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PDF ADT7468 Data sheet ( Hoja de datos )
| Número de pieza | ADT7468 | |
| Descripción | Remote Thermal Controller and Voltage Monitor | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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dBCool™ Remote Thermal
Controller and Voltage Monitor
ADT7468
www.daFtaEsAhTeeUt4RuE.cSom
GENERAL DESCRIPTION
Monitors up to 5 voltages
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 optimizes system acoustics
intelligently
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
2-wire, 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)
The ADT7468 dBCOOLTM controller is a thermal monitor and
multiple PWM fan controller for noise-sensitive or power-
sensitive applications requiring active system cooling. The
ADT7468 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 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. 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 ADT7468 also
provides critical thermal protection to the system using the
bidirectional THERM pin as an output to prevent system or
component overheating.
FUNCTIONAL BLOCK DIAGRAM
VID5
VID4
VID3
VID2
VID1
VID0
PWM1
PWM2
PWM3
TACH1
TACH2
TACH3
TACH4
PWM REGISTERS
AND
CONTROLLERS
HF & LF
ACOUSTIC
ENHANCEMENT
CONTROL
ACOUSTIC
ENHANCEMENT
CONTROL
FAN SPEED
COUNTER
PERFORMANCE
MONITORING
SCL SDA SMBALERT
SERIAL BUS
INTERFACE
AUTOMATIC
FAN SPEED
CONTROL
DYNAMIC
TMIN
CONTROL
ADDRESS
POINTER
REGISTER
PWM
CONFIGURATION
REGISTERS
INTERRUPT
MASKING
THERM
VCC
D1+
D1–
D2+
D2–
+5VIN
+12VIN
+2.5VIN
VCCP
VCC TO ADT7468
SRC
THERMAL
PROTECTION
INPUT
SIGNAL
CONDITIONING
AND
ANALOG
MULTIPLEXER
ADT7468
10-BIT
ADC
BAND GAP
REFERENCE
INTERRUPT
STATUS
REGISTERS
LIMIT
COMPARATORS
VALUE AND
LIMIT
REGISTERS
BAND GAP
TEMP SENSOR
GND
Figure 1.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
1 page  
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Rating
Positive Supply Voltage (VCC)
www.daMtaasxhimeeut4mu.Vcoolmtage on 12 VIN Pin
Voltage on Any Input or Output Pin
5.5 V
20 V
−0.3 V to +6.5 V
Input Current at Any Pin
±5 mA
Package Input Current
±20 mA
Maximum Junction Temperature (TJMAX)
Storage Temperature Range
Lead Temperature, Soldering
IR Reflow Peak Temperature
Lead Temperature (Soldering 10 s)
150°C
−65°C to +150°C
220°C
300°C
ESD Rating
1000 V
ADT7468
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
THERMAL CHARACTERISTICS
24-lead QSOP package:
θJA = 150°C/W
θJC = 39°C/W
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. 0 | Page 5 of 80
5 Page 
Bit 1= 0 is the high frequency (22.5 kHz) fan drive signal.
Bit 1 = 1 switches the fan drive to low frequency PWM,
programmable between 10 Hz and 100 Hz, the same as the
ADT7463. The default = 0 = HF PWM.
www.daBtaitsh2eseett4sut.hceomdirection for the GPIO: 0 = input, 1 = output.
Bit 3 sets the GPIO polarity: 0 = active low, 1 = active high.
HOW TO SET THE FUNCTIONALITY OF PIN 14
Pin 14 on the ADT7468 has four possible functions:
SMBALERT, THERM, GPIO, and TACH4. The user chooses the
required functionality by setting Bit 0 and Bit 1 of Configura-
tion Register 4 at Address 0x7D.
Table 4. Pin 14 Settings
Bit 0
Bit 1
Function
00 TACH4
01 THERM
10 SMBALERT
11 GPIO
ADT7468
RECOMMENDED IMPLEMENTATION
Configuring the ADT7468 as in Figure 15 allows the system
designer to use the following features:
• Two PWM outputs for fan control of up to three fans (the
front and rear chassis fans are connected in parallel).
• Three TACH fan speed measurement inputs.
• VCC measured internally through Pin 3.
• CPU temperature measured using Remote 1 temperature
channel.
• Ambient temperature measured through Remote 2
temperature channel.
• Bidirectional THERM pin. This feature allows Intel
Pentium 4 PROCHOT monitoring and can function as an
overtemperature THERM output. It can alternatively be
programmed as an SMBALERT system interrupt output.
FRONT
CHASSIS
FAN
ADT7468
TACH2
PWM1
TACH1
CPU FAN
REAR
CHASSIS
FAN
AMBIENT
TEMPERATURE
PWM3
TACH3 VID[0:4]/VID[0:5]
D2+
5(VRM9)/6(VRM10)
D2–
THERM
D1+ PROCHOT
D1–
CPU
ADP316x
VRM
CONTROLLER
VCOMP
3.3VSB
5V
12V/VID5
SDA
SCL
CURRENT SMBALERT
VCORE GND
ICH
Figure 15. ADT7468 Configuration
Rev. 0 | Page 11 of 80
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ADT7468.PDF ] | |
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