ADT7473_15 Datasheet, PDF (1/73 Pages) ON Semiconductor – Remote Thermal Monitor and Fan Control

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.
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 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 T_MIN 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^® Pentium^® 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)
• These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS
Compliant
www.onsemi.com
QSOP−16
CASE 492
PIN ASSIGNMENTS
SCL 1
GND 2
V_CC 3
TACH3 4
PWM2/
SMBALERT
5
TACH1 6
TACH2 7
PWM3 8
ADT7473
(Top View)
16 SDA
15 PWM1/XTO
14 V_CCP
13 D1+
12 D1−
11 D2+
10 D2−
9 TACH4/GPIO/
THERM/
SMBALERT
SCL 1
GND 2
V_CC 3
TACH3/
ADDR SELECT ⁴
PWM2/ ₅
THERM_LATCH
TACH1 ⁶
TACH2 7
PWM3/ 8
ADDREN
16 SDA
15 PWM1/XTO
14 V_CCP
ADT7473−1 ^{13 D1+}
(Top View) 12 D1−
11 D2+
10 D2−
9 TACH4/GPIO/
THERM/
SMBALERT
MARKING DIAGRAMS
ADT747
3ARQZ
#YYWW
ADT
7473−1
ARQZ
#YYWW
© Semiconductor Components Industries, LLC, 2015
April, 2015 − Rev. 10
ADT7473
ADT7473−1
ADT7473ARQZ = Specific Device Code
ADT7473−1ARQZ = Specific Device Code
#
= Pb-Free Package
YYWW
= Date Code
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 72 of this data sheet.
1
Publication Order Number:
ADT7473/D