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ADM1033ARQ Datasheet(PDF) 2 Page - Analog Devices |
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ADM1033ARQ Datasheet(HTML) 2 Page - Analog Devices |
2 / 40 page ADM1033 Rev. 0 | Page 2 of 40 TABLE OF CONTENTS General Description ......................................................................... 3 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 Register Addresses for Single/Block Byte Modes ................... 14 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 Look-Up Table ............................................................................ 28 Setting Up the Look-Up Table in Linear Mode...................... 29 Selecting which Temperature Channel Controls a Fan......... 29 Look-Up Table Hysteresis ......................................................... 29 Programming the THERM Limit for Temperature Channels ....................................................................................................... 30 XOR Tree Test Mode.................................................................. 30 Lock Bit........................................................................................ 30 SW Reset...................................................................................... 30 Outline Dimensions ....................................................................... 39 Ordering Guide .......................................................................... 39 REVISION HISTORY 8/04—Revision 0: Initial Version |
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