Rainbow-electronics MAX5965B Manual do Utilizador descarregar pdf (Página 41)

MAX5965A/MAX5965B

High-Power, Quad, Monolithic, PSE Controllers

for Power over Ethernet

______________________________________________________________________________________ 41

The three ICUT_ bits (Tables 34a and 34b) allow pro-

gramming of the current-limit and overcurrent thresholds

in excess of the IEEE 802.3af standard limit. The

MAX5965A/MAX5965B can automatically set the ICUT

(see Table 3).

Class 1 and 2 limits can also be programmed by soft-

ware independently from the classification status. See

Table 3. A reset or power-up sets R2Ah = R2Bh = 00h.

Table 32. Miscellaneous Configurations 2

ADDRESS = 29h

SYMBOL BIT R/W

DESCRIPTION

7 — Reserved

6 — Reserved

5 — Reserved

4 — Reserved

3 — Reserved

Reserved

2 — Reserved

1 R/W IVEE[1]

IVEE

0 R/W IVEE[0]

Table 34a. ICUT Registers 1 and 2

ADDRESS = 2Ah

SYMBOL BIT R/W

DESCRIPTION

Reserved 7 — Reserved

6 R/W ICUT2[2]

5 R/W ICUT2[1]

ICUT2

4 R/W ICUT2[0]

Reserved 3 — Reserved

2 R/W ICUT1[2]

1 R/W ICUT1[1]

ICUT1

0 R/W ICUT1[0]

Table 34b. ICUT Registers 3 and 4

ADDRESS = 2Bh

SYMBOL BIT R/W

DESCRIPTION

Reserved 7 — Reserved

6 R/W ICUT4[2]

5 R/W ICUT4[1]

ICUT4

4 R/W ICUT4[0]

Reserved 3 — Reserved

2 R/W ICUT3[2]

1 R/W ICUT3[1]

ICUT3

0 R/W ICUT3[0]

Table 33. Current-Limit Scaling Register

IVEE[1:0]

(ADDRESS = 29h)

CURRENT LIMIT

(%)

00 Default

01 -5

10 -10

11 -15

The IVEE bits enable the current-limit scaling (Table

32). This feature is used to reduce the current limit for

systems running at higher voltage to maintain the

desired output power. Table 33 sets the current-limit

scaling register. A reset or power-up sets R29h = 00h.

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 51 52

MAX5965A/MAX5965B 1

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