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ADT7490ARQZ-R7 Datasheet(PDF) 1 Page - ON Semiconductor |
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ADT7490ARQZ-R7 Datasheet(HTML) 1 Page - ON Semiconductor |
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1 / 75 page  © Semiconductor Components Industries, LLC, 2009 December, 2009 − Rev. 4 1 Publication Order Number: ADT7490/D ADT7490 dBCoolR Remote Thermal Monitor and Fan Controller with PECI Interface The ADT7490 is a dBCool thermal monitor and multiple PWM fan controller for noise−sensitive or power−sensitive applications requiring active system cooling. The ADT7490 includes a local temperature sensor, two remote temperature sensors including series resistance cancellation, and monitors CPU temperature with a PECI interface. The ADT7490 can drive a fan using either a low or high frequency drive signal, 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 using the PECI, remote, or local temperature information. The effectiveness of the system’s thermal solution can be monitored using the THERM input. The ADT7490 also provides critical thermal protection to the system using the bidirectional THERM/SMBALERT pin as an output to prevent system or component overheating. Features • Temperature Measurement ♦ 1 Local On−Chip Temperature Sensor ♦ 2 Remote Temperature Sensors ♦ 3 Current External Temperature Sensors with Series Resistance Cancellation (SRC) ♦ PECI Interface for CPU Thermal Information and Support of Up to 4 PECI Inputs on 1 Pin • Fan Drive and Fan Speed Control ♦ 3 High Frequency or Low Frequency PWM Outputs for Use with 3−Wire or 4−Wire Fans ♦ 4 TACH Inputs to Measure Fan Speed ♦ OS Independent Automatic Fan Speed Control Based on Thermal Information ♦ Dynamic TMIN Control Mode to Optimize System Acoustics ♦ Default Startup at 100% PWM for All Fans for Robust Operation • Bidirectional THERM/SMBALERT Pin to Flag Out−of−Limit and Overtemperature Conditions • GPIO Functionality to Support Extra Features ♦ Can be Used for Loadline Setting for Voltage Regulation, LED Control, or Other Functions • IMON Monitoring for CPU Current and Power Information • Footprint and Register Compatible with ADT7473/ADT7475/ ADT7476/ADT7476A Family of Fan Controllers • SMBus Interface with Addressing Capability for Up to 3 Devices Applications • Personal Computers • Servers http://onsemi.com PIN ASSIGNMENT QSOP−24 NB CASE 492B # = Pb−Free Package See detailed ordering and shipping information in the package dimensions section on page 74 of this data sheet. ORDERING INFORMATION MARKING DIAGRAMS ADT7490 ARQZ #DateCode TOP MARKING Assembly Lot BOTTOM MARKING 1 D1– D2+ D2– TACH4/THERM/SMBALERT/ ADDR SELECT +5VIN +12VIN +2.5VIN/THERM VCCP IMON D1+ 16 9 15 10 14 11 13 12 TACH1 TACH2 PWM3/ADDREN 20 5 19 6 18 7 17 8 GND VCC GPIO1 TACH3 VTT PECI GPIO2 21 4 22 3 23 2 SCL PWM1/XTO 24 1 SDA PWM2/SMBALERT ADT7490 TOP VIEW |
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