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ADT7460ARQ-REEL7

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ADT7460ARQ-REEL7

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Part Number ADT7460ARQ-REEL7
Manufacturer ON Semiconductor
Description IC SENSOR TEMP FAN-CTRL 16QSOP
Datasheet ADT7460ARQ-REEL7 Datasheet
Package 16-SSOP (0.154", 3.90mm Width)
In Stock 8,546 piece(s)
Unit Price Request a Quote
Lead Time Can Ship Immediately
Estimated Delivery Time Jun 8 - Jun 13 (Choose Expedited Shipping)
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Part Number # ADT7460ARQ-REEL7 (PMIC - Thermal Management) is manufactured by ON Semiconductor and distributed by Heisener. Being one of the leading electronics distributors, we carry many kinds of electronic components from some of the world’s top class manufacturers. Their quality is guaranteed by its stringent quality control to meet all required standards.

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ADT7460ARQ-REEL7 Specifications

ManufacturerON Semiconductor
CategoryIntegrated Circuits (ICs) - PMIC - Thermal Management
Datasheet ADT7460ARQ-REEL7Datasheet
Package16-SSOP (0.154", 3.90mm Width)
SeriesdBCool?
FunctionFan Control, Temp Monitor
Sensor TypeInternal and External
Sensing Temperature-40°C ~ 120°C, External Sensor
Accuracy±3°C(Max)
TopologyADC, Comparator, Multiplexer, Register Bank
Output TypeSMBus
Output AlarmNo
Output FanYes
Voltage - Supply3 V ~ 5.5 V
Operating Temperature-40°C ~ 120°C
Mounting TypeSurface Mount
Package / Case16-SSOP (0.154", 3.90mm Width)
Supplier Device Package16-QSOP

ADT7460ARQ-REEL7 Datasheet

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dBCOOL™ Remote Thermal Controller and Fan Controller ADT7460 Rev. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved. FEATURES Controls and monitors up to 4 fan speeds 1 on-chip and 2 remote temperature sensors Dynamic TMIN control mode optimizes system acoustics intelligently Automatic fan speed control mode controls system cooling based on measured temperature Enhanced acoustic mode dramatically reduces user perception of changing fan speeds Thermal protection feature via THERM output Monitors performance impact of Intel® Pentium® 4 Processor thermal control circuit via THERM input 2-wire and 3-wire fan speed measurement Limit comparison of all monitored values Meets SMBus 2.0 electrical specifications (fully SMBus 1.1-compliant) APPLICATIONS Low acoustic noise PCs Networking and telecommunications equipment GENERAL DESCRIPTION The ADT74601 dBCOOL controller is a thermal monitor and multiple PWM fan controller for noise-sensitive applications requiring active system cooling. It can monitor the temperature of up to two remote sensor diodes plus its own internal temp- erature. It can measure and control the speed of up to four fans so that they operate at the lowest possible speed for minimum acoustic noise. The automatic fan speed control loop optimizes fan speed for a given temperature. A unique dynamic TMIN control mode enables the system thermals/acoustics to be intelligently managed. The effectiveness of the system’s thermal solution can be monitored using the THERM input. The ADT7460 also provides critical thermal protection to the system by using the bidirectional THERM pin as an output to prevent system or component overheating. FUNCTIONAL BLOCK DIAGRAM 03 22 8- 00 1 INPUT SIGNAL CONDITIONING AND ANALOG MULTIPLEXER GND SERIAL BUS INTERFACE SCL SDA VALUE AND LIMIT REGISTERS LIMIT COMPARATORS INTERRUPT STATUS REGISTERS BAND GAP TEMP SENSOR VCC TO ADT7460 ADDRESS POINTER REGISTER PWM CONFIGURATION REGISTERS INTERRUPT MASKING VCC D1+ D1– D2+ D2– +2.5VIN THERMAL PROTECTION PERFORMANCE MONITORING PWM REGISTERS AND CONTROLLERS PWM1 PWM2 PWM3 ACOUSTIC ENHANCEMENT CONTROL BAND GAP REFERENCE 10-BIT ADC ADT7460 AUTOMATIC FAN SPEED CONTROL DYNAMIC TMIN CONTROL FAN SPEED COUNTER TACH1 TACH2 TACH3 TACH4 THERM SMBALERT SMBUS ADDRESS SELECTION ADDR SELECT ADDR_EN Figure 1. 1Protected by U.S. Patent Nos. 6,188,189; 6,169,442; 6,097,239; 5,982,221; and 5,867,012. Other patents pending.

