max5954aetxt Maxim Integrated Products, Inc., max5954aetxt Datasheet - Page 18

• Manufacturer Part Number: max5954aetxt
• Description: Max5954 Single Pci Express, Hot-plug Controller
• Manufacturer: Maxim Integrated Products, Inc.

Single PCI Express, Hot-Plug
Controller
Figure 6. Fault Management Flow Chart
18
______________________________________________________________________________________
STAY WAITING FOR BOTH
HIGH->LOW->HIGH
STAY WAITING FOR
HIGH->LOW->HIGH
AND ABOVE UVLO
ON_ TRANSITION
3.3AUXIN IS ON
ON AND AUXON
TRANSITION
LATCH-OFF
OPTION?
Y
Y
STAY WAITING FOR
t
RESTART
ASSERT FAULT,
ALL OUTPUTS,
SHUT DOWN
12V AND 3.3V OUTPUTS.
N
STAY WAITING FOR
ASSERT FAULT
ELAPSED.
SHUT DOWN
LATCH-OFF
t
OPTION?
RESTART
RESTART ALL SUPPLIES
RESET FAULT
AND
HIGH IMPEDANCE
POWER-ON MAIN
SUPPLIES FAULT
AND PWRGD ARE
Y
N
POWER-ON AUXILIARY
Y
HIGH IMPEDANCE
AND PWRGD ARE
SUPPLIES FAULT
IS FAULT STILL
ELAPSED?
PRESENT?
IS t
N
N
IS FAULT STILL
FAULT
HAS t
ELAPSED?
PRESENT?
N
N
FAULT
RESTART 12V, 3.3V
RESET FAULT
SUPPLIES
AND
Y
Y
INTERNAL AUXILIARY
START COUNTING
ENABLE CHARGE ON
START COUNTING
ENABLE CHARGE ON
MOSFET, BEGIN
COUNTING t
COUNTING t
12G AND 3.3G
t
PINS. START
FAULT
t
FAULT
SU
AFTER t
SU
THRESHOLDS
RESET t
ARE PWRGD
REACHED?
COUNTER
ASSERT
PWRGD
POR_HL
Y
Y
FAULT
Y
DELAY
RESET t
COUNTER
LIMIT DETECTED ON ANY
DETECTED ON AUXILIARY
FAULT
WAS CURRENT LIMIT
WAS CURRENT
3.3V OUTPUT?
N
12V OR
OUTPUT?
N
N
AFTER t
HAS t
ELAPSED?
HAS t
PWRGD
RESET
POR_LH
SU
N
SU
ELAPSED?
N
DELAY
Y
AUX SUPPLY OUTPUT
Y
12V AND 3.3V
ARE ENABLED
IS ENABLED
OUTPUTS