Rainbow-electronics MAX5958 Manual do Utilizador descarregar pdf (Página 16)

MAX5957/MAX5958

Triple PCI Express, Hot-Plug Controllers

16 ______________________________________________________________________________________

Table 2. Control Logic Truth Table

PRES-DET_ high-to-low transition has a 4ms delay (t

DEG

ON_ AUXON_ FON_ PRES-DET

12V_ AND 3.3V_

OUTPUTS

3.3VAUXO_AUXILIARY

OUTPUTS

X X Low X On On

X X High High Off Off

Low Low High Low* Off Off

High Low High Low* On Off

Low High High Low* Off On

High High High Low* On On

Figure 2. Power-Up Timing, No Fault

ON_,TH

ON_, AUXON_

PWRGD_

FAULT_

12G_, 3.3G_

12VO_, 3.3VO_

3.3VAUXO_

PGTH12

PGTH3.3

PGTH3.3AUX

3.3AUXIN

RISING

EDGE

PWRGD_ IS PULLED UP TO 3.3.

FAULT_ IS PULLED UP TO 3.3AUXIN.

POR_HL

Figure 3. 12V Power-Up Timing (Turn-On into Output

Overcurrent/Short Circuit)

FAULT_

3.3VAUXIN

RISING

EDGE

PWRGD_ IS PULLED UP TO 3.3VAUXO_.

FAULT_ IS PULLED UP TO 3.3VAUXIN.

A FAULT ON THE 3.3V OUTPUT OR 3.3VAUXO_ OUTPUT PRODUCES SIMILAR RESULTS.

ON_,TH

ON_

2 x t

FAULT

PWRGD_

12G_

12V OUTPUT

CURRENT

3.3VAUXO_

12ILIM,TH

SENSE

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 24 25

MAX5957/MAX5958 1

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