max5957letnt Maxim Integrated Products, Inc., max5957letnt Datasheet - Page 19

• Manufacturer Part Number: max5957letnt
• Description: Triple Pci Express, Hot-plug Controllers
• Manufacturer: Maxim Integrated Products, Inc.

Figure 6. Fault Management Flowchart
Y
N
AUXON_ TOGGLED
RESET FAULT_
HIGH ≥ LOW ≥ HIGH
PRES_DET IS LOW
HIGH ≥ LOW
3.3VAUXIN IS OK,
AUXON_ IS HIGH,
LATCH-OFF
ON_ AND
OPTION?
ON_ TOGGLED
≥ HIGH
LATCH-OFF
OPTION?
Y
N
Y
Y
FAULT_ AND PWRGD_ ARE
______________________________________________________________________________________
N
Triple PCI Express, Hot-Plug Controllers
AUXILIARY OUTPUT.
RESET FAULT_
HIGH IMPEDANCE
N
POWER ON
SHUT DOWN ALL OUTPUTS.
Y
ASSERT FAULT_.
STAY WAITING
FOR t
STILL PRESENT?
MAIN INPUTS ARE
t
OK, ON_ IS HIGH
FAULT
RESTART
FAULT
N
ELAPSED?
N
N
MOSFET DRIVING 3.3AUXO_.
INTERNAL AUXILIARY
START COUNTING t
ENABLE CHARGE ON
Y
Y
Y
STILL PRESENT?
t
FAULT
START COUNTING
SU
RESET t
COUNTER
FAULT
ELAPSED?
t
FAULT
N
N
FAULT
ON 3.3G_ AND 12G_.
ENABLE CHARGE
RESET PWRGD_
START PGOOD
COUNTING t
MONITORING
THRESHOLD
12V AND 3.3V OUTPUTS.
START
STAY WAITING FOR
ASSERT FAULT_
SHUT DOWN
t
SU
RESTART
Y
Y
OR 3.3V OUTPUTS
FAULT ON 12V
START COUNTING
ELAPSED?
t
SU
t
N
FAULT
N
THRESHOLDS
ALL PGOOD
REACHED?
N
RESET t
Y
COUNTER
FAULT
Y
NO FAULT DETECTED
Y
AUX OUTPUT OK?
MAIN OUTPUTS OK?
N
ELAPSED?
DETECTED
NO FAULT
ARE ALL
t
ASSERT PWRGD_
SU
AFTER t
Y
N
N
N
DELAY
POR_HL
FAULT ON 3.3AUXO_?
Y
Y
19