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ADT7467ARQ-REEL Datasheet(PDF) 2 Page - Analog Devices |
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ADT7467ARQ-REEL Datasheet(HTML) 2 Page - Analog Devices |
2 / 80 page ADT7467 Rev. 0 | Page 2 of 80 TABLE OF CONTENTS Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 Thermal Characteristics .............................................................. 5 ESD Caution.................................................................................. 5 Pin Configuration and Function Descriptions............................. 6 Typical Performance Characteristics ............................................. 7 Product Description ......................................................................... 9 Comparison between ADT7460 and ADT7467 ....................... 9 Recommended Implementation............................................... 10 Serial Bus Interface..................................................................... 11 Write Operations ........................................................................ 12 Read Operations ......................................................................... 13 SMBus Timeout .......................................................................... 13 Voltage Measurement Input...................................................... 13 Analog-to-Digital Converter .................................................... 13 Input Circuitry............................................................................ 14 Voltage Measurement Registers................................................ 14 VCCP Limit Registers ................................................................... 14 Additional ADC Functions for Voltage Measurements ........ 14 Temperature Measurement Method ........................................ 15 Series Resistance Cancellation.................................................. 17 Factors Affecting Diode Accuracy ........................................... 17 Additional ADC Functions for Temperature Measurement. 19 Limits, Status Registers, and Interrupts ....................................... 20 Limit Values................................................................................. 20 Status Registers ........................................................................... 21 THERM Timer............................................................................ 23 Laying Out 2-Wire and 3-Wire Fans ....................................... 28 Operating from 3.3 V Standby.................................................. 32 XNOR Tree Test Mode .............................................................. 33 Power-On Default ...................................................................... 33 Programming the Automatic Fan Speed Control Loop ............ 34 Automatic Fan Control Overview............................................ 34 Step 1: Hardware Configuration.............................................. 35 Recommended Implementation 1 ........................................... 36 Recommended Implementation 2 ........................................... 37 Step 2: Configuring the MUX................................................... 38 Step 3: TMIN Settings for Thermal Calibration Channels....... 40 Step 4: PWMMIN for Each PWM (Fan) Output....................... 41 Step 5: PWMMAX for PWM (Fan) Outputs.............................. 41 Step 6: TRANGE for Temperature Channels................................ 42 Step 7: TTHERM for Temperature Channels ............................... 45 Step 8: THYST for Temperature Channels .................................. 46 Dynamic TMIN Control Mode ................................................... 48 Step 9: Operating Points for Temperature Channels ............. 50 Step 10: High and Low Limits for Temperature Channels ... 51 Step 11: Monitoring THERM ................................................... 53 Enhancing System Acoustics .................................................... 54 Step 12: Ramp Rate for Acoustic Enhancement..................... 56 Register Tables ................................................................................ 59 ADT7467 Programming Block Diagram .................................... 77 Outline Dimensions ....................................................................... 78 Ordering Guide .......................................................................... 78 REVISION HISTORY Revision 0: Initial Version |
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