ADT7470ARQZ-REEL Analog Devices Inc, ADT7470ARQZ-REEL Datasheet - Page 2

• Manufacturer Part Number: ADT7470ARQZ-REEL
• Description: IC,Motor Controller,SSOP,16PIN
• Manufacturer: Analog Devices Inc

Specifications of ADT7470ARQZ-REEL

• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Fan Speed Control, Register Bank
• Sensor Type: External
• Sensing Temperature: External Sensor
• Output Type: I²C™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-ADT7470EBZ - BOARD EVALUATION FOR ADT7470
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADT7470
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 5
Pin Configuration and Function Descriptions ............................. 6
Functional Description .................................................................... 7
General-Purpose I/O Pins (Open Drain) ...................................... 8
SMBus/I
Temperature Measurement Using TMP05/TMP06 ................... 13
REVISION HISTORY
7/09—Rev. B to Rev. C
Changes to Functional Description Section ................................. 7
Added Temperature Data Format Section .................................. 14
Additions to Fan Drive Using PWM Control Section ............... 20
Additions to Manual Fan Speed Control Section ....................... 25
Additions to Automatic Fan Speed Control Section .................. 26
Serial Bus Timing Specifications ................................................ 4
Thermal Characteristics .............................................................. 5
ESD Caution .................................................................................. 5
General Description ..................................................................... 7
Configuration Register 1 (Address 0x40) .................................. 7
Configuration Register 2 (Address 0x74) .................................. 7
ID Registers ................................................................................... 7
Address Selection ......................................................................... 9
Serial Bus Protocol ....................................................................... 9
Write Operations ........................................................................ 11
Read Operations ......................................................................... 12
SMBus Timeout .......................................................................... 12
Measuring Temperature ............................................................ 13
Temperature ReadBack By the Host ........................................ 14
2
C Serial Interface .............................................................. 9
Rev. C | Page 2 of 40
Limit and Status Registers ............................................................. 16
Fan Drive Using PWM Control .................................................... 20
Fan Speed Measurement ................................................................ 22
Manual Fan Speed Control ........................................................... 25
Automatic Fan Speed Control ...................................................... 26
Register Map ................................................................................... 27
Detailed Register Descriptions ..................................................... 29
Outline Dimensions ....................................................................... 39
7/05—Rev. A to Rev. B
References to PWM_IN changed to TMP_IN ............... Universal
Changes to T
Added Address Selection Section .................................................... 7
Added Thermal Zones Section ..................................................... 12
Added Temperature Reading Section .......................................... 13
Added Note to Table 39 ................................................................. 32
2/05—Rev. 0 to Rev. A
Added General-Purpose I/O Pins (Open Drain) Section ......... 11
11/04—Revision 0: Initial Version
Temperature Data Format ......................................................... 14
Temperature Measurement Limits ........................................... 15
Thermal Zones for Automatic Fan Control ............................ 15
Limit Values ................................................................................ 16
Temperature Limits .................................................................... 16
Fan Speed Limits ........................................................................ 16
Out-of-Limit Comparisons ....................................................... 16
Status Registers ........................................................................... 17
SMBALERT Interrupt ................................................................ 18
High Frequency Fan Drive ........................................................ 20
Low Frequency Fan Drive ......................................................... 20
Setting the Fan Drive Frequency .............................................. 21
Inverted PWM Output .............................................................. 21
Fan Full Speed Function ............................................................ 21
Tach Inputs .................................................................................. 22
Fan Speed Measurement ........................................................... 23
Setting the PWM Duty Cycle ................................................... 25
Ordering Guide .......................................................................... 39
MIN
Registers Section .................................................. 7