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Analog Devices Semiconductor Electronic Components Datasheet

ADT7460 Datasheet

dB COOL Remote Thermal Controller and Fan Controller

No Preview Available !

ADT7460 pdf
a
dBCOOLRemote Thermal
ControllerandFanController
ADT7460*
www.datasFhEeAetT4uU.cRoEmS
Controls and Monitors up to 4 Fan Speeds
1 On-Chip and 2 Remote Temperature Sensors
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 and 3-Wire Fan Speed Measurement
Limit Comparison of All Monitored Values
Meets SMBus 2.0 Electrical Specifications
(Fully SMBus 1.1 Compliant)
APPLICATIONS
Low Acoustic Noise PCs
Networking and Telecommunications Equipment
GENERAL DESCRIPTION
The ADT7460 dBCOOL controller is a thermal monitor and
multiple PWM fan controller for noise-sensitive applications
requiring active system cooling. It can monitor the temperature
of up to two remote sensor diodes, plus its own internal tem-
perature. It can measure and control the speed of up to four
fans so that they operate at the lowest possible speed for mini-
mum 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 ADT7460 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
ADDR
SELECT ADDR EN SCL SDA SMBALERT
PWM1
PWM2
PWM3
TACH1
TACH2
TACH3
TACH4
THERM
VCC
D1+
D1–
D2+
D2–
+2.5VIN
PWM
REGISTERS
AND
CONTROLLERS
VCC TO ADT7460
BAND GAP
TEMP. SENSOR
ACOUSTIC
ENHANCEMENT
CONTROL
FAN SPEED
COUNTER
PERFORMANCE
MONITORING
SMBUS
ADDRESS
SELECTION
SERIAL BUS
INTERFACE
AUTOMATIC
FAN SPEED
CONTROL
ADDRESS
POINTER
REGISTER
DYNAMIC
TMIN
CONTROL
PWM
CONFIGURATION
REGISTERS
INTERRUPT
MASKING
THERMAL
PROTECTION
ADT7460
INPUT
SIGNAL
CONDITIONING
AND
ANALOG
MULTIPLEXER
10-BIT
ADC
BAND GAP
REFERENCE
GND
INTERRUPT
STATUS
REGISTERS
LIMIT
COMPARATORS
VALUE AND
LIMIT
REGISTERS
*Protected by U.S. Patent Nos. 6,188,189; 6,169,442; 6,097,239; 5,982,221; and 5,867,012. Other patents pending.
dBCOOL is a trademark of Analog Devices, Inc.
Intel and Pentium are registered trademarks of Intel Corp.
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. No license is granted by implication or otherwise under any
patent or patent rights of Analog Devices.
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
© Analog Devices, Inc., 2002


Analog Devices Semiconductor Electronic Components Datasheet

ADT7460 Datasheet

dB COOL Remote Thermal Controller and Fan Controller

No Preview Available !

ADT7460 pdf
ADT7460–SPECIFICATIONS1,2,3,4
(TA = TMIN to TMAX, VCC = VMIN to VMAX, unless otherwise noted.)
Parameter
POWER SUPPLY
Supply Voltage
Supply Current, ICC
Min
3.0
wwTwE.dMatPaEshReAetT4uU.cRoEm-TO-DIGITAL CONVERTER
Local Sensor Accuracy
Resolution
Remote Diode Sensor Accuracy
Resolution
Remote Sensor Source Current
ANALOG-TO-DIGITAL CONVERTER
(INCLUDING MUX AND ATTENUATORS)
Total Unadjusted Error, TUE
Differential Nonlinearity, DNL
Power Supply Sensitivity
Conversion Time (Voltage Input)
Conversion Time (Local Temperature)
Conversion Time (Remote Temperature)
Total Monitoring Cycle Time
Total Monitoring Cycle Time
Input Resistance
FAN RPM-TO-DIGITAL CONVERTER
Accuracy
80
Full-Scale Count
Nominal Input RPM
Internal Clock Frequency
OPEN-DRAIN DIGITAL OUTPUTS,
PWM1–PWM3, XTO
Current Sink, IOL
Output Low Voltage, VOL
High Level Output Current, IOH
OPEN-DRAIN SERIAL DATA
BUS OUTPUT (SDA)
Output Low Voltage, VOL
High Level Output Current, IOH
SMBUS DIGITAL INPUTS
(SCL, SDA)
Input High Voltage, VIH
Input Low Voltage, VIL
Hysteresis
DIGITAL INPUT LOGIC LEVELS
(TACH INPUTS)
Input High Voltage, VIH
Input Low Voltage, VIL
Hysteresis
82.8
2.0
2.0
–0.3
Typ Max Unit Test Conditions/Comments
5.0 5.5 V
3 mA Interface Inactive, ADC Active
20 µA Standby Mode
± 1.5 ЊC
± 3 ЊC
0.25 ЊC
± 1.5 ЊC
± 2.5 ЊC
± 3 ЊC
0.25 ЊC
180 µA
11 µA
0ЊC Յ TA Յ 70ЊC
–40ЊC Յ TA Յ +120ЊC
0ЊC Յ TA Յ 70ЊC; 0ЊC Յ TD Յ 120ЊC
0ЊC Յ TA Յ 105ЊC; 0ЊC Յ TD Յ 120ЊC
0ЊC Յ TA Յ 120ЊC; 0ЊC Յ TD Յ 120ЊC
High Level
Low Level
± 0.1
11.38
12.09
25.59
120.17
13.51
140
± 1.5
±1
13
13.5
28
134.5
15
200
%
LSB
%/V
ms
ms
ms
ms
ms
k
8 Bits
Averaging Enabled
Averaging Enabled
Averaging Enabled
Averaging Enabled (incl. delay5)
Averaging Disabled
109
329
5000
10000
90
±7
± 11
± 13
65,535
97.2
%
%
%
RPM
RPM
RPM
RPM
kHz
0ЊC Յ TA Յ 70ЊC
0ЊC Յ TA Յ 105ЊC
–40ЊC Յ TA Յ +120ЊC
Fan Count = 0xBFFF
Fan Count = 0x3FFF
Fan Count = 0x0438
Fan Count = 0x021C
8.0 mA
0.4 V
IOUT = –8.0 mA, VCC = 3.3 V
0.1 1
µA VOUT = VCC
0.4 V
IOUT = –4.0 mA, VCC = 3.3 V
0.1 1
µA VOUT = VCC
0.4
500
V
V
mV
V
5.5 V
Maximum Input Voltage
+0.8 V
V Minimum Input Voltage
0.5 V p-p
–2– REV. 0


Part Number ADT7460
Description dB COOL Remote Thermal Controller and Fan Controller
Maker Analog Devices
Total Page 30 Pages
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