ADM1034 datasheet(2/40 Pages) AD

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ADM1034

Rev. 0 | Page 2 of 40

TABLE OF CONTENTS

Specifications..................................................................................... 4

Absolute Maximum Ratings............................................................ 6

Thermal Characteristics .............................................................. 6

ESD Caution.................................................................................. 6

Pin Configuration and Function Descriptions............................. 7

Typical Performance Characteristics ............................................. 8

Functional Description .................................................................. 10

Internal Registers........................................................................ 10

Serial Bus Interface..................................................................... 10

Location Input............................................................................. 10

SMBus 2.0 ARP-Capable Mode ................................................ 10

SMBus 2.0 Fixed-and-Discoverable Mode.............................. 12

SMBus 2.0 Read and Write Operations ................................... 12

Write Operations ........................................................................ 14

Read Operations ......................................................................... 15

SMBus Timeout .......................................................................... 15

Packet Error Checking (PEC) ................................................... 15

Alert Response Address (ARA) ................................................ 15

Temperature Measurement System.............................................. 16

Internal Temperature Measurement ........................................ 16

Remote Temperature Measurement......................................... 16

Additional Functions ................................................................. 18

Layout Considerations ................................................................... 19

Limits, Status Registers, and Interrupts ....................................... 20

8-Bit Limits.................................................................................. 20

Out-of-Limit Comparisons ....................................................... 20

Analog Monitoring Cycle Time................................................ 20

Status Registers ........................................................................... 20

ALERT Interrupt Behavior ....................................................... 21

Handling SMBUSALERT Interrupts ....................................... 22

Interrupt Masking Register ....................................................... 22

FAN_FAULT Output ................................................................. 23

Fault Queue ................................................................................. 23

Conversion Rate Register .......................................................... 23

THERM I/O Timer and Limits ................................................ 23

THERM % Limit Register ......................................................... 24

Fan Drive Signal ......................................................................... 25

Synchronous Speed Control ..................................................... 25

Fan Inputs.................................................................................... 26

Fan Speed Measurement ........................................................... 26

Fan Speed Measurement Registers........................................... 27

Reading Fan Speed ..................................................................... 27

Calculating Fan Speed ............................................................... 27

Alarm Speed................................................................................ 27

Look-Up Table: Modes of Operation....................................... 28

Setting Up the Size of the Look-Up Table............................... 29

Setting Up the Look-Up Table in Linear Mode...................... 29

Setting Which Temperature Channel Controls a Fan ........... 29

Look-Up Table Hysteresis ......................................................... 29

Programming the THERM Limit for Each Temperature

Channel........................................................................................ 30

XOR Tree Test Mode.................................................................. 30

Lock Bit........................................................................................ 30

SW Reset...................................................................................... 30

Outline Dimensions ....................................................................... 40

Ordering Guide .......................................................................... 40

REVISION HISTORY

8/04—Revision 0: Initial Version

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