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ADT7470 Datasheet(PDF) 1 Page - Analog Devices |
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ADT7470 Datasheet(HTML) 1 Page - Analog Devices |
1 / 41 page Temperature Sensor Hub and Fan Controller Data Sheet ADT7470 Rev. E Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother 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 ©2004–2013 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES Monitors up to 10 remote temperature sensors Monitors and controls speed of up to 4 fans independently PWM outputs drive each fan under software control FULL_SPEED input allows fans to be blasted to maximum speed by external hardware SMBALERT interrupt signals failures to system controller Three-state ADDR pin allows up to 3 devices on a single bus Temperature decoder interprets TMP05 temperature sensors and communicates values over I2C bus Limit comparison of all monitored values Supports fast I2C standard (400 kHz max) Meets SMBus 2.0 electrical specifications (fully SMBus 1.1-compliant) APPLICATIONS Servers Networking and telecommunications equipment Desktops GENERAL DESCRIPTION The ADT74701 controller is a multichannel temperature sensor and PWM fan controller and fan speed monitor for systems requiring active cooling. It is designed to interface directly to an I2C® bus. The ADT7470 can monitor up to 10 daisy-chained TMP05 temperature sensors. It can also monitor and control the speed of four fans, in automatic or in manual control loops. A FULL_SPEED input is provided to allow the fans to be blasted to maximum speed, via external hardware control, under extreme thermal conditions or on system startup. An SMBALERT interrupt communicates error conditions such as fan under speed and over temperature measurements to the system service processor. Individual error conditions can then be read from status registers over the I2C bus. FUNCTIONAL BLOCK DIAGRAM FULL_SPEED PWM1 PWM2 PWM3 PWM4 TACH1 TACH2 TACH3 TACH4 TMP_START TMP_IN ADDR SDA SCL SMBALERT ADDRESS POINTER REGISTER PWM CONFIG REGISTERS INTERRUPT MASKING INTERRUPT STATUS REGISTERS LIMIT COMPARATORS VALUE AND LIMIT REGISTERS SERIAL BUS INTERFACE SMBus ADDRESS SELECTION AUTOMATIC FAN SPEED CONTROL PWM REGISTERS AND CONTROLLERS FAN SPEED COUNTERS TEMPERATURE DECODER ADT7470 Figure 1. 1 Protected by Patent Numbers US6,169,442, US6,097,239, US5,982,221, US5,867,012. Other patents pending. |
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