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ADM1030ARQZ-REEL View Datasheet(PDF) - ON Semiconductor

Part NameDescriptionManufacturer
ADM1030ARQZ-REEL Intelligent Temperature Monitor and PWM Fan Controller ON-Semiconductor
ON Semiconductor ON-Semiconductor
ADM1030ARQZ-REEL Datasheet PDF : 29 Pages
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a
Intelligent Temperature
Monitor and PWM Fan Controller
ADM1030*
FEATURES
Optimized for Pentium® III: Allows Reduced Guardbanding
Software and Automatic Fan Speed Control
Automatic Fan Speed Control Allows Control Independent
of CPU Intervention after Initial Setup
Control Loop Minimizes Acoustic Noise and Battery
Consumption
Remote Temperature Measurement Accurate to 1C
Using Remote Diode
0.125C Resolution on Remote Temperature Channel
Local Temperature Sensor with 0.25C Resolution
Pulsewidth Modulation Fan Control (PWM)
Programmable PWM Frequency
Programmable PWM Duty Cycle
Tach Fan Speed Measurement
Analog Input To Measure Fan Speed of 2-Wire Fans
(Using Sense Resistor)
2-Wire System Management Bus (SMBus) with ARA
Support
Overtemperature THERM Output Pin
Programmable INT Output Pin
Configurable Offset for All Temperature Channels
3 V to 5.5 V Supply Range
Shutdown Mode to Minimize Power Consumption
APPLICATIONS
Notebook PCs, Network Servers and Personal Computers
Telecommunications Equipment
PRODUCT DESCRIPTION
The ADM1030 is an ACPI-compliant two-channel digital ther-
mometer and under/over temperature alarm, for use in computers
and thermal management systems. Optimