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Details, datasheet, quote on part number:OZ998
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Datasheet text preview:
OZ998
Short Form Datasheet Intelligent Manager
Smart Multi-DIMM Selector FEATURES
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SMBus, version 1.1, 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
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.
ORDERING INFORMATION
OZ998S 28-pin SSOP
10/16/02 Copyright © 2000-02 by O2Micro
OZ998-SF-2.5 All Rights Reserved
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OZ998
PIN DIAGRAM
OZ998
P_SMBCLK P_SMBDATA PWRGD RESET# GPIO[16]/S_SMBCLK1 GPIO[17]/S_SMBDATA1 GPIO[18]/S_SMBCLK2 GPIO[19]/S_SMBDATA2 GPIO[0]/SMIEVENT/ID[0] GPIO[1]/ID[1] GPIO[2]/SMBALERT#/ID[2] GPIO[3]/ID[3] GPIO[4]/ID[4] GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VCC XIN/32KHZ XOUT GPIO[15]/S_SMBCLK3 GPIO[14]/S_SMBDATA3 GPIO[13]/SMB_SEL[1] GPIO[12]/SMB_SEL[0] GPIO[11] GPIO[10] GPIO[9] GPIO[8] GPIO[7]/ID[7] GPIO[6]/ID[6] GPIO[5]/ID[5]
OZ998-SF-2.5
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OZ998
PIN DESCRIPTION
Name P_SMBCLK P_SMBDATA PWRGD Pin Type Input Drive Definition No. Primary SMBus Clock Input 1 I 3.3V/5V Ext-PU Primary SMBus Clock Input for SMBus protocol communication. Primary SMBus Data I/O 2 I/O 3.3V/5V Ext-PU 12mA Primary SMBus Data Input/Output for SMBus protocol communication. Host System Power Good 3 I TTL This pin indicates that the host system's power, including the Core Logic chipsets, is stable. Before the host system's power is stable, this input pin will tri-state the output pins, GPO[19:8], from OZ998 while GPO[7:0] will maintain its original value. Upon PWRGD going Low, the Secondary SMBus will be disconnected from the Primary SMBus. Reset 4 I TTL This active low pin will reset the OZ998. General Purpose I/O/ 5 I/O TTL 4mA Secondary SMBus-1 Clock I/O Fully programmable GPIO that can be used for a variety of dedicated or specific functions. Pin GPIO[16] is defaulted as an input. It is programmable to function as GPI[16] input, GPO[16] output or secondary SMBus-1 Clock Input/Output. Refer to GPIO[19:16] Config.1&2 Registers for more details and GPIO Config. Tables (section 8) for input/output selections. General Purpose I/O/ 6 I/O TTL 4mA Secondary SMBus-1 Data I/O Fully programmable GPIO that can be used for a variety of dedicated or specific functions. Pin GPIO[17] is defaulted as an input. It is programmable to function as GPI[17] input, GPO[17] output or secondary SMBus-1 Data Input/Output. Refer to GPIO[19:16] Config.1&2 Registers for more details and GPIO Config. Tables (section 8) for input/output selections. General Purpose I/O/ 7 I/O TTL 4mA Secondary SMBus-2 Clock I/O Fully programmable GPIO that can be used for a variety of dedicated or specific functions. Pin GPIO[18] is defaulted as an input. It is programmable to function as GPI[18] input, GPO[18] output or secondary SMBus-2 Clock Input/Output. Refer to GPIO[19:16] Config.1&2 Registers for more details and GPIO Config. Tables (section 8) for input/output selections. Note: OZ998A GPIO [19:18] need 47k pull-up for normal operation, OZ998B doesn't. General Purpose I/O / 8 I/O TTL 4mA Secondary SMBus-2 Data I/O Fully programmable GPIO that can be used for a variety of dedicated or specific functions. Pin GPIO[19] is defaulted as an input. It is programmable to function as GPI[19] input, GPO[19] output or secondary SMBus-2 Data Input/Output. Refer to GPIO[19:16] Config.1&2 Registers for more details and GPIO Config. Tables (section 8) for input/output selections. Note: OZ998A GPIO [19:18] need 47k pull-up for normal operation, OZ998B doesn't. General Purpose I/O / 9 I/O TTL 12mA SMIEVENT Fully programmable GPIO that can be used for a variety of dedicated or specific functions. Pin GPIO[0] has an SMIEVENT output as an alternate function. GPIO[0] is set as default. It is also programmable to function as GPI[0] input, GPO[0] output, ALF[0] output, or ID[0] input. In addition, if this pin is configured as output, TTL output, Open Drain or Open collector output can be selected. Refer to GPIO Config.1&2 Registers for more details and GPIO Config. Tables (section 8) for input/output selections. General Purpose I/O 10 I/O TTL 12mA Fully programmable GPIO that can be used for a variety of dedicated or specific functions. GPIO[1] pin defaults as input. It is also programmable to function as GPI[1] input, GPO[1] output, ALF[1] output, or ID[1] input. In addition, if this pin is configured as output, TTL output, Open Drain or Open collector output can be selected. Refer to GPIO Config.1&2 Registers for more details and GPIO Config. Tables (section 8) for input/output selections. General Purpose I/O/ 11 I/O TTL 12mA SMBALERT# Fully programmable GPIO that can be used for a variety of dedicated or specific functions. Pin GPIO[2] defaults as input. This pin, when programmed as an alternate function, can generate the SMBALERT# interrupt. SMBALERT# is an interrupt service request signal to the SMBus Host which can be generated by all devices connected to the OZ998. Pin GPIO[2]/SMBALERT# is also programmable to function as GPI[2] input, GPO[2] output, ALF[2] output, or ID[2] input. In addition, if this pin is configured as output, TTL output, Open Drain or Open collector can be selected. Refer to GPIO Config.1&2 Registers for more details and GPIO Config. Tables (section 8) for I/O selections.
RESET# GPIO[16]/ S_SMBCLK1
GPIO[17]/ S_SMBDATA1
GPIO[18]/ S_SMBCLK2
GPIO[19]/ S_SMBDATA2
GPIO[0]/ SMIEVENT/ID[0]
GPIO[1]/ID[1]
GPIO[2]/ SMBALERT#/ID[2]
OZ998-SF-2.5
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