LM93 datasheet(2/95 Pages) TI1

2 / 95 page

LM93

SNAS210E – DECEMBER 2003 – REVISED MARCH 2013

www.ti.com

The LM93 builds upon the functionality of previous motherboard management ASICs and uses some of

the LM85's features (i.e. smart tachometer mode). It also adds measurement and control support for

dynamic Vccp monitoring and PROCHOT. It is designed to monitor a dual processor Xeon class

motherboard with a minimum of external components.

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Introduction

.............................................. 1

3.7

DYNAMIC Vccp MONITORING USING VID

....... 15

1.1

Features

............................................. 1

3.8

VREF OUTPUT ...................................... 15

1.2

Applications

.......................................... 1

3.9

PROCHOT BACKGROUND INFORMATION

...... 16

1.3

Description

........................................... 1

3.10

PROCHOT MONITORING

......................... 16

Device Information

...................................... 3

3.11

PROCHOT OUTPUT CONTROL

.................. 17

2.1

Block Diagram

....................................... 3

3.12

FAN SPEED MEASUREMENT

.................... 18

2.2

Application

........................................... 3

3.13

SMART FAN SPEED MEASUREMENT

........... 18

2.3

Connection Diagram

................................. 4

3.14

Inputs/Outputs

...................................... 18

2.4

Recommended Implementation

..................... 8

3.15

SMBus Interface

.................................... 20

Functional Description

................................. 9

3.16

Using The LM93

.................................... 30

3.1

MONITORING CYCLE TIME

........................ 9

3.17

Registers

............................................ 42

3.2

ΣΔ A/D INHERENT AVERAGING

................... 9

Electrical Specifications

............................. 81

3.3

TEMPERATURE MONITORING

..................... 9

4.1

Absolute Maximum Ratings

........................ 81

3.4

VOLTAGE MONITORING

.......................... 10

4.2

Operating Ratings

.................................. 82

3.5

RECOMMENDED EXTERNAL SCALING

4.3

DC Electrical Characteristics

....................... 82

RESISTORS FOR +12V POWER RAILS

.......... 12

4.4

AC Electrical Characteristics

....................... 84

3.6

RECOMMENDED EXTERNAL SCALING CIRCUIT

Data Sheet Revision History

.............................. 87

FOR

−12V POWER INPUT

........................ 12

Device Information

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