dBCOOL™ Remote Thermal
Controls and Monitors up to 4 Fan Speeds
1 On-Chip and 2 Remote Temperature Sensors
Dynamic TMIN Control Mode Optimizes System Acoustics
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)
Low Acoustic Noise PCs
Networking and Telecommunications Equipment
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.
FUNCTIONAL BLOCK DIAGRAM
SELECT ADDR EN SCL SDA SMBALERT
VCC TO ADT7460
*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.
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.
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© Analog Devices, Inc., 2002