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ADM1034 Datasheet

Thermal Monitor and Fan Speed (RPM) Controller

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ADM1034 pdf
Thermal Monitor and
Fan Speed (RPM) Controller
ADM1034
FEATURES
1 local and 2 remote temperature channels
±1°C 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
SMBus address input/LOCATION input to UDID
Programmable over-/undertemperature limits
Programmable fault queue
SMBusALERT output
Fail-safe overtemperature comparator output
Fan speed (RPM) controller
Look-up table for temperature-to-fan-speed control
Linear and discrete options for look-up table
FAN_FAULToutput
THERM input, used to time PROCHOT assertions
REF input, used as reference for THERM (PROCHOT)
3 V to 5.5 V supply
Small 16-lead QSOP package
APPLICATIONS
Desktop and notebook PCs
Embedded systems
Telecommunications equipment
LCD projectors
FUNCTIONAL BLOCK DIAGRAM
VCC
6
ADM1034
DRIVE1 1
DRIVE2 3
MANUAL FAN
SPEED CONTROL
REGISTERS
TEMPERATURE-TO-
FAN-SPEED
LOOK-UP TABLE
FAN SPEED
CONTROLLER
FAN RESPONSE
SMBUS
ADDRESS
SERIAL BUS
INTERFACE
ADDRESS
POINTER
REGISTER
STATUS
REGISTER
ALERT
THERM
MASK
REGISTERS
LIMIT
COMPARATOR
FAULT
QUEUE
16 SCL
15 SDA
8 FAN_FAULT
14 ALERT
7 THERM
TACH1 2
TACH2 4
TACH SIGNAL
CONDITIONING
REF 8
LOCATION 13
D1– 9
D1+ 10
D2– 11
D2+ 12
SRC
BLOCK
BAND GAP
TEMPERATURE
SENSOR
ANALOG
MULTIPLEXER
FAN
SPEED
COUNTER
ADC
VALUE AND
LIMIT
REGISTERS
FAULT
QUEUE
HYSTERESIS
REGISTERS
OFFSET
REGISTERS
BAND GAP
REFERENCE
CONVERSION
RATE REGISTER
CONFIGURATION
REGISTERS
5
GND
Figure 1.
THERM PERCENT
TIMER
Rev. 0
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

ADM1034 Datasheet

Thermal Monitor and Fan Speed (RPM) Controller

No Preview Available !

ADM1034 pdf
ADM1034
TABLE OF CONTENTS
Specifications..................................................................................... 4
Absolute Maximum Ratings............................................................ 6
Thermal Characteristics .............................................................. 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 8
Functional Description .................................................................. 10
Internal Registers........................................................................ 10
Serial Bus Interface..................................................................... 10
Location Input............................................................................. 10
SMBus 2.0 ARP-Capable Mode ................................................ 10
SMBus 2.0 Fixed-and-Discoverable Mode.............................. 12
SMBus 2.0 Read and Write Operations ................................... 12
Register Addresses for Single/Block Byte Modes ................... 14
Write Operations ........................................................................ 14
Read Operations ......................................................................... 15
SMBus Timeout .......................................................................... 15
Packet Error Checking (PEC) ................................................... 15
Alert Response Address (ARA) ................................................ 15
Temperature Measurement System.............................................. 16
Internal Temperature Measurement ........................................ 16
Remote Temperature Measurement......................................... 16
Additional Functions ................................................................. 18
Layout Considerations ................................................................... 19
Limits, Status Registers, and Interrupts ....................................... 20
8-Bit Limits.................................................................................. 20
Out-of-Limit Comparisons ....................................................... 20
Analog Monitoring Cycle Time................................................ 20
Status Registers ........................................................................... 20
REVISION HISTORY
8/04—Revision 0: Initial Version
ALERT Interrupt Behavior ....................................................... 21
Handling SMBUSALERT Interrupts ....................................... 22
Interrupt Masking Register ....................................................... 22
FAN_FAULT Output ................................................................. 23
Fault Queue ................................................................................. 23
Conversion Rate Register .......................................................... 23
THERM I/O Timer and Limits ................................................ 23
THERM % Limit Register ......................................................... 24
Fan Drive Signal ......................................................................... 25
Synchronous Speed Control ..................................................... 25
Fan Inputs.................................................................................... 26
Fan Speed Measurement ........................................................... 26
Fan Speed Measurement Registers........................................... 27
Reading Fan Speed ..................................................................... 27
Calculating Fan Speed ............................................................... 27
Alarm Speed................................................................................ 27
Look-Up Table: Modes of Operation....................................... 28
Setting Up the Size of the Look-Up Table............................... 29
Setting Up the Look-Up Table in Linear Mode...................... 29
Setting Which Temperature Channel Controls a Fan ........... 29
Look-Up Table Hysteresis ......................................................... 29
Programming the THERM Limit for Each Temperature
Channel........................................................................................ 30
XOR Tree Test Mode.................................................................. 30
Lock Bit........................................................................................ 30
SW Reset...................................................................................... 30
Outline Dimensions ....................................................................... 40
Ordering Guide .......................................................................... 40
Rev. 0 | Page 2 of 40


Part Number ADM1034
Description Thermal Monitor and Fan Speed (RPM) Controller
Maker Analog Devices
Total Page 30 Pages
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