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ADT7475ARQZ-REEL7 Datasheet(PDF) 1 Page - Analog Devices |
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ADT7475ARQZ-REEL7 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 68 page  dBCool® Remote Thermal Monitor and Fan Controller ADT7475 Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. 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 ©2006 Analog Devices, Inc. All rights reserved. FEATURES Controls and monitors up to 4 fans High and low frequency fan drive signal 1 on-chip and 2 remote temperature sensors Extended temperature measurement range, up to 191°C 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 3-wire and 4-wire fan speed measurement Limit comparison of all monitored values Meets SMBus 2.0 electrical specifications (fully SMBus 1.1 compliant) Fully RoHS compliant GENERAL DESCRIPTION The ADT7475 dBCool controller is a thermal monitor and multiple PWM fan controller for noise-sensitive or power- sensitive applications requiring active system cooling. The ADT7475 can drive a fan using either a low or high frequency drive signal, monitor the temperature of up to two remote sensor diodes plus its own internal temperature, and measure and control the speed of up to four fans, so they operate at the lowest possible speed for minimum acoustic noise. The automatic fan speed control loop optimizes fan speed for a given temperature. The effectiveness of the system’s thermal solution can be monitored using the THERM input. The ADT7475 also provides critical thermal protection to the system using the bidirectional THERM pin as an output to prevent system or component overheating. FUNCTIONAL BLOCK DIAGRAM BAND GAP REFERENCE 10-BIT ADC VALUE AND LIMIT REGISTERS LIMIT COMPARATORS INTERRUPT STATUS REGISTERS GND PWM1 PWM2 PWM3 PWM REGISTERS AND CONTROLLERS (HF AND LF) ACOUSTIC ENHANCEMENT CONTROL AUTOMATIC FAN SPEED CONTROL TACH1 TACH2 TACH3 TACH4 FAN SPEED COUNTER THERMAL PROTECTION PERFORMANCE MONITORING THERM INPUT SIGNAL CONDITIONING AND ANALOG MULTIPLEXER VCC TO ADT7475 VCC D1+ D1– D2+ D2– VCCP BAND GAP TEMPERATURE SENSOR INTERRUPT MASKING PWM CONFIGURATION REGISTERS ADDRESS POINTER REGISTER SERIAL BUS INTERFACE SCL SDA SMBALERT ADT7475 Figure 1. |
Similar Part No. - ADT7475ARQZ-REEL7 |
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Similar Description - ADT7475ARQZ-REEL7 |
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