ADT7460 Datasheet, PDF (1/46 Pages) Analog Devices – dB COOL Remote Thermal Controller and Fan Controller

ADT7460
dBCOOL^R Remote Thermal
Monitor and Fan Controller
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 temperature. It can
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. A
unique dynamic T_MIN 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 by using the bidirectional THERM pin as an output to prevent
system or component overheating.
Features
• Controls and Monitors Up to 4 Fans
• 1 On−Chip and 2 Remote Temperature Sensors
• Dynamic T_MIN Control Mode Optimizes System Acoustics
Intelligently
• 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^R 4 Processor
• 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)
• This is a Pb−Free Device
APPLICATIONS
• Low Acoustic Noise PCs
• Networking and Telecommunications Equipment
http://onsemi.com
MARKING
DIAGRAM
QSOP−16
CASE 492
T7460A
RQZ
#YYWW
xxx = Device Code
#
= Pb−Free Package
YYWW = Date Code
PIN ASSIGNMENT
SCL 1
GND 2
V_CC 3
TACH3 4
PWM2/ ₅
SMBALERT
TACH1 ⁶
TACH2 7
PWM3/ ⁸
ADDR ENABLE
16 SDA
15 PWM1/XTO
ADT7460
TOP VIEW
14 V_CCP
13 D1+
12 D1–
11 D2+
10 D2–
9 TACH4/ADDR SELECT
/THERM
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 45 of this data sheet.
© Semiconductor Components Industries, LLC, 2010
1
June, 2010 − Rev. 5
Publication Order Number:
ADT7460/D