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ADT7460 Rev. C | Page 2 of 52 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 Measurement Inputs .................................................................... 9 Sequential Measurement ............................................................. 9 Recommended Implementation................................................. 9 ADT7460 Address Selection ..................................................... 10 Internal Registers of the ADT7460 .......................................... 10 Theory of Operation ...................................................................... 11 Serial Bus Interface..................................................................... 11 Voltage Measurement Input...................................................... 15 Additional ADC Functions for Voltage Measurements ........ 17 Temperature Measurement System.......................................... 17 Additional ADC Functions for Temperature Measurement 19 Limits, Status Registers, and Interrupts................................... 20 Status Registers ........................................................................... 21 Handling SMBALERT Interrupts............................................. 22 THERM Timer ........................................................................... 24 Fan Drive Using PWM Control ............................................... 27 Operating from 3.3 V Standby ................................................. 33 XNOR Tree Test Mode .............................................................. 33 Power-On Default ...................................................................... 33 ADT7460 Register Summary........................................................ 34 Outline Dimensions ....................................................................... 51 Ordering Guide .......................................................................... 51 REVISION HISTORY 3/05—Rev. B to Rev. C Updated Format.................................................................. Universal Changes to Absolute Maximum Ratings Table..............................5 Changes to ADT7460 Register Map Summary Section .............34 Updated Ordering Guide................................................................51 9/03—Rev. A to Rev. B Changed XOR Tree Test Mode to XNOR ............................ Universal Changes to SPECIFICATIONS.............................................................2 Changes to TPC 7....................................................................................7 6/03—Rev. 0 to Rev. A Updated ORDERING ............................................................................4 Updated the SERIAL BUS INTERFACE section................................9 Added the To Assign THERM Functionality to a Pin 9 section ....21 Added the THERM as an Input section.............................................21 Renamed the Therm Input section to THERM Timer ....................21 Renumbered the figures after Figure 25.............................................22 Updated Step 1 in the Configuring the Desired THERM Behavior section........................................................................................................2 Updated the Fan Speed Control section ............................................28 Added the POWER-ON DEFAULT section .....................................29 Updated Table IV ..................................................................................30 Updated Table XVIII ............................................................................38 Updated Table XX .................................................................................40 Updated Table XXXV ...........................................................................46 Updated OUTLINE DIMENSIONS ...................................................49

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ADT7460 Rev. C | Page 3 of 52 SPECIFICATIONS TA = TMIN to TMAX, VCC = VMIN to VMAX, unless otherwise noted. Table 1. Parameter1, , 2 3 Min Typ4 Max Unit Test Conditions/Comments POWER SUPPLY Supply Voltage 3.0 5.0 5.5 V Supply Current, ICC 3 mA Interface inactive, ADC active 20 µA Standby mode TEMPERATURE-TO-DIGITAL CONVERTER Local Sensor Accuracy ±1.5 °C 0°C ≤ TA ≤ 70°C ±3 °C −40°C ≤ TA ≤ +120°C Resolution 0.25 °C Remote Diode Sensor Accuracy ±1.5 °C 0°C ≤ TA ≤ 70°C; 0°C ≤ TD ≤ 120°C ±2.5 °C 0°C ≤ TA ≤ 105°C; 0°C ≤ TD ≤ 120°C ±3 °C 0°C ≤ TA ≤ 120°C; 0°C ≤ TD ≤ 120°C Resolution 0.25 °C Remote Sensor Source Current 180 µA High level 11 µA Low level ANALOG-TO-DIGITAL CONVERTER (INCLUDING MUX AND ATTENUATORS) Total Unadjusted Error, TUE ±1.5 % Differential Nonlinearity, DNL ±1 LSB 8 bits Power Supply Sensitivity ±0.1 %/V Conversion Time (Voltage Input) 11.38 13 ms Averaging enabled Conversion Time (Local Temperature) 12.09 13.50 ms Averaging enabled Conversion Time (Remote Temperature) 25.59 28 ms Averaging enabled Total Monitoring Cycle Time 120.17 134.50 ms Averaging enabled (incl. delay5) 13.51 15 ms Averaging disabled Input Resistance 80 140 200 kΩ FAN RPM-TO-DIGITAL CONVERTER Accuracy ±7 % 0°C ≤ TA ≤ 70°C ±11 % 0°C ≤ TA ≤ 105°C ±13 % −40°C ≤ TA ≤ +120°C Full-Scale Count 65,535 Nominal Input RPM 109 RPM Fan count = 0xBFFF 329 RPM Fan count = 0x3FFF 5000 RPM Fan count = 0x0438 10000 RPM Fan count = 0x021C Internal Clock Frequency 82.8 90.0 97.2 kHz OPEN-DRAIN DIGITAL OUTPUTS, PWM1–PWM3, XTO Current Sink, IOL 8.0 mA Output Low Voltage, VOL 0.4 V IOUT = −8.0 mA, VCC = 3.3 V High Level Output Current, IOH 0.1 1 µA VOUT = VCC OPEN-DRAIN SERIAL DATA BUS OUTPUT (SDA) Output Low Voltage, VOL 0.4 V IOUT = −4.0 mA, VCC = 3.3 V High Level Output Current, IOH 0.1 1 µA VOUT = VCC SMBUS DIGITAL INPUTS (SCL, SDA) Input High Voltage, VIH 2.0 V Input Low Voltage, VIL 0.4 V Hysteresis 500 mV

