Complete Thermal System
Management Controller
ADM1026
FEATURES
Up to 19 analog measurement channels (including internal
measurements)
Up to 8 fan speed measurement channels
Up to 17 general-purpose logic I/O pins
Remote temperature measurement with remote diode (two
channels)
On-chip temperature sensor
Analog and PWM fan speed control outputs
2-wire serial system management bus (SMBus)
8 kB on-chip EEPROM
Full SMBus 1.1 support includes packet error checking (PEC)
Chassis intrusion detection
Interrupt output (SMBAlert)
Reset input, reset outputs
Thermal interrupt (THERM) output
Limit comparison of all monitored values
APPLICATIONS
Network servers and personal computers
Telecommunications equipment
Test equipment and measuring instruments
ADD/
NTESTOUT SDA
SCL 3.3V STBY
3.3V MAIN
V
CC
RESET IN
3.3V MAIN
RESET
GENERATOR
100kΩ
GPIO15
GPIO14
GPIO13
GPIO12
GPIO11
GPIO10
GPIO9
GPIO8
FAN 7/GPIO7
FAN 6/GPIO6
FAN 5/GPIO5
FAN 4/GPIO4
FAN 3/GPIO3
FAN 2/GPIO2
FAN 1/GPIO1
FAN 0/GPIO0
V
BAT
+5 V
IN
–12 V
IN
+12 V
IN
+V
CCP
A
IN0
(0V – +3V)
A
IN1
(0V – +3V)
A
IN2
(0V – +3V)
A
IN3
(0V – +3V)
A
IN4
(0V – +3V)
A
IN5
(0V – +3V)
A
IN6
(0V – +2.5V)
A
IN7
(0V – +2.5V)
D2+/A
IN8
(0V – +2.5V)
D2–/A
IN9
(0V – +2.5V)
D1+
D1–/NTESTIN
BAND GAP
TEMPERATURE
SENSOR
AGND
DGND
BAND GAP
REFERENCE
INPUT
ATTENUATORS
AND
ANALOG
MULTIPLEXER
FAN
SPEED
COUNTER
ADDRESS
POINTER
REGISTER
8k BYTES
EEPROM
AUTOMATIC
FAN SPEED
CONTROL
PWM REGISTER
AND CONTROLLER
VALUE AND
LIMIT
REGISTERS
V
CC
GPIO
REGISTERS
SERIAL BUS
INTERFACE
RESETMAIN
V
CC
3.3V STBY
RESET
GENERATOR
RESETSTBY
PWM
LIMIT
COMPARATORS
INTERRUPT
STATUS
REGISTERS
INT MASK
REGISTERS
CI
V
CC
100kΩ
INT
ADM1026
INTERRUPT
MASKING
8-BIT
ADC
CONFIGURATION
REGISTERS
ANALOG
OUTPUT REGISTER
AND 8-BIT DAC
V
CC
100kΩ
GPIO16/THERM
TO GPIO
REGISTERS
DAC
02657-A-001
V
REF
(1.82V OR 2.5V)
Figure 1. Functional Block Diagram
Rev. A
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 that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
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Tel: 781.329.4700
Fax: 781.326.8703
© 2004 Analog Devices, Inc. All rights reserved.
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