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ADT7473 Datasheet(PDF) 1 Page - ON Semiconductor

Part # ADT7473
Description  dBCOOL Remote Thermal Monitor and Fan Control
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

ADT7473 Datasheet(HTML) 1 Page - ON Semiconductor

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© Semiconductor Components Industries, LLC, 2009
April, 2009 − Rev. 6
1
Publication Order Number:
ADT7473/D
ADT7473
dBCOOLR Remote Thermal
Monitor and Fan Control
The ADT7473/ADT7473−1 dBCOOL controller is a thermal
monitor and multiple PWM fan controller for noise sensitive or power
sensitive applications requiring active system cooling. The
ADT7473/ADT7473−1 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 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 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 ADT7473/ADT7473−1 also provide 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 TMIN Control Mode Intelligently 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 PentiumR 4 Processor
Thermal Control Circuit via THERM Input
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 is a Pb−Free Device
Fully RoHS Compliant
MARKING DIAGRAMS
http://onsemi.com
PIN ASSIGNMENTS
#
= Pb−Free Package
YYWW = Date Code
xx
= Assembly Lot
See detailed ordering and shipping information in the package
dimensions section on page 73 of this data sheet.
ORDERING INFORMATION
12
11
10
9
D1–
D2+
D2–
16
15
14
13
SDA
PWM1/XTO
VCCP
D1+
5
6
7
8
TACH1
TACH2
PWM3
1
2
3
4
SCL
GND
VCC
TACH3
ADT7473
TOP VIEW
PWM2/
SMBALERT
TACH4/GPIO/THERM
SMBALERT
12
11
10
9
D1–
D2+
D2–
16
15
14
13
SDA
PWM1/XTO
VCCP
D1+
5
6
7
8
TACH1
TACH2
1
2
3
4
SCL
GND
VCC
TACH3/
ADDR SELECT
ADT7473−1
TOP VIEW
THERM_LATCH/
PWM2
PWM3/ADDREN
TACH4/GPIO/THERM
SMBALERT
ADT747
3ARQZ
#YYWW
xxxx
QSOP−16
CASE 492
ADT7473
ADT7473−1
ADT
7473−1
ARQZ
xxxx


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