LM93 datasheet(4/92 Pages) NSC

4 / 92 page

Table of Contents

1.0 General Description ..................................................................................................................................... 1

2.0 Features ....................................................................................................................................................... 1

3.0 Key Specifications ........................................................................................................................................ 1

4.0 Applications .................................................................................................................................................. 1

5.0 Ordering Information .................................................................................................................................... 1

6.0 Block Diagram .............................................................................................................................................. 2

7.0 Application .................................................................................................................................................... 3

8.0 Connection Diagram .................................................................................................................................... 7

9.0 Pin Descriptions ........................................................................................................................................... 8

10.0 Server Terminology .................................................................................................................................. 10

11.0 Recommended Implementation ................................................................................................................ 11

12.0 Functional Description .............................................................................................................................. 12

12.1 MONITORING CYCLE TIME ................................................................................................................ 12

12.2

Σ∆ A/D INHERENT AVERAGING .......................................................................................................... 12

12.3 TEMPERATURE MONITORING ........................................................................................................... 12

12.3.1 Temperature Data Format ............................................................................................................... 12

12.3.2 Thermal Diode Fault Status ............................................................................................................. 12

12.4 VOLTAGE MONITORING ...................................................................................................................... 12

12.5 RECOMMENDED EXTERNAL SCALING RESISTORS FOR +12V POWER RAILS .......................... 13

12.6 RECOMMENDED EXTERNAL SCALING CIRCUIT FOR −12V POWER INPUT ................................ 13

12.7 DYNAMIC Vccp MONITORING USING VID ......................................................................................... 15

12.8 V

REF OUTPUT

....................................................................................................................................... 15

12.9 PROCHOT BACKGROUND INFORMATION ........................................................................................ 15

12.10 PROCHOT MONITORING .................................................................................................................. 16

12.11 PROCHOT OUTPUT CONTROL ........................................................................................................ 16

12.12 FAN SPEED MEASUREMENT ........................................................................................................... 17

12.13 SMART FAN SPEED MEASUREMENT ............................................................................................. 17

13.0 Inputs/Outputs .......................................................................................................................................... 17

13.1 ALERT OUTPUT ................................................................................................................................... 17

13.2 RESET INPUT/OUTPUT ....................................................................................................................... 17

13.3 PWM1 AND PWM2 OUTPUTS ............................................................................................................. 17

13.4 SCSI_TERMx INPUTS .......................................................................................................................... 17

13.5 VRD1_HOT AND VRD2_HOT INPUTS ................................................................................................ 18

13.6 GPIO PINS ............................................................................................................................................ 18

13.7 FAN TACH INPUTS ............................................................................................................................... 18

14.0 SMBus Interface ....................................................................................................................................... 18

14.1 SMBUS ADDRESSING ......................................................................................................................... 18

14.2 DIGITAL NOISE EFFECT ON SMBUS COMMUNICATION ................................................................. 18

14.3 GENERAL SMBUS TIMING .................................................................................................................. 18

14.4 SMBUS ERROR SAFETY FEATURES ................................................................................................ 19

14.5 SERIAL INTERFACE PROTOCOLS ..................................................................................................... 19

14.5.1 Address Incrementing ...................................................................................................................... 19

14.5.2 Block Command Code Summary .................................................................................................... 20

14.5.3 Write Operations

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

14.5.3.1 Write Byte ................................................................................................................................... 20

14.5.3.2 Write Word ................................................................................................................................. 20

14.5.3.3 SMBus Write Block to Any Address ........................................................................................... 21

14.5.3.4 I

2C™ Block Write ....................................................................................................................... 21

14.5.4 Read Operations .............................................................................................................................. 22

14.5.4.1 Read Byte .................................................................................................................................. 22

14.5.4.2 Read Word ................................................................................................................................. 22

14.5.4.3 SMBus Block-Write Block-Read Process Call ........................................................................... 22

14.5.4.4 Simulated SMBus Block-Write Block-Read Process Call .......................................................... 24

14.5.4.5 SMBus Fixed Address Block Reads .......................................................................................... 24

14.5.4.6 I

2C Block Reads ......................................................................................................................... 25

14.6 READING AND WRITING 16-BIT REGISTERS ................................................................................... 25

15.0 Using The LM93 ....................................................................................................................................... 26

15.1 POWER ON .......................................................................................................................................... 26

15.2 RESETS ................................................................................................................................................ 26

15.3 ADDRESS SELECTION ........................................................................................................................ 26

15.4 DEVICE SETUP .................................................................................................................................... 26

15.5 ROUND ROBIN VOLTAGE/TEMPERATURE CONVERSION CYCLE ................................................. 26

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