OZ998

OZ998-SF-2.2

Page 3

PIN DESCRIPTION

Name

Pin

No.

Type

Input

Drive

Definition

P_SMBCLK

1

I

3.3V/5V Ext-PU

-

Primary SMBus Clock Input

Primary SMBus Clock Input for SMBus protocol communication.

P_SMBDATA

2

I/O

3.3V/5V Ext-PU

12mA

Primary SMBus Data I/O

Primary SMBus Data Input/Output for SMBus protocol communication.

PWRGD

3

I

TTL

-

Host System Power Good

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

-

Reset

This active low pin will reset the OZ998.

GPIO[16]/

S_SMBCLK1

5

I/O

TTL

4mA

General Purpose I/O/

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.

GPIO[17]/

S_SMBDATA1

6

I/O

TTL

4mA

General Purpose I/O/

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.

GPIO[18]/

S_SMBCLK2

7

I/O

TTL

4mA

General Purpose I/O/

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.

GPIO[19]/

S_SMBDATA2

8

I/O

TTL

4mA

General Purpose I/O /

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.

GPIO[0]/

SMIEVENT/ID[0]

9

I/O

TTL

12mA

General Purpose I/O /

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.

GPIO[1]/ID[1]

10

I/O

TTL

12mA

General Purpose I/O

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.

GPIO[2]/

SMBALERT#/ID[2]

11

I/O

TTL

12mA

General Purpose I/O/

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.