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| 型號： | ADM1028ARQZ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | MO-137AB, QSOP-16 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 379K |
| 代理商： | ADM1028ARQZ-REEL7 |
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ADM1028
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
Fax: 781/326-8703
2003 Analog Devices, Inc. All rights reserved.
REV. B
Remote Thermal Diode
Monitor with Linear Fan Control
FUNCTIONAL BLOCK DIAGRAM
2.5V
BANDGAP
REFERENCE
ANALOG
SIGNAL
CONDITIONING
ALERT
STATUS
REGISTER
ADC
ADM1028
R_OFF
R_RST
D+
D–
SDA
SCL
RST
10k
VCC3AUX
FAN_SPD/NTEST_IN
INT
FAN_OFF
SERIAL BUS
INTERFACE
LIMIT
COMPARATORS
INTERRUPT
STATUS
REGISTERS
MASK
GATING
CONFIGURATION
REGISTER
INT MASK
REGISTER
ANALOG O/P
REGISTER,
COUNTER
AND 8-BIT DAC
VALUE AND
LIMIT
REGISTERS
VCC3AUX
POWER-ON
RESET
FAN_SPD SHUTOFF
AND R_OFF RESET
10k
VCC3AUX
THERMA/NTEST_OUT
AUXRST
RESET
THERMB
GPI
GND
ADDRESS
POINTER
REGISTER
REMOTE
FUNCTION
REGISTER
FEATURES
On-Chip Temperature Sensor
External Temperature Measurement with Remote Diode
Interrupt and Over-Temperature Outputs
Fault-Tolerant Fan Control with Auto Hardware Trip Point
Remote Reset and Power-Down Functions
LDCM Support
System Management Bus (SMBus) Communications
Standby Mode to Minimize Power Consumption
Limit Comparison of all Monitored Values
DAC Output for Linear Fan Speed Control
Ramp Rate Register for Control of Rate of Change of
Fan Speed, Reduction of Fan Acoustics
APPLICATIONS
Network Servers and Personal Computers
Microprocessor-Based Office Equipment
Test Equipment and Measuring Instruments
GENERAL DESCRIPTION
The ADM1028 is a low-cost temperature monitor and fan
controller for microprocessor-based systems. The temperature
of a remote sensor diode may be measured, allowing monitoring
of processor temperature in single processor systems. An on-chip
temperature sensor monitors ambient system temperature.
Measured values can be read out via the System Management
Bus, and values for limit comparisons can be programmed in
over the same serial bus.
The ADM1028 also contains a DAC for fan speed control. An
automatic hardware temperature trip point is provided and the fan
will be driven to full speed if it is exceeded. A Ramp Rate Register
is provided to control the rate with which fan speed is increased or
decreased. This is to eliminate sudden changes in fan speed,
thereby reducing fan acoustics and prolonging the fan’s life.
Finally, the chip has remote reset and power-down functionality,
allowing it to be remotely shut down via the SMBus.
The ADM1028’s 3.0 V to 5.5 V supply voltage range, low
supply current, and SMBus make it ideal for a wide range of
applications. These include hardware monitoring applications
in PCs, electronic test equipment, and office electronics.
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