LM93 datasheet(8/92 Pages) NSC

8 / 92 page

9.0 Pin Descriptions

Symbol

Pin #

Type

Function

GPIO_0/TACH1

Digital I/O

(Open-Drain)

Can be configured as fan tach input or a general purpose

open-drain digital I/O.

GPIO_1/TACH2

Digital I/O

(Open-Drain)

Can be configured as fan tach input or a general purpose

open-drain digital I/O.

GPIO_2/TACH3

Digital I/O

(Open-Drain)

Can be configured as fan tach input or a general purpose

open-drain digital I/O.

GPIO_3/TACH4

Digital I/O

(Open-Drain)

Can be configured as fan tach input or a general purpose

open-drain digital I/O..

GPIO_4 /

P1_THERMTRIP

Digital I/O

(Open-Drain)

A general purpose open-drain digital I/O. Can be configured to

monitor a CPU’s THERMTRIP signal to mask other errors.

GPIO_5 /

P2_THERMTRIP

Digital I/O

(Open-Drain)

A general purpose open-drain digital I/O. Can be configured to

monitor a CPU’s THERMTRIP signal to mask other errors.

GPIO_6

Digital I/O

(Open-Drain)

Can be used to detect the state of CPU1 IERR or a general purpose

open-drain digital I/O

GPIO_7

Digital I/O

(Open-Drain)

Can be used to detect the state of CPU2 IERR or a general purpose

open-drain digital I/O

VRD1_HOT

Digital Input

CPU1 voltage regulator HOT

VRD2_HOT

Digital Input

CPU2 voltage regulator HOT

SCSI_TERM1

Digital Input

SCSI Channel 1 termination fuse. Could also be used as a general

purpose input to trigger an error event.

SCSI_TERM2

Digital Input

SCSI Channel 2 termination fuse. Could also be used as a general

purpose input to trigger an error event.

SMBDAT

Digital I/O

(Open-Drain)

Bidirectional System Management Bus Data. Output configured as

5V tolerant open-drain. SMBus 2.0 compliant.

SMBCLK

Digital Input

System Management Bus Clock. Driven by an open-drain output,

and is 5V tolerant. SMBus 2.0 Compliant.

ALERT/XtestOut

Digital Output

(Open-Drain)

Open-drain ALERT output used in an interrupt driven system to

signal that an error event has occurred. Masked error events do not

activate the ALERT output. When in XOR tree test mode, functions

as XOR Tree output.

RESET

Digital I/O

(Open-Drain)

Open-drain reset output when power is first applied to the LM93.

Used as a reset for devices powered by 3.3V stand-by. After reset,

this pin becomes a reset input. See section 6.2 for more information.

AGND

GROUND Input

Analog Ground

REF

Analog Output

2.5V used for external ADC reference, or as a V

REF reference

voltage

REMOTE1−

Remote Thermal

Diode_1- Input (CPU

1 THERMDC)

This is the negative input (current sink) from the CPU1 thermal

diode. Connected to THERMDC pin of Pentium processor or the

emitter of a diode connected MMBT3904 NPN transistor. Serves as

the negative input into the A/D for thermal diode voltage

measurements. A 100 pF capacitor is optional and can be

connected between REMOTE1− and REMOTE1+.

REMOTE1+

Remote Thermal

Diode_1+ I/O (CPU1

THERMDA)

This is a positive connection to the CPU1 thermal diode. Serves as

the positive input into the A/D for thermal diode voltage

measurements. It also serves as a current source output that

forward biases the thermal diode. Connected to THERMDA pin of

Pentium processor or the base of a diode connected MMBT3904

NPN transistor. A 100 pF capacitor is optional and can be

connected between REMOTE1− and REMOTE1+.

LM93 Datasheet(PDF) 8 Page - National Semiconductor (TI)

LM93 Datasheet(HTML) 8 Page - National Semiconductor (TI)

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