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ADT7460 Datasheet(PDF) 1 Page - Analog Devices |
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ADT7460 Datasheet(HTML) 1 Page - Analog Devices |
1 / 48 page REV. 0 a 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. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2002 ADT7460* dBCOOL™ Remote Thermal ControllerandFanController 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 FUNCTIONAL BLOCK DIAGRAM BAND GAP REFERENCE 10-BIT ADC INPUT SIGNAL CONDITIONING AND ANALOG MULTIPLEXER GND SERIAL BUS INTERFACE SCL SDA ADDRESS POINTER REGISTER ADT7460 VALUE AND LIMIT REGISTERS LIMIT COMPARATORS PWM CONFIGURATION REGISTERS INTERRUPT STATUS REGISTERS BAND GAP TEMP. SENSOR VCC TO ADT7460 INTERRUPT MASKING SMBALERT VCC D1+ D1– D2+ D2– +2.5VIN SMBUS ADDRESS SELECTION ADDR EN ADDR SELECT THERMAL PROTECTION PERFORMANCE MONITORING THERM PWM REGISTERS AND CONTROLLERS PWM1 PWM2 PWM3 ACOUSTIC ENHANCEMENT CONTROL AUTOMATIC FAN SPEED CONTROL DYNAMIC TMIN CONTROL FAN SPEED COUNTER TACH1 TACH2 TACH3 TACH4 GENERAL DESCRIPTION The ADT7460 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 tem- perature. It can measure and control the speed of up to four fans so that they operate at the lowest possible speed for mini- mum 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 using the bidirectional THERM pin as an output to prevent system or component overheating. *Protected by U.S. Patent Nos. 6,188,189; 6,169,442; 6,097,239; 5,982,221; and 5,867,012. Other patents pending. dBCOOL is a trademark of Analog Devices, Inc. Intel and Pentium are registered trademarks of Intel Corp. |
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