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ADT7460 Rev. C | Page 4 of 52 Parameter1, 2, 3 Min Typ4 Max Unit Test Conditions/Comments DIGITAL INPUT LOGIC LEVELS (TACH INPUTS) Input High Voltage, VIH 2.0 V 5.5 V Maximum input voltage Input Low Voltage, VIL +0.8 V −0.3 V Minimum input voltage Hysteresis 0.5 V p-p DIGITAL INPUT LOGIC LEVELS (THERM) Input High Voltage, VIH 1.7 V Input Low Voltage, VIL 0.8 V DIGITAL INPUT CURRENT Input High Current, IIH −1 µA VIN = VCC Input Low Current, IIL +1 µA VIN = 0 Input Capacitance, CIN 5 pF SERIAL BUS TIMING6 Clock Frequency, fSCLK 400 kHz See Figure 2 Glitch Immunity, tSW 50 ns Bus Free Time, tBUF 1.3 µs See Figure 2 Start Setup Time, tSU;STA 0.6 µs See Figure 2 Start Hold Time, tHD;STA 0.6 µs See Figure 2 SCL Low Time, tLOW 1.3 µs See Figure 2 SCL High Time, tHIGH 0.6 µs See Figure 2 SCL, SDA Rise Time, tR 300 ns See Figure 2 SCL, SDA Fall Time, tF 300 µs See Figure 2 Data Setup Time, tSU;DAT 100 ns See Figure 2 Detect Clock Low Timeout, tTIMEOUT 15 35 ms Can be optionally disabled 3 Timing specifications are tested at logic levels of VIL = 0.8 V for a falling edge and at VIH = 2.0 V for a rising edge. 4 Typicals are at TA = 25°C and represent the most likely parametric norm. 5 The delay is the time between the round robin finishing one set of measurements and starting the next. 6 Guaranteed by design, not production tested. 1 All voltages are measured with respect to GND, unless otherwise specified. 2 Logic inputs accept input high voltages up to VMAX even when the device is operating down to VMIN. SCL SDA P S S PtBUF tHD; STA tHD; DAT tSU; DAT tFtR tLOW tSU; STAtHIGH tHD; STA tSU; STO 03 22 8- 00 2 Figure 2. Serial Bus Timing Diagram

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ADT7460 Rev. C | Page 5 of 52 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Rating Positive Supply Voltage (VCC) 6.5 V Voltage on Any Other Input or Output Pin −0.3 V to +6.5 V Input Current at Any Pin ±5 mA Package Input Current ±20 mA Maximum Junction Temperature (TJ max) 150°C Storage Temperature Range −65°C to +150°C Lead Temperature, Soldering IR Reflow Peak Temperature 220°C IR Reflow Peak Temperature for Pb Free 260°C Lead Temperature (Soldering 10 s) 300°C ESD Rating 1500 V Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. THERMAL CHARACTERISTICS 16-Lead QSOP Package: θJA = 150°C/W θJC = 39°C/W ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

