ADT7473_11 ONSEMI [ON Semiconductor], ADT7473_11 Datasheet
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ADT7473_11
Manufacturer Part Number
ADT7473_11
Description
dbCOOL Remote Thermal Monitor and Fan Control
Manufacturer
ONSEMI [ON Semiconductor]
Datasheet
1.ADT7473_11.pdf
(74 pages)
ADT7473
dbCOOLt Remote Thermal
Monitor and Fan Control
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.
given temperature. A unique dynamic T
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
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© Semiconductor Components Industries, LLC, 2011
October, 2011 − Rev. 7
The ADT7473/ADT7473−1 dbCOOL controller is a thermal
The automatic fan speed control loop optimizes fan speed for a
Acoustics
on Measured Temperature
Changing Fan Speeds
(Fully SMBus 1.1 Compliant)
Compliant
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
Automatic Fan Speed Control Mode Controls System Cooling Based
Enhanced Acoustic Mode Dramatically Reduces User Perception of
Thermal Protection Feature via THERM Output
Monitors Performance Impact of Intel Pentium
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
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
MIN
Control Mode Intelligently Optimizes System
MIN
control mode enables the
R
4 Processor
1
See detailed ordering and shipping information in the package
dimensions section on page 73 of this data sheet.
THERM_LATCH/
PWM3/ADDREN
ADDR SELECT
SMBALERT
ADT7473
TACH3/
#YYWW
ADT747
ORDERING INFORMATION
TACH1
TACH2
3ARQZ
TACH3
PWM2/
TACH1
TACH2
PWM3
PWM2
#
YYWW = Date Code
xx
xxxx
GND
GND
SCL
SCL
V
MARKING DIAGRAMS
V
CC
CC
PIN ASSIGNMENTS
http://onsemi.com
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
= Pb−Free Package
= Assembly Lot
ADT7473−1
ADT7473
TOP VIEW
TOP VIEW
Publication Order Number:
CASE 492
QSOP−16
ADT7473−1
16
15
14
13
12
11
10
16
15
14
13
12
11
10
9
9
7473−1
ARQZ
ADT
xxxx
SDA
PWM1/XTO
V
D1+
D1–
D2+
D2–
TACH4/GPIO/THERM
SMBALERT
SDA
PWM1/XTO
V
D1+
D1–
D2+
D2–
TACH4/GPIO/THERM
SMBALERT
CCP
CCP
ADT7473/D