EvaluationBoardforMicroprocessor
SystemTemperatureMonitor
a
Preliminary Technical Data
EVAL - ADM1023
FEATURES
T H E AD M 1023
Next Generation upgrade to the ADM1021
On-Chip and Rem ote Tem perature Sensing
Offset Registers for System Calibration
1°C Accuracy and Resolution on Local Channel
0.125°C Resolution/ 1°C Accuracy on Rem ote Channel
Program m able Over/ Under Tem perature Lim its
Program m able Conversion Rate
2-Wire SMBus Serial Interface
Supports System Managem ent Bus (SMBus ) Alert
160µA Max Operating Current
T he following is a brief description of the ADM1023 and
a system overview. Further information can be found in
the datasheet for the device.
T he ADM1023 is a hardware temperature monitor for
personal computers and other microprocessor systems
which features a two-channel digital thermometer and
over/under temperature alarm.
T he device can measure the temperature of a
microprocessor using on-chip diode connected transistor
or can use a low cost small signal transistor such as the
2N3904 or the 2N3906. T he measurment technique
cancels the absolute value of the transistor’s base emitter
voltage, so that no calibration is required.
3µΑ Standby Current
3V to 5.5V Supply
Sm all 16-Lead QSOP Package
APPLICATIONS
Desktop Com puters
Notebook Com puters
Sm art Batteries
Industrial Controllers
Telecom s Equipm ent
Instrum entation
E VALU AT IO N SYST E M P AC KAG E C O NT E NT S
T he evaluation system contains the following items
T his application note
AD M 1023 Evaluation Board
C entronics C able
Evaluation Software on 3 floppy disks
I N T R O D U C T I O N
T he ADM1023 Evaluation Board allows the ADM1023
microprocessor system temperature IC to be quickly and
easily evaluated using a personal computer. Using the
evaluation board and its accompanying software the
ADM1023 can be interfaced to any personal computer
running Windows 95 or Windows 98, via the
computer’s parallel printer port.
E VALU AT IO N B O ARD H ARD WARE
T he ADM1023 evaluation board contains the following
main components which can be identified from the block
diagram, printed circuit board silk screen and schematic
diagram of figures 1, 2 and 3 overleaf.
AD M 1023 IC
T he evaluation board allows the input and output
functions of the ADM1023 to be exercised without the
need for external components. T he software allows control
and monitoring of the ADM1023’s internal registers.
NPN sensor transistor
LED indicators for power and Alert
Jumpers for selecting sensor and for setting SMBus
address
Interface buffers
Connector for parallel interface
T est connector for connecting to CPU T ransistor
REV. A 11/10/99
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
Windows is a registered trademark of Microsoft Corporation
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.
Tel: 781/ 329-4700
Fax: 781/ 326-8703
World Wide Web Site: http:/ / w w w.analog.com
Analog Devices, Inc., 1998
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