Micrel, Inc.
MIC2590B
September 2008
5
M9999-091808
Pin Number
Pin Name
Pin Function
1, 36
/FAULTA, /FAULTB
Open Drain, Active-Low: Asserted whenever the circuit breaker trips due to a
fault condition.
/FAULT[A/B] is reset by bringing the faulted slots ON pin low if /FAULT was
asserted in response to a fault condition on one of the slots MAIN outputs(+12V,
+5V, +3.3V, or 12V).
/FAULT[A/B] is reset by bringing the faulted slots AUXEN pin low if /FAULT was
asserted in response to a fault condition on the slots 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.
2, 35
CFILTERA, CFILTERB
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.
37
/INT
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.
48
SDA
SMBus Data: Bidirectional SMBus data line.
47
SCL
SMBus Clock: Input.
39, 40, 41
A2, A1, A0
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.
4, 38
GPIA, GPIB
General Purpose Inputs: The state of these inputs are available by reading the
Common Status Register.
46
GND
Ground
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