allowance.

The MAX5965 is programmed to switch to a high-power

configuration and HP_TIME is low, the higher current set-

ting is enabled only after a successful startup so that the

PD powers up as a normal 15W device. If HP_TIME is set

together with EN_HP_ALL, the higher current setting will

be active before startup. For Classes 4, 5, and 6, the

corresponding enable bit in register R15h must be set

together with EN_HP_ALL. In any other cases, the cur-

rent level defaults to Class 0.

CL_DISC, together with EN_HP_CL_ (R15h[6:4]),

EN_HP_ALL (R15h[7]), and ENx_CL6 (R1Ch[7:4]) are

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

details.

Setting OUT_ISO high (Table 21), forces DET_ to a

high-impedance state.

A reset sets R17h = 0xC0.

Table 21. Miscellaneous Configurations 1 Register

ADDRESS = 17h

SYMBOL

BIT

R/W

DESCRIPTION

INT_EN

R/W

A logic-high enables INT functionality

RSTR_EN

R/W

A logic-high enables the autorestart protection time off (as set by the RSTR[1:0] bits)

Reserved

POFF_CL

A logic-high prevents power-up after a classification failure (I > 50mA, valid only in AUTO

mode)

CL_DISC

R/W

A logic-high enables reduced current-limit voltage threshold (V

FLT_LIM

) according to port

classification result

OUT_ISO

R/W

Forces DET_ to high impedance. Does not interfere with other circuit operation.

HP_TIME

R/W

Enables high power after startup.

Table 22. Power-Enable Pushbuttons Register

ADDRESS = 19h

SYMBOL

BIT

R/W

DESCRIPTION

PWR_OFF4

A logic-high powers off port 4

PWR_OFF3

A logic-high powers off port 3

PWR_OFF2

A logic-high powers off port 2

PWR_OFF1

A logic-high powers off port 1

PWR_ON4

A logic-high powers on port 4

PWR_ON3

A logic-high powers on port 3

PWR_ON2

A logic-high powers on port 2

PWR_ON1

A logic-high powers on port 1

Power-enable pushbutton for semi and manual modes

is found in Table 22. Setting PWR_ON_ to 1 turns on

power to the corresponding port. Setting PWR_OFF_ to

1 turns off power to the port. PWR_ON_ is ignored when

the port is already powered and during shutdown.

PWR_OFF_ is ignored when the port is already off and

during shutdown. After execution, the bits reset to 0.

During detection or classification, if PWR_ON_ goes

high, the MAX5965A/MAX5965B gracefully terminate

the current operation and turn on power to the port. The

MAX5965A/MAX5965B ignore the PWR_ON_ in auto

mode. A reset sets R19h = 00h.

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