ADT7467_12 Datasheet, PDF (1/72 Pages) ON Semiconductor – Remote Thermal Monitor and Fan Controller

ADT7467
dbCOOL Remote Thermal
Monitor and Fan Controller
The ADT7467 dbCOOL controller is a thermal monitor and
multiple PWM fan controller for noise-sensitive or power-sensitive
applications requiring active system cooling. The ADT7467 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. 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 ADT7467 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
 Series Resistance Cancellation on the Remote Channel
 Extended Temperature Measurement Range, up to 191C
 Dynamic T_MIN Control Mode Intelligently Optimizes System
Acoustics
 Automatic Fan Speed Control Mode Manages 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, 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 Device is Pb-Free and is RoHS Compliant*
 Halide-Free Packages are Available
http://onsemi.com
QSOP−16
CASE 492
PIN ASSIGNMENT
SCL 1
GND 2
V_CC 3
TACH3 4
PWM2/
SMBALERT
5
TACH1 6
TACH2 7
PWM3 8
ADT7467
(Top View)
16 SDA
15 PWM1/XTO
14 V_CCP
13 D1+
12 D1−
11 D2+
10 D2−
9 TACH4/GPIO/
THERM/
SMBALERT
MARKING DIAGRAM
T7467A
RQZ
#YYWW
T7467ARQZ
#
YY
WW
= Specific Device Code
= Pb-Free Package
= Date Code
= Work Week
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 70 of this data sheet.
* For additional information on our Pb-Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
 Semiconductor Components Industries, LLC, 2012
1
May, 2012 − Rev. 4
Publication Order Number:
ADT7467/D