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MIC2591B Datasheet, PDF (6/34 Pages) Micrel Semiconductor – Dual-Slot PCI Express Hot-Plug Controller | |||
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MIC2591B
Pin Description (continued)
Pin Number
Pin Name
4
GPI_A0
38
GPI_B0
39
A2
40
A1
41
A0
48
SDA
47
SCL
37
/INT
17
GND
46
20
RFILTER[A&B]
7
NC
18
19
30
Micrel
Pin Function
General Purpose Inputs: The states of these two inputs are available by
reading the Common Status Register, Bits [4:5]. If not used, connect each
pin to GND.
SMBus Address Select Pins: Connect to ground or leave open in order to
program device SMBus base address. These inputs have internal pull-up
resistors to VSTBY[A/B].
SMBus Data: Bidirectional SMBus data line.
SMBus Clock: Input.
Interrupt Output: Open-drain, active-low. Asserted whenever a power fault
is detected if the INTMSK bit (CS Register Bit D[3]) is a logical "0". This
output is cleared by performing an "echo reset" to the appropriate fault bit(s)
in the STAT[A/B] and/or CS registers. This pin requires an external pull-up
resistor to VSTBY.
2 Pins, IC Ground Connections: Tie directly to the systemâs analog GND
plane directly at the device.
Connecting this pin to GND through a 110kΩ, 1% resistor will provide a
signiï¬cant improvement in timeout duration accuracy for slow overcurrent
faults on Slot A and Slot B. If left ï¬oating (NC), overcurrent timeout duration
accuracy is determined by the speciï¬cation for VFILTER and IFILTER. Please
see the âCircuit Breaker Functionâ text in the âFunctional Descriptionâ section
for more detail.
Reserved: Make no external connections to these pins.
March 2005
6
M9999-033105
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