MIC2592B 查看數據表（PDF） - Micrel

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MIC2592B

Dual-Slot PCI Express Hot-Plug Controller

Micrel 

MIC2592B

Pin Description (continued)

Pin Number

Pin Name

39

A2

40

A1

41

A0

48

SDA

47

SCL

37

/INT

17

GND

33

46

20

RFILTER[A&B]

7

NC

18

19

30

Micrel

Pin Function

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.

3 Pins, IC Ground Connections: Tie directly to the system’s analog GND

plane directly at the device.

Connecting this pin to GND through a 110kΩ, 1% resistor will provide a

significant improvement in timeout duration accuracy for slow overcurrent

faults on Slot A and Slot B. If left floating (NC), overcurrent timeout duration

accuracy is determined by the specification for VFILTER and IFILTER. Please

see the “Circuit Breaker Function” text in the “Functional Description” section

for more detail.

Reserved: Make no external connections to these pins.

March 2005

6

M9999-033105

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