MIC2342-2YTQ Micrel Inc, MIC2342-2YTQ Datasheet - Page 23

• Manufacturer Part Number: MIC2342-2YTQ
• Description: Dual -Slot PCI Express Hot-Plug Controller
• Manufacturer: Micrel Inc
• Type: Hot-Swap Controllerr

Specifications of MIC2342-2YTQ

• Applications: General Purpose, PCI Express
• Internal Switch(s): No
• Voltage - Supply: 3.3V, 12V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-TQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-2993

Thermal Shutdown
The internal VAUX[A/B] MOSFETs are protected against
damage
overtemperature
overcurrent condition on either VAUX[A] or VAUX[B]
raise the junction temperature of the MIC2342 to 140°C,
all of the outputs for that corresponding slot (including
VAUX) will be shut off and that slot’s /FAULT_AUX
output will be asserted. The slot’s /FAULT_MAIN output
will not be asserted. The other slot’s operating condition
will remain unaffected. However, should the MIC2342’s
die
overcurrent fault condition on both VAUX[A] and
VAUX[B], both slots (all outputs, including VAUXA and
VAUXB)
/FAULT_AUX[A/B] output signals will be asserted; the
/FAULT_MAIN[A/B] output signals will not be asserted.
Plug-in Card Retention Switch Inputs
Two pins on the MIC2342 are available for use as card
retention switch inputs, /CRSW[A/B]. These pins are
internally pulled-up by 45kΩ resistors to VSTBY and
prevent the enabling of all gate drive circuits on
12GATE[A/B], 3VGATE[A/B], and VAUX[A/B] unless
these input pins are asserted LOW. In addition, each of
Micrel, Inc.
June 2008
temperature
not
will
only
be
protection
exceed
shut
Figure 7. MIC2342R Auto-Retry Timing Diagram and Operation in Current-limit
by
off.
current
160°C
as
In
well.
limiting,
this
because
Should
case,
but
of
both
an
an
by
23
these inputs exhibits an internal debounce delay time of
approximately 10ms.
/FORCE_ON[A/B] Inputs
These level sensitive, asserted active-low digital inputs
are internally pulled up to VSTBY through a weak
current source and are intended for diagnostics during
the debug phase of the system design involving the
MIC2342. In asserting /FORCE_ON[A/B] LOW, all three
of the respective slot’s outputs (+12V, +3.3V, and VAUX)
will turn on. However, all protections for those outputs
are disabled. This explicitly includes all overcurrent and
short circuit protections, and on-chip thermal protection
for the VAUX supplies. Additionally, asserting a slot’s
/FORCE_ON[A/B] input will disable all of its input and
output UVLO protections, with the sole exception of that
asserting either or both of the /FORCE_ON[A/B] inputs
will not disable the VSTBY[A/B] input UVLO.
Asserting
respective slot’s /PWRGD[A/B], and /DLY_PWRGD[A/B]
output
/FAULT_MAIN[A/B], the /FAULT_AUX[A/B},
and the SYSPWRGD output signals to enter their open-
drain state.
signals
/FORCE_ON[A/B]
to
be
asserted
LOW
LOW
MIC2342/2342R
will
M9999-062008-B
cause
while
the /INT,
the
the