Rainbow-electronics MAX5965B Manual do Utilizador descarregar pdf (Página 32)

MAX5965A/MAX5965B

High-Power, Quad, Monolithic, PSE Controllers

for Power over Ethernet

32 ______________________________________________________________________________________

PGOOD_ is set to 1 (Table 14) at the end of the power-

up startup period if the power-good condition is met (0

< (V

OUT

- V

)< PG

). The power-good condition

must remain valid for more than t

PGOOD

to assert

PGOOD_. PGOOD_ is reset to 0 whenever the output

falls out of the power-good condition. A fault condition

immediately forces PGOOD_ low.

PWR_EN_ is set to 1 when the port power is turned on.

PWR_EN resets to 0 as soon as the port turns off. Any

transition of PGOOD_ and PWR_EN_ bits set the corre-

sponding bit in the power event registers R02h/R03h

(Table 8). A reset sets R10h = 00h.

Table 14. Power Status Register

ADDRESS = 10h

SYMBOL BIT R/W

DESCRIPTION

PGOOD4 7 R Power-good condition on port 4

PGOOD3 6 R Power-good condition on port 3

PGOOD2 5 R Power-good condition on port 2

PGOOD1 4 R Power-good condition on port 1

PWR_EN4 3 R Power is enabled on port 4

PWR_EN3 2 R Power is enabled on port 3

PWR_EN2 1 R Power is enabled on port 2

PWR_EN1 0 R Power is enabled on port 1

Table 15. Address Input Status Register

ADDRESS = 11h

SYMBOL BIT R/W

DESCRIPTION

Reserved 7 R Reserved

Reserved 6 R Reserved

A3 5 R Device address, A3 pin latched-in status

A2 4 R Device address, A2 pin latched-in status

A1 3 R Device address, A1 pin latched-in status

A0 2 R Device address, A0 pin latched-in status

MIDSPAN 1 R MIDSPAN input’s latched-in status

AUTO 0 R AUTO input’s latched-in status

A3, A2, A1, A0 (Table 15) represent the 4 LSBs of the

MAX5965A/MAX5965B address (Table 4). During a

reset, the device latches into R11h. These 4 bits

address from the corresponding inputs as well as the

state of the MIDSPAN and AUTO inputs. Changes to

those inputs during normal operation are ignored.

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 51 52

MAX5965A/MAX5965B 1

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