a
Low Cost Microprocessor
System Hardware Monitor
ADM9240
FEATURES
Six Direct Voltage Measurement Inputs (Including Two
Processor Core Voltages) with On-Chip Attenuators
On-Chip Temperature Sensor
Five Digital Inputs for VID Bits
Fully Supports Intel’s LANDesk Client Manager (LDCM)
Register-Compatible with LM7x Products
Two Fan Speed Monitoring Inputs
I2 C ® Compatible System Management Bus (SMBus)
Chassis Intrusion Detect
Interrupt Output
Programmable RESET I/O 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 ADM9240 is a complete system hardware monitor for
microprocessor-based systems, providing measurement and
limit comparison of up to four power supplies and two processor core voltages, plus temperature, two fan speeds and chassis
intrusion. Measured values can be read out via an I2C-compatible serial System Management Bus, and values for limit comparisons can be programmed in over the same serial bus. The
high speed successive approximation ADC allows frequent
sampling of all analog channels to ensure a fast interrupt
response to any out-of-limit measurement.
The ADM9240’s 2.85 V to 5.75 V supply voltage range, low
supply current and I2C compatible interface, make it ideal for a
wide range of applications. These include hardware monitoring
and protection applications in personal computers, electronic
test equipment and office electronics.
FUNCTIONAL BLOCK DIAGRAM
VCC
VID0
VID1
VID0 - 3 AND
FAN DIVISOR
REGISTERS
VID2
NTEST_OUT/A0
SERIAL BUS
ADDRESS
REGISTER
SERIAL BUS
INTERFACE
VID3
A1
SDA
SCL
VID4 AND
DEVICE ID
REGISTER
VID4
FAN1
VALUE AND LIMIT
REGISTERS
LIMIT
COMPARATORS
FAN SPEED
COUNTER
FAN2
CI
ADDRESS
POINTER
REGISTER
+VCCP1
+2.5VIN
+3.3VIN
INPUT
ATTENUATORS
AND
ANALOG
MULTIPLEXER
+5VIN
+12VIN
TEMPERATURE
CONFIGURATION
REGISTER
INT MASK
REGISTERS
INT
CONFIGURATION
REGISTER
9-BIT ADC
ANALOG
OUTPUT REGISTER
AND 8-BIT DAC
+VCCP2
BANDGAP
TEMPERATURE
SENSOR
INTERRUPT
STATUS
REGISTERS
ADM9240
GNDA
CHASSIS
INTRUSION
CLEAR REGISTER
NTEST_IN/AOUT
RESET
GNDD
I2 C is a registered trademark of Philips Corporation.
REV. 0
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1998