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ADT7460 Rev. C | Page 6 of 52 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS 03 22 8- 00 3 ADT7460 TOP VIEW (Not to Scale) 1 2 15 PWM1/XTO 3 4 5 16 14 13 12 SCL GND VCC TACH3 2/SMBALERT SDA +2.5VIN/SMBALERT 6 11 10 TACH1 7TACH2 8 9PWM3/ADDRESS ENABLE PWM D1+ D1– D2+ D2– TACH4/ADDRESS SELECT/THERM Figure 3. Pin Configuration Table 3. P tion Descript Pin No. Mnemonic in Func ions Description 1 SCL Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pull-up. 2 GND 460. Ground Pin for the ADT7 3 VCC Power Supply. Can be powered by 3.3 V standby if monitoring in low power states is required. VCC is also monitored through this pin. The ADT7460 can also be powered from a 5 V supply. Setting Bit 7 of Configuration Register 1 (Reg. 0x40) rescales the VCC input attenuators to correctly measure a 5 V supply. 4 TACH3 re speed of Fan 3. Can be reconfigured as an Digital Input (Open Drain). Fan tachometer input to measu analog input (AIN3) to measure the speed of 2-wire fans. 5 PWM2 utput (Open Drain). Requires 10 kΩ typical pull-up. Pulse-width modulated output to control SMBALERT Digital O Fan 2 speed. Digital Output (Open Drain). This pin may be reconfigured as an SMBALERT interrupt output to signal out-of-limit conditions. 6 TACH1 re speed of Fan 1. Can be reconfigured as an Digital Input (Open Drain). Fan tachometer input to measu analog input (AIN1) to measure the speed of 2-wire fans. 7 TACH2 Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 2. Can be reconfigured as an analog input (AIN2) to measure the speed of 2-wire fans. 8 PWM3 ypical Digital I/O (Open Drain). Pulse-width modulated output to control Fan 3/4 speed. Requires 10 kΩ t pull-up. ADDRESS ENABLE If pulled low on power-up, this places the ADT7460 into address select mode, and the state of Pin 9 determines the ADT7460’s slave address. 9 TACH4 put to measure speed of Fan 4. Can be reconfigured as an Digital Input (Open Drain). Fan tachometer in analog input (AIN4) to measure the speed of 2-wire fans. ADDRESS SELECT If in address select mode, this pin determines the SMBus device address. THERM Alternatively, the pin may be reconfigured as a bidirectional THERM pin. Can be used to time and monit assertions on the or THERM input. For example, can be connected to the PROCHOT output of Intel’s Pentium 4 processor or to the output of a trip point temperature sensor. Can be used as an output to signal overtemperature conditions. 10 D2− Cathode Connection to Second Thermal Diode. 11 D2+ Anode Connection to Second Thermal Diode. 12 D1− Cathode Connection to First Thermal Diode. 13 D1+ Anode Connection to First Thermal Diode. 14 +2.5VIN Analog Input. Monitors 2.5 V supply, typically a chipset voltage. SMBALERT Digital Output (Open Drain). This pin may be reconfigured as an SMBALERT interrupt output to signal out-of-limit conditions. 15 PWM1/XTO Digital Output (Open Drain). Pulse-width modulated output to control Fan 1 speed. Requires 10 kΩ typical pull-up. 16 SDA Digital I/O (Open Drain). SMBus bidirectional serial data. Requires SMBus pull-up.

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ADT7460 Rev. C | Page 7 of 52 TYPICAL PERFORMANCE CHARACTERISTICS LEAKAGE RESISTANCE (MΩ) R E M O T E T E M P E R A T U R E E R R O R ( °C ) 15 10 –20 1 3.3 100.010.0 30.0 0 –5 –10 –15 5 DXPTO GND DXP TO VCC (3.3V) 03 22 8- 00 4 Figure 4. Remote Temperature Error vs. Leakage Resistance DXP–DXN CAPACITANCE (nF) R E M O T E T E M P E R A T U R E E R R O R ( °C ) 3 1 0 –3 –6 –9 –12 –15 –18 –21 –24 –27 2.2 3.3 4.7 10.0 22.0 47.0 –30 –33 –36 REMOTE TEMPERATURE ERROR (°C)  03 22 8- 00 5 Figure 5. Remote Temperature Error vs. Capacitance between D+ and D− TEMPERATURE (°C) R E M O T E T E M P E R A T U R E E R R O R (° C ) 3 –40 2 1 0 –1 –2 –3 10 60 110 –3 SIGMA +3 SIGMA LOW LIMIT HIGH LIMIT 03 22 8- 00 6 TEMPERATURE (°C) L O C A L T E M P E R A T U R E E R R O R ( °C ) –3 –40 10 11060 1 0 –2 –1 3 2 LOW LIMIT HIGH LIMIT –3 SIGMA +3 SIGMA 03 22 8- 00 7 Figure 7. Local Temperature Error vs. Actual Temperature FREQUENCY (Hz) R E M O T E T E M P E R A T U R E E R R O R ( °C ) 14 12 –2 100k 550k 50M5M 6 4 0 2 10 8 100mV 250mV 03 22 8- 00 8 Figure 8. Remote Temperature Error vs. Power Supply Noise Frequency R R O R ( °C ) 12.5 10.0 –5.0 100k 550k 50M FREQUENCY (Hz) L O C A L T E M P E R A T U R E 5M 5.0 2.5 –2.5 0 7.5 100mV E 250mV 03 22 8- 00 9 Figure 9. Local Temperature Error vs. Power Supply Noise Frequency Figure 6. Remote Temperature Error vs. Actual Temperature

