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ADT7475ARQZ-REEL Arkusz danych(PDF) 1 Page - ON Semiconductor |
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ADT7475ARQZ-REEL Arkusz danych(HTML) 1 Page - ON Semiconductor |
1 / 58 page © Semiconductor Components Industries, LLC, 2009 June, 2009 − Rev. 4 1 Publication Order Number: ADT7475/D ADT7475 dBCOOLR Remote Thermal Monitor and Fan Controller 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 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. 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. 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 PentiumR 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) • This is a Pb−Free Device • Fully RoHS Compliant http://onsemi.com See detailed ordering and shipping information in the package dimensions section on page 57 of this data sheet. ORDERING INFORMATION MARKING DIAGRAM PIN ASSIGNMENT # = Pb−Free Package YYWW = Date Code 12 11 10 9 D1– D2+ D2– 16 15 14 13 SDA PWM1/XTO VCCP D1+ 5 6 7 8 TACH1 TACH2 PWM3 1 2 3 4 SCL GND VCC TACH3 ADT7475 TOP VIEW PWM2/ SMBALERT TACH4/GPIO/THERM SMBALERT ADT7475 ARQZ #YYWW QSOP−16 CASE 492 |
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