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PDF ADT7463 Data sheet ( Hoja de datos )
| Número de pieza | ADT7463 | |
| Descripción | dB COOL Remote Thermal Controller and Voltage Monitor | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
dBCOOL™ Remote Thermal
Controller and Voltage Monitor
ADT7463*
www.datasFhEeAetT4uU.cRoEmS
Monitors up to 5 Supply Voltages
Controls and Monitors up to 4 Fan Speeds
1 On-Chip and 2 Remote Temperature Sensors
Monitors up to 6 Processor VID Bits
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)
GENERAL DESCRIPTION
The ADT7463 dBCOOL controller is a complete systems
monitor and multiple PWM fan controller for noise-sensitive
applications requiring active system cooling. It can monitor
12 V, 5 V, and 2.5 V CPU supply voltages, 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 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 ADT7463 also provides critical thermal
protection to the system using the bidirectional THERM pin
as an output to prevent system or component overheating.
APPLICATIONS
Low Acoustic Noise PCs
Networking and Telecommunications Equipment
FUNCTIONAL BLOCK DIAGRAM
VID5
VID4
VID3
VID2
VID1
VID0
PWM1
PWM2
PWM3
TACH1
TACH2
TACH3
TACH4
ADDR
SELECT ADDR EN SCL SDA SMBALERT
PWM
REGISTERS
AND
CONTROLLERS
VID
REGISTER
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
THERM
VCC
D1+
D1–
D2+
D2–
VCC
+5VIN
+12VIN
+2.5VIN
VCCP
VCC TO ADT7463
BAND GAP
TEMP. SENSOR
THERMAL
PROTECTION
ADT7463
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.
REV. B
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. Trademarks and
registered trademarks are the property of their respective companies.
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 © 2003 Analog Devices, Inc. All rights reserved.
1 page  
ADT7463
PIN FUNCTION DESCRIPTIONS
Pin No. Mnemonic Description
1 SDA
2 SCL
3 GND
www.datasheet4u.com
4 VCC
5 VID0
6 VID1
7 VID2
8 VID3
9 TACH3
10 PWM2
SMBALERT
11 TACH1
12 TACH2
13 PWM3
ADDRESS
14 TACH4
ADDRESS
SELECT
THERM
15 D2–
16 D2+
17 D1–
18 D1+
19 VID4
20 +5VIN
THERM
21 +12VIN
VID5
22 +2.5VIN
SMBALERT
23 VCCP
24 PWM1/
XTO
Digital I/O (Open Drain). SMBus bidirectional serial data. Requires SMBus.
Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pull-up.
Ground Pin for the ADT7463.
Power Supply. Can be powered by 3.3 V standby if monitoring in low power states is required. VCC is
also monitored through this pin. The ADT7463 can also be powered from a 5 V supply. Setting Bit 7 of
Configuration Register 1 (Reg. 0x40) rescales the VCC input attenuators to correctly measure a 5 V supply.
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 3. Can be reconfigured as an analog
input (AIN3) to measure the speed of 2-wire fans.
Digital Output (Open Drain). Requires 10 kW typical pull-up. Pulsewidth modulated output to control FAN 2 speed.
Digital Output (Open Drain). This pin may be reconfigured as an SMBALERT interrupt output to signal
out-of-limit conditions.
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 1. Can be reconfigured as an analog
input (AIN1) to measure the speed of 2-wire fans.
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 2. Can be reconfigured as an analog
input (AIN2) to measure the speed of 2-wire fans.
Digital I/O (Open Drain). Pulsewidth modulated output to control Fan 3/Fan 4 speed. Requires 10 kW typical
pull-up.
If pulled low on power-up, this places the ADT7463 into address select mode, and the state of Pin 14 will ENABLE
determine the ADT7463’s slave address.
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 4. Can be reconfigured as an analog
input (AIN4) to measure the speed of 2-wire fans.
If in address select mode, this pin determines the SMBus device address.
Alternatively, the pin may be reconfigured as a bidirectional THERM pin. Can be used to time and monitor
assertions on the THERM input. For example, can be connected to the PROCHOT output of Intel’s Pentium 4
processor or to the output of a trip point temperature sensor. Can be used as an output to signal overtemperature
conditions.
Cathode Connection to Second Thermal Diode.
Anode Connection to Second Thermal Diode.
Cathode Connection to First Thermal Diode.
Anode Connection to First Thermal Diode.
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).
Analog Input. Monitors 5 V power supply.
Alternatively, this pin may be reconfigured as a bidirectional THERM pin. Can be used to time and monitor
assertions on the THERM input. For example, can be connected to the PROCHOT output of Intel’s Pentium 4
processor or to the output of a trip point temperature sensor. Can be used as an output to signal overtemperature
conditions.
Analog Input. Monitors 12 V power supply.
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).
Supports VRM10 solutions.
Analog Input. Monitors 2.5 V supply, typically a chipset voltage.
Digital Output (Open Drain). This pin may be reconfigured as an SMBALERT interrupt output to signal out-
of-limit conditions.
Analog Input. Monitors processor core voltage (0 V–3 V).
Digital Output (Open Drain). Pulsewidth modulated output to control Fan 1 speed. Requires 10 kW typical pull-up.
Also functions as the output from the XOR tree in XOR Test Mode.
REV. B
–5–
5 Page 
SCL
1
91
ADT7463
9
SDA
0 1 0 1 1 A1 A0 R/W
D7 D6 D5 D4 D3 D2 D1 D0
START BY
MASTER
www.datasheet4u.com
FRAME 1
SERIAL BUS ADDRESS
BYTE
ACK. BY
ADT7463
FRAME 2
ADDRESS POINTER REGISTER BYTE
ACK. BY STOP BY
ADT7463 MASTER
Figure 8. Writing to the Address Pointer Register Only
SCL
1
91
9
SDA
START BY
MASTER
0
1
01
1 A1 A0 R/W
D7 D6 D5 D4 D3 D2 D1
FRAME 1
SERIAL BUS ADDRESS
BYTE
ACK. BY
ADT7463
FRAME 2
DATA BYTE FROM ADT7463
Figure 9. Reading Data from a Previously Selected Register
D0
NO ACK. BY STOP BY
MASTER MASTER
When reading data from a register, there are two possibilities:
1. If the ADT7463’s address pointer register value is unknown
or not the desired value, it is first necessary to set it to the
correct value before data can be read from the desired data
register. This is done by performing a write to the ADT7463
as before, but only the data byte containing the register
address is sent as data is not to be written to the register.
This is shown in Figure 8.
A read operation is then performed consisting of the serial
bus address, R/W bit set to 1, followed by the data byte read
from the data register. This is shown in Figure 9.
2. If the address pointer register is known to be already at the
desired address, data can be read from the corresponding
data register without first writing to the address pointer
register, so Figure 8 can be omitted.
Notes
1. It is possible to read a data byte from a data register without
first writing to the address pointer register if the address
pointer register is already at the correct value. However, it is
not possible to write data to a register without writing to the
address pointer register because the first data byte of a write
is always written to the address pointer register.
2. In Figures 7 to 9, the serial bus address is shown as the
default value 01011(A1)(A0), where A1 and A0 are set by
the address select mode function previously defined.
3. In addition to supporting the Send Byte and Receive Byte
protocols, the ADT7463 also supports the Read Byte protocol
(see System Management Bus specifications Rev. 2.0 for
more information).
4. If it is required to perform several read or write operations in
succession, the master can send a repeat start condition
instead of a stop condition to begin a new operation.
REV. B
–11–
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ADT7463.PDF ] | |
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