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ADM1028ARQ View Datasheet(PDF) - Analog Devices

Part NameDescriptionManufacturer
ADM1028ARQ Remote Thermal Diode Monitor with Linear Fan Control ADI
Analog Devices ADI
ADM1028ARQ Datasheet PDF : 16 Pages
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a
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
Remote Thermal Diode
Monitor with Linear Fan Control
ADM1028
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.
FUNCTIONAL BLOCK DIAGRAM
VCC3AUX
R_OFF
VCC3AUX
10k
R_RST
ADM1028
AUXRST
RST
RESET
FAN_SPD SHUTOFF
AND R_OFF RESET
D+
D–
THERMA/NTEST_OUT
VCC3AUX
10k
ANALOG
SIGNAL
CONDITIONING
POWER-ON
RESET
REMOTE
FUNCTION
REGISTER
ADDRESS
POINTER
REGISTER
ALERT
STATUS
REGISTER
ADC
2.5V
BANDGAP
REFERENCE
THERMB
SERIAL BUS
INTERFACE
ANALOG O/P
REGISTER,
COUNTER
AND 8-BIT DAC
VALUE AND
LIMIT
REGISTERS
LIMIT
COMPARATORS
INTERRUPT
STATUS
REGISTERS
INT MASK
REGISTER
MASK
GATING
CONFIGURATION
REGISTER
SDA
SCL
FAN_SPD/NTEST_IN
INT
FAN_OFF
REV. A
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.
GPI
GND
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
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