Complete Thermal System
Management Controller
ADM1026
FEATURES
Full SMBus 1.1 support includes packet error checking (PEC)
Chassis intrusion detection
Interrupt output (SMBAlert)
Up to 19 analog measurement channels (including internal
measurements)
Reset input, reset outputs
Thermal interrupt (THERM) output
Limit comparison of all monitored values
Up to 8 fan speed measurement channels
Up to 17 general-purpose logic I/O pins
Remote temperature measurement with remote diode (two
channels)
APPLICATIONS
On-chip temperature sensor
Analog and PWM fan speed control outputs
2-wire serial system management bus (SMBus)
8 kB on-chip EEPROM
Network servers and personal computers
Telecommunications equipment
Test equipment and measuring instruments
ADD/
NTESTOUT
3.3V STBY 3.3V MAIN
SDA SCL
V
CC
RESET IN
GPIO15
GPIO14
GPIO13
3.3V MAIN
RESET
GENERATOR
RESETMAIN
GPIO12
SERIAL BUS
INTERFACE
V
GPIO
REGISTERS
CC
GPIO11
GPIO10
GPIO9
GPIO8
100kΩ
3.3V STBY
RESET
GENERATOR
RESETSTBY
PWM
V
CC
FAN7/GPIO7
FAN6/GPIO6
FAN5/GPIO5
PWM REGISTER
AND CONTROLLER
FAN
SPEED
COUNTER
FAN4/GPIO4
FAN3/GPIO3
FAN2/GPIO2
FAN1/GPIO1
FAN0/GPIO0
VALUE AND
LIMIT
REGISTERS
ADDRESS
POINTER
REGISTER
LIMIT
COMPARATORS
V
BAT
+5 V
–12 V
+12 V
IN
8k BYTES
EEPROM
INTERRUPT
STATUS
REGISTERS
IN
CI
IN
V
AUTOMATIC
FAN SPEED
CONTROL
CC
+V
CCP
A
A
A
A
A
A
(0V – +3V)
(0V – +3V)
(0V – +3V)
(0V – +3V)
(0V – +3V)
(0V – +3V)
100kΩ
IN0
IN1
IN2
IN3
IN4
IN5
INT MASK
REGISTERS
INT
INPUT
ATTENUATORS
AND
ANALOG
MULTIPLEXER
ADM1026
INTERRUPT
MASKING
V
CC
100kΩ
A
(0V – +2.5V)
(0V – +2.5V)
(0V – +2.5V)
(0V – +2.5V)
D1+
IN6
8-BIT
ADC
A
D2+/A
D2–/A
IN7
IN8
IN9
GPIO16/THERM
CONFIGURATION
REGISTERS
TO GPIO
REGISTERS
BAND GAP
REFERENCE
D1–/NTESTIN
ANALOG
OUTPUT REGISTER
AND 8-BIT DAC
DAC
BAND GAP
TEMPERATURE
SENSOR
AGND
DGND
V
(1.82V OR 2.5V)
REF
Figure 1. Functional Block Diagram
Rev. A
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