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OZ998

Intelligent Manager Smart PMU/GPIO

O2Micro International 

FEATURES

• SMBus, version 1.0, compliant

• Intel PAS Protected Storage support

• Support Pentium and x86-based designs

• Support SMBus Q-Buffering via PWRGD

• Support SMBus selector for dual/triple DIMMs

• 32KHZ input clock or Crystal input

• Support 2 different power planes

• 10 bytes scratch pad registers

• 20 possible edge-sensitive programmable GPIOs

per device

• 8 possible Open Drain, Open Collector outputs

• Programmable addresses for cascaded OZ998s

• Supports 3.3V or 5V operation

• Supports 5V tolerant LVTTL inputs (OZ998B)

• LOW power hardware-driven speaker alarm

outputs

• SMBALERT# and SMI event outputs

• 8 programmable interrupt inputs for SMI event or

SMBALERT#

• 8 Auto LED Flash (ALF) programmable outputs

with 10% or 50% duty cycles

ORDERING INFORMATION

OZ998S - 28 pin SSOP

OZ998

Intelligent Manager

Smart Multi-DIMM Selector

GENERAL DESCRIPTION

O2Micro’s OZ998 Multi-DIMM Selector supports the

switching between a primary SMBus and 3 other

secondary SMBus. This function is particularly useful

for DIMM devices and the support of Intel’s PAS

(Preboot Authentication Service).

In addition, the OZ998 can be configured to support

two different power planes with different sets of

General Purpose Input/Output (GPIO) signals, which

supplements and enhances the power management

capability of the chipsets, commonly found in an ACPI

(Advanced Configuration of Power Interface)

subsystem.

Up to 20 possible GPIOs are available per device,

and among those, GPIO[15:8] are programmable to

be either positive or negative-edged triggers to

generate an SMIEVENT/SMBALERT# to the system.

GPIO[7:0] are programmable to be either a regular

TTL level output, open drain or open collector output.

To support over 20 GPIOs through cascading multiple

OZ998 devices, configure each individual OZ998

device ID. Up to 8 Auto LED Flash (ALF) are available

to drive an LED or speaker at a programmable

frequency.

The OZ998 is packaged in a low profile, small 28 pin

SSOP.

07/13/00

©Copyright 2000 by O2Micro

OZ998-SF-2.2

All Rights Reserved

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