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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