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
http://onsemi.com
MARKING
DIAGRAM
QSOP−16
CASE 492
T7460A
RQZ
#YYWW
•
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
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
14
V
CCP
ADT7460
TOP VIEW
13
D1+
12
D1–
11
D2+
10
D2–
9
TACH4/ADDR SELECT
/THERM
APPLICATIONS
•
Low Acoustic Noise PCs
•
Networking and Telecommunications Equipment
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
ONSEMI [ ON SEMICONDUCTOR ]
