Thermal Monitor and
Fan Speed (RPM) Controller
ADM1034
Look-up table for temperature-to-fan-speed control
Linear and discrete options for look-up table
FAN_FAULToutput
FEATURES
1 local and 2 remote temperature channels
1ꢀ° accuracy on local and remote channels
Automatic remote temperature channels, up to 1 kΩ
Fast (up to 64 measurements per second)
SMBus 2.0, 1.1, and 1.0 compliant
THERM input, used to time PRO°HOT assertions
REF input, used as reference for THERM (PRO°HOT)
3 V to 5.5 V supply
SMBus address input/LO°ATION input to UDID
Programmable over-/undertemperature limits
Programmable fault queue
SMBusALERT output
Fail-safe overtemperature comparator output
Fan speed (RPM) controller
Small 16-lead QSOP package
APPLI°ATIONS
Desktop and notebook P°s
Embedded systems
Telecommunications equipment
L°D projectors
FUN°TIONAL BLO°K DIAGRAM
V
CC
6
SMBUS
ADDRESS
ADM1034
16
15
SCL
SDA
SERIAL BUS
INTERFACE
MANUAL FAN
SPEED CONTROL
REGISTERS
ADDRESS
POINTER
REGISTER
8
FAN_FAULT
TEMPERATURE-TO-
FAN-SPEED
LOOK-UP TABLE
ALERT
THERM
MASK
REGISTERS
FAULT
QUEUE
14
7
ALERT
THERM
STATUS
REGISTER
1
3
DRIVE1
DRIVE2
FAN SPEED
CONTROLLER
FAN RESPONSE
LIMIT
COMPARATOR
VALUE AND
LIMIT
REGISTERS
THERM PERCENT
TIMER
2
4
TACH1
TACH2
FAN
SPEED
COUNTER
TACH SIGNAL
CONDITIONING
FAULT
QUEUE
8
13
9
REF
HYSTERESIS
REGISTERS
LOCATION
D1–
D1+
ADC
ANALOG
MULTIPLEXER
OFFSET
REGISTERS
10
SRC
BLOCK
D2– 11
12
CONVERSION
RATE REGISTER
BAND GAP
REFERENCE
D2+
BAND GAP
TEMPERATURE
SENSOR
CONFIGURATION
REGISTERS
5
GND
Figure 1.
Rev. 0
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