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ADT7460 Rev. C | Page 8 of 52 1.90 1.85 1.80 1.75 1.70 1.65 1.60 1.55 1.50 1.45 1.40 2.5 2.6 3.0 3.4 3.8 4.2 4.6 5.0 5.4 5.5 SUPPLY VOLTAGE (V) S U P P L Y C U R R E N T ( m A ) 03 22 8- 01 0 Figure 10. Supply Current vs. Supply Voltage FREQUENCY (Hz) R E M O T E T E M P E R A T U R E E R R O R ( °C ) 16 60k 14 12 10 8 6 4 2 0 –2 110k 1M 10M 50M 10mV 20mV 03 22 8- 01 1 Figure 11. Remote Temperature Error vs. Differential Mode Noise Frequency 10k FREQUENCY (Hz) R E M O T E T E M P E R A T U R E E R R O R ( °C ) 40 35 30 25 20 15 10 5 0 –5 –10 100k 1M 10M 20mV 40mV 100mV 03 22 8- 01 2 Figure 12. Remote Temperature Error vs. Common-Mode Noise Frequency

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ADT7460 Rev. C | Page 9 of 52 PRODUCT DESCRIPTION The ADT7460 is a thermal monitor and multiple fan controller for any system requiring monitoring and cooling. The device communicates with the system via a serial System Management Bus (SMBus). The serial bus controller has an optional address line for device selection (Pin 9), a serial data line for reading and writing addresses and data (Pin 16), and an input line for the serial clock (Pin 1). All control and programming functions of the ADT7460 are performed over the serial bus. In addition, two of the pins can be reconfigured as an SMBALERT output to indicate out-of-limit conditions. MEASUREMENT INPUTS The device has three measurement inputs, one for voltage and two for temperature. It can also measure its own supply voltage and can measure ambient temperature with its on-chip temperature sensor. Pin 14 is an analog input with an on-chip attenuator and is configured to monitor 2.5 V. Power is supplied to the chip via Pin 3, and the system also monitors VCC through this pin. In PCs, this pin is normally connected to a 3.3 V standby supply. This pin can, however, be connected to a 5 V supply and monitor it without overranging. Remote temperature sensing is provided by the D1± and D2± inputs, to which diode-connected, external temperature-sensing transistors, such as a 2N3904 or CPU thermal diode, may be connected. The ADC also accepts input from an on-chip band gap temperature sensor, which monitors system ambient temperature. SEQUENTIAL MEASUREMENT When the ADT7460 monitoring sequence is started, it cycles sequentially through the measurement of 2.5 V input and the temperature sensors. Measured values from these inputs are stored in value registers. These can be read out over the serial bus or can be compared with programmed limits stored in the limit registers. The results of out-of-limit comparisons are stored in the status registers, which can be read over the serial bus to flag out-of-limit conditions. RECOMMENDED IMPLEMENTATION Configuring the ADT7460 as in Figure 13 allows the systems designer the following features: • Two PWM outputs for fan control of up to three fans (the front and rear chassis fans are connected in parallel). • Three TACH fan speed measurement inputs. • VCC measured internally through Pin 3. • CPU temperature measured using Remote 1 temperature channel. • Ambient temperature measured through Remote 2 temperature channel. • Bidirectional THERM pin. Allows Intel Pentium 4 PROCHOT monitoring and can function as an overtemperature THERM output. • SMBALERT system interrupt output. ICH TACH2 D1+ D1– D2+ D2– TACH1 P AMBIENT TEMPERATURE PWM3 TACH3 GND ADT7460 SCL SMBALERT SDA WM1 THERM PROCHOT FRONT CHASSIS 32 28 -0 13 FAN REAR CHASSIS FAN Figure 13. Recommended Implementation

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May 26, 2020

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