MIC2590B_08 Datasheet, PDF (5/23 Pages) Micrel Semiconductor – Dual-Slot PCI Hot Plug Controller

Micrel, Inc.
MIC2590B
Pin Number
1, 36
2, 35
37
48
47
39, 40, 41
4, 38
46
Pin Name
/FAULTA, /FAULTB
CFILTERA, CFILTERB
/INT
SDA
SCL
A2, A1, A0
GPIA, GPIB
GND
Pin Function
Open Drain, Active-Low: Asserted whenever the circuit breaker trips due to a
fault condition.
/FAULT[A/B] is reset by bringing the faulted slot’s ON pin low if /FAULT was
asserted in response to a fault condition on one of the slot’s MAIN outputs(+12V,
+5V, +3.3V, or –12V).
/FAULT[A/B] is reset by bringing the faulted slot’s AUXEN pin low if /FAULT was
asserted in response to a fault condition on the slot’s VAUX output.
If a fault condition occurred on both the MAIN and AUX outputs of the same slot,
then both ON and AUXEN must be brought low to de-assert the /FAULT output.
Filter Capacitor [A/B]: Capacitors connected between these pins and ground set
the duration of t_FLT. t_FLT is the amount of time for which a slot remains incurrent-
limit before its circuit breaker is tripped.
Interrupt Output: Open Drain, Active-low. Asserted whenever a power faulti s
detected. Cleared by writing a logic 1 to the respective active bit into the Status
Register.
SMBus Data: Bidirectional SMBus data line.
SMBus Clock: Input.
SMBus Address Select pins: Connect to ground or leave open in order to
program device SMBus base address. There is an internal pull-up to VSTBY on
each of these inputs.
General Purpose Inputs: The state of these inputs are available by reading the
Common Status Register.
Ground
September 2008
5
M9999-091808