ANALOG DEVICES EVAL-ADM1028 Service Manual
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Evaluation Board for PC Temperature
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FEATURES
On chip Temperature Sensor
External Temperature Measurement with Remote Diode
Interrupt and Overtemperature Outputs
Fault Tolerant Fan Control with Auto Hardware Trip Point
Remote Reset and Power Down Functions
LDCM Support
System Management Bus (SMBus) Communications
Standby 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
INTRODUCTION
The ADM1028 evaluation board allows the ADM1028
PC Temperature Monitor and Fan Control ASIC to be
quickly and easily evaluated using a personal computer.
Using the evaluation board and the accompanying
software the ADM1028 can be interfaced to any personal
computer running Windows 95 or Windows 98, via the
computers parallel port.
The evaluation board allows the input and output
functions of the ADM1028 to be exercised without the
need for external components. The software allows control
and monitoring of the ADM1028’s internal registers.
Monitor and Fan Control ASIC
EVAL-ADM1028
THE ADM1028
The following is a brief description of the ADM1028 and
a system overview. Further information can be found on
the ADM1028 datasheet.
The ADM1028 is a low cost temperature monitor and fan
controller for microprocessor based systems. The device
can measure the temperature of a microprocessor using an
on-chip diode connected transistor or can use a low cost
small signal transistor.
Measured values can be read out via the SMBus and
values for limit comparisons can be programmed in over
the same serial bus.
The ADM1028 also contains a DAC for fan speed
control. An automatic hardware temperature trip point is
provided and the fan will be driven to full speed if it is
exceeded.
The chip also has remote reset and power down
functionality, allowing it to be remotely shut down via the
SMBus.
EVALUATION SYSTEM PACKAGE CONTENTS
The evaluation system contains the following items
1. The ADM1028 Evaluation Board
2. Centronics Cable
3. CD containing this application note, datasheet and the
ADM1028 evaluation software.
REV. PrA 05/2000
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.
EVALUATION BOARD HARDWARE
The ADM1028 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.
1. ADM1028 IC
2. NPN sensor transistor
3. LED indicators
4. Interface Buffers
5. Connector for parallel interface.
6. Test Connector for connecting to remote thermal
sensor (J4)
7. Fan.
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
EVAL-ADM1028
V
DD
c
V
CC
PB1
PB2
V
PB3
V
CC
Fan Speed Signal
J6-2
J6 = Fan
Connector
Conditioning Block
J6-1
V
DD
D6
RED
INT
FAN_OFF
V
CC
V
CC
V
CC
CC
GPI
AUXRST
V
CC
GND
RST
R_RST
FAN_SPD
ADM10 28
INT
SCLK
SDATA
R_OFF
THERMB
THERMA
D+
D-
36-WAY
D3
CENTRONICS
CONNECT OR
(J1)*
V
DD
PARALLEL
BUFFERS
RED
D5, RED
THERMA
R_OFF
D4, RED
THERMB
S2
NPN
SENSOR
PC
PORT
Figure1. ADM1028 Evaluation Board Block Diagram
Figure2. ADM1028 Evaluation Board Silk Screen
–2– REV. PrA
EVAL-ADM1028
Figure3. ADM1028 Evaluation Board Schematic
–3–REV. PrA
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