System Hardware Monitor with
Remote Diode Thermal Sensing
ADM1024
a
FEATURES
Up to Nine Measurement Channels
Inputs Programmable-to-Measure Analog Voltage, Fan
Speed or External Temperature
External Temperature Measurement with Remote
Diode (Two Channels)
On-Chip Temperature Sensor
Five Digital Inputs for VID Bits
LDCM Support
System Management Bus (SMBus)
Chassis Intrusion Detect
Interrupt and Over Temperature 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
PRODUCT 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, of which 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
measuring its own VCC. One input (two pins) is dedicated to a
remote temperature-sensing diode. Two further pins can be
(continued on page 7)
FUNCTIONAL BLOCK DIAGRAM
VCC
VID0/IRQ0
NTEST OUT/ADD
ADM1024
VID1/IRQ1
SERIAL BUS
INTERFACE
VID0–3 AND
FAN DIVISOR
REGISTER
VID2/IRQ2
VID3/IRQ3
100k�
PULLUPS
VID4/IRQ4
SCL
CHANNEL
MODE
REGISTER
VID4 AND
DEVICE ID
REGISTER
FAN SPEED
COUNTER
VALUE AND
LIMIT
REGISTERS
ADDRESS
POINTER
REGISTER
FAN1/AIN1
LIMIT
COMPARATORS
FAN2/AIN2
+VCCP1
+2.5VIN /D2+
+5VIN
INPUT
ATTENUATORS
AND
ANALOG
MULTIPLEXER
+12VIN
VCCP2 /D2–
TEMPERATURE
CONFIGURATION
REGISTER
BANDGAP
TEMPERATURE
SENSOR
INT MASK
REGISTERS
VCC
10-BIT ADC
2.5V
BANDGAP
REFERENCE
ANALOG
OUTPUT
REGISTER AND
8-BIT DAC
CHASSIS
INTRUSION
CLEAR
REGISTER
CI
100k�
VCC
THERM
100k�
INT
CONFIGURATION
REGISTERS
D1–
POWER TO CHIP
INTERRUPT
STATUS
REGISTERS
INTERRUPT
MASKING
D1+
VCC
SDA
VCC
NTEST IN/AOUT
100k�
RESET
GND
REVISION HISTORY
REV. A
02/08—Rev 1: Conversion to ON Semiconductor
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
©2008 SCILLC. All rights reserved. of patents or other rights of third parties
use, nor for any infringements
which 2008 - Rev. from its use. No license is granted by implication or
February may result 1
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Publication Order Number:
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
ADM1024/D
Fax: 781/326-8703
© Analog Devices, Inc., 2001
