MIC2593 Datasheet, PDF (6/26 Pages) STMicroelectronics – Dual-Slot PCI Hot Plug Controller

MIC2593
Pin Description (cont)
Pin Number
4
38
Pin Name
GPIA
GPIB
40
A1
41
A0
A0
48
SDA
47
SCL
37
/INT
33
GND
46
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 de-asserted 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 V_STBY.
IC Ground Connections: Tie directly to the system’s analog ground
plane directly at the device.
M9999-042204
6
April 2004