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EVAL-ADM1022 Datasheet(PDF) 1 Page - Analog Devices

Part No. EVAL-ADM1022
Description  Evaluation Board for Microprocessor System Temperature Monitor
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com

EVAL-ADM1022 Datasheet(HTML) 1 Page - Analog Devices

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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
External Temperature Measurement with Remote Diode
(Two Channels)
On-Chip Temperature Sensor
Interrupt and Overtemperature Outputs
Fault Tolerant Fan Control
Brownout Detection
LDCM Support
I2C Compatible System Management Bus (SMBus)
Standby Mode to Minimize Power Consumption
Limit Comparison of all Monitored Values
Network Servers and Personal Computers
Microprocessor-Based Office Equipment
Test Equipment and Measuring Instruments
The evaluation system package contains the following
* This application note
* ADM1022 evaluation board
* DIMM interface card
* Centronics cable
* DIMM interface ribbon cable
* Evaluation software on floppy disks
The ADM1022 Evaluation Board allows the ADM1022
microprocessor system hardware monitor IC to be easily
evaluated using a personal computer. Using both the
evaluation board and its accompanying software, the
ADM1022 can be interfaced to any personal computer
running Windows
TM 95 or WindowsTM 98, via the
computer’s parallel printer port, or via the computer’s
SMBus using the DIMM interface card provided.
The evaluation board allows all the input and output func-
tions of the ADM1022 to be exercised without the need
for external components. The software allows control and
monitoring of the ADM1022’s internal registers.
The following gives a brief description of the ADM1022.
More detailed device information can be found in the
datasheet for the device. The ADM1022 is a hardware
temperature monitor for personal computers and other
microprocessor systems which features a three-channel
digital thermometer and over-temperature alarm. It can
also control the speed of a cooling fan.
The device can measure local temperature using an on-
chip diode connected transistor, or can use low cost, small
signal transistors such as the 2N3904 or 2N3906 to mea-
sure the temperatures of 2 external microprocessors. The
measurement technique implemented, cancels the absolute
value of the transistor’s base emitter voltage, so that no
calibration is required.
The ADM1022 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.
* ADM1022 I.C.
* NPN and PNP sensor transistors
* LED indicators for power, resets, interrupt, over-tem-
perature, fan off request, and fan full-on
* Switches for selecting voltage monitoring source, tem-
perature sensors, and for setting device’s SMBus address
* Interface buffers
* Connectors for parallel and SMBus interface
* Test connector
* 3.3V supply regulation circuit
* PC running Windows 95 or Windows 98
* 15Vdc 300mA regulated power supply

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