Rainbow Electronics MAX5971B - Manual (Page 39)

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MAX5971B
Single-Port, 40W, IEEE 802.3af/at,
PSE Controller with I 2 C
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
register is set to a default value of 0x00h. The MAX5971B
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]