System Hardware Monitor with
Remote Diode Thermal Sensing
ADM1024
FEATURES
Up to 9 Measurement Channels
Inputs Programmable to Measure Analog Voltage, Fan
Speed, or External Temperature
External Temperature Measurement with Remote
Diode (2 Channels)
On-Chip Temperature Sensor
5 Digital Inputs for VID Bits
LDCM Support
System Management Bus (SMBus)
Chassis Intrusion Detect
Interrupt and Overtemperature Outputs
Programmable
RESET
Input Pin
Shutdown Mode to Minimize Power Consumption
Limit Comparison of All Monitored Values
APPLICATIONS
Network Servers and Personal Computers
Microprocessor-Based Office Equipment
Test Equipment and Measuring Instruments
GENERAL DESCRIPTION
The ADM1024 is a complete system hardware monitor for
microprocessor-based systems, providing measurement and limit
comparison of various system parameters. Eight measurement
inputs are provided; three are dedicated to monitoring 5 V and
12 V power supplies and the processor core voltage. The
ADM1024 can monitor a fourth power supply voltage by mea-
suring its own V
CC
. One input (two pins) is dedicated to a
remote temperature-sensing diode. Two more pins can be
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FUNCTIONAL BLOCK DIAGRAM
V
CC
VID0/IRQ0
VID1/IRQ1
VID2/IRQ2
VID3/IRQ3
100k
PULL-UPS
VID4/IRQ4
VID4 AND
DEVICE ID
REGISTER
FAN SPEED
COUNTER
ADDRESS
POINTER
REGISTER
VID0–3 AND
FAN DIVISOR
REGISTER
ADM1024
NTEST OUT/ADD
SERIAL BUS
INTERFACE
SDA
SCL
CHANNEL
MODE
REGISTER
VALUE AND
LIMIT
REGISTERS
FAN1/AIN1
FAN2/AIN2
+V
CCP1
+2.5V
IN
/D2+
+5V
IN
+12V
IN
V
CCP2
/D2–
D1+
D1–
POWER TO CHIP
V
CC
BAND GAP
TEMPERATURE
SENSOR
INPUT
ATTENUATORS
AND
ANALOG
MULTIPLEXER
LIMIT
COMPARATORS
INTERRUPT
STATUS
REGISTERS
INT
MASK
REGISTERS
INTERRUPT
MASKING
100k
CONFIGURATION
REGISTERS
INT
100k
THERM
V
CC
TEMPERATURE
CONFIGURATION
REGISTER
CI
V
CC
10-BIT ADC
ANALOG
OUTPUT
REGISTER AND
8-BIT DAC
CHASSIS
INTRUSION
CLEAR
REGISTER
100k
NTEST IN/AOUT
V
CC
2.5V
BAND GAP
REFERENCE
RESET
GND
REV. C
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 owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
© 2005 Analog Devices, Inc. All rights reserved.
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