Rainbow Electronics MAX5965B - Manual (Page 33)

MAX5965A/MAX5965B
High-Power, Quad, Monolithic, PSE Controllers
for Power over Ethernet
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Setting DCD_EN_ to 1 enables the DC load disconnect
detection feature (Table 17). Setting ACD_EN_ to 1
enables the AC load disconnect feature. If enabled, the
load disconnect detection starts during power mode and after startup when the corresponding PGOOD_ bit
in register R10h (Table 14) goes high. A reset sets
R13h = 0000AAAA where A represents the latched-in
state of the AUTO input prior to the reset.
Table 16a. Operating Mode Register
ADDRESS = 12h
SYMBOL BIT R/W
DESCRIPTION
P4_M1 7 R/W MODE[1] for port 4
P4_M0 6 R/W MODE[0] for port 4
P3_M1 5 R/W MODE[1] for port 3
P3_M0 4 R/W MODE[0] for port 3
P2_M1 3 R/W MODE[1] for port 2
P2_M0 2 R/W MODE[0] for port 2
P1_M1 1 R/W MODE[1] for port 1
P1_M0 0 R/W MODE[0] for port 1
Table 17. Load Disconnect Detection Enable Register
ADDRESS = 13h
SYMBOL BIT R/W
DESCRIPTION
ACD_EN4 7 R/W Enable AC disconnect detection on port 4
ACD_EN3 6 R/W Enable AC disconnect detection on port 3
ACD_EN2 5 R/W Enable AC disconnect detection on port 2
ACD_EN1 4 R/W Enable AC disconnect detection on port 1
DCD_EN4 3 R/W Enable DC disconnect detection on port 4
DCD_EN3 2 R/W Enable DC disconnect detection on port 3
DCD_EN2 1 R/W Enable DC disconnect detection on port 2
DCD_EN1 0 R/W Enable DC disconnect detection on port 1
Table 16b. Operating Mode Status
MODE DESCRIPTION
00 Shutdown
01 Manual
10 Semi-auto
11 Auto
The MAX5965A/MAX5965B use 2 bits for each port to
set the mode of operation. Set the modes according to
Table 16a and 16b. A reset sets R12h = AAAAAAAA where A represents
the latched-in state of the AUTO input prior to the reset.
Use software to change the mode of operation.
Software resets of ports (RESET_P_ bit, Table 23) do
not affect the mode register.