ADT7473
Remote Thermal Monitor
and Fan Control
The ADT7473/ADT7473−1 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.
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The automatic fan speed control loop optimizes fan speed for a
QSOP−16
CASE 492
given temperature. A unique dynamic T
control mode enables the
MIN
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.
PIN ASSIGNMENTS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SCL
SDA
GND
PWM1/XTO
V
V
CCP
CC
Features
TACH3
D1+
D1−
D2+
D2−
ADT7473
PWM2/
SMBALERT
TACH1
• Controls and Monitors Up to 4 Fans
(Top View)
• 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
TACH2
PWM3
TACH4/GPIO/
THERM/
SMBALERT
• Dynamic T
Control Mode Intelligently Optimizes System
MIN
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
SCL
SDA
Acoustics
GND
PWM1/XTO
• Automatic Fan Speed Control Mode Controls System Cooling Based
on Measured Temperature
V
V
CCP
CC
TACH3/
ADDR SELECT
PWM2/
D1+
D1−
D2+
D2−
ADT7473−1
• Enhanced Acoustic Mode Dramatically Reduces User Perception of
Changing Fan Speeds
(Top View)
THERM_LATCH
TACH1
• Thermal Protection Feature via THERM Output
TACH2
®
®
• Monitors Performance Impact of Intel Pentium 4 Processor
• Thermal Control Circuit via THERM Input
PWM3/
TACH4/GPIO/
THERM/
SMBALERT
9
ADDREN
• 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)
• These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS
Compliant
TOP MARKING
BOTTOM MARKING
ADT
7473−1
ARQZ
#YYWW
ZZZZ
ZZZZ
ADT7473−1ARQZ = Specific Device Code
#
= Pb-Free Package
= Date Code
= Assembly Lot Code
YYWW
ZZZZ
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 72 of this data sheet.
© Semiconductor Components Industries, LLC, 2016
1
Publication Order Number:
November, 2016 − Rev. 11
ADT7473/D