Rainbow-electronics MAX5971B Manual do Utilizador descarregar pdf (Página 39)

______________________________________________________________________________________ 39

MAX5971B

Single-Port, 40W, IEEE 802.3af/at,

PSE Controller with I

Table 36. ICUT Register

Table 37. ICUT Current-Limit Threshold Settings

Table 35. Miscellaneous Configurations 2 Register

Miscellaneous Configurations 2 Register (R29h)

The miscellaneous configurations 2 register (R29h, Table

35) is used to enable the load stability safety check (see

the PD Detection section). On a power-up or after a reset

condition, this register is set to a default value of 0x00h.

ICUT Register (R2Ah)

The ICUT register (R2Ah, Table 36) is used to adjust

the device current limit and corresponding overcurrent

thresholds. On a power-up or after a reset condition, this

can automatically set the ICUT register (see Table 4) or

ICUT[2:0] can be manually written to by the software

(see Table 37) to manually adjust the current-limit and

overcurrent thresholds.

ICUT_[2:0]

TYPICAL CURRENT-LIMIT THRESHOLD

(mA)

TYPICAL OVERCURRENT THRESHOLD

(mA)

000 420 370

001 720 634

010, 011, 100 Not Used Not Used

101 850 748

110 900 792

111 950 836

ADDRESS = 29h

DESCRIPTION

SYMBOL BIT NO. R/W

Reserved 7 — Reserved

Reserved 6 — Reserved

Reserved 5 — Reserved

LSC_EN 4 R/W Enables the load stability safety check

Reserved 3 R/W

Internally connected. For a write command, always write a zero to this bit.

Reserved 2 R/W

Reserved 1 — Reserved

Reserved 0 — Reserved

ADDRESS = 2Ah

DESCRIPTION

SYMBOL BIT NO. R/W

Reserved 7 — Reserved

Reserved 6 — Reserved

Reserved 5 — Reserved

Reserved 4 — Reserved

Reserved 3 — Reserved

ICUT

2 R/W ICUT[2]

1 R/W ICUT[1]

0 R/W ICUT[0]

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 45 46

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