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dBCool
®
Remote Thermal
Controller and Voltage Monitor
ADT7466
©2010 SCILLC. All rights reserved. Publication Order Number:
May 2010 – Rev. 3 ADT7466/D
FEATURES
Monitors two analog voltages or thermistor temperature
inputs
One on-chip and up to two remote temperature sensors with
series resistance cancellation
Controls and monitors the speed of up to two fans
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
PROCHOT
input
3-wire fan speed measurement
Limit comparison of all monitored values
SMBus 1.1 serial interface
APPLICATIONS
Low acoustic noise notebook PCs
GENERAL DESCRIPTION
The ADT7466 dBCool controller is a complete thermal monitor
and dual fan controller for noise-sensitive applications
requiring active system cooling. It can monitor two analog
voltages or the temperature of two thermistors, plus its own
supply voltage. It can monitor the temperature of up to two
remote sensor diodes, plus its own internal temperature. It can
measure and control the speed of up to two 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. The effectiveness of the system’s
thermal solution can be monitored using the
PROCHOT
input
to time and monitor the
PROCHOT
output of the processor.
FUNCTIONAL BLOCK DIAGRAM
SERIAL BUS
INTERFACE
CONFIGURATION
REGISTERS
THERM
REGISTER
INTERRUPT
MASKING
ADDRESS
POINTER
REGISTER
INTERRUPT
STATUS
REGISTERS
VALUE AND
LIMIT
REGISTERS
ACOUSTIC
ENHANCEMENT
CONTROL
AUTOMATIC
FAN SPEED
CONTROL
LIMIT
COMPARATORS
FAN
SPEED
MONITOR
V_FAN_MIN
V_FAN_ON
CONTROL
8-BIT
DAC
8-BIT
DAC
V
CC
GND REFOUT
SCL SDA ALERT
BAND GAP
REFERENCE
10-BIT
ADC
DRIVE1
DRIVE2
TACH1
TACH2
FANLOCK
FAN1_ON/
PROCHOT/
THERM
D1+
D1–
AIN1/TH1/D2–
AIN2/TH2/D2+
SERIES
RESISTANCE
CANCELLATION
BAND GAP
TEMPERATURE
SENSOR
SERIES
RESISTANCE
CANCELLATION
INPUT
SIGNAL
CONDITIONING
AND
ANALOG
MULTIPLEXER
FAN1
ENABLE
PROCHOT
ADT7466
04711-001
Figure 1.
Protected by U.S. Patent Numbers 6,188,189; 6,169,442; 6,097,239; 5,982,221; 5,867,012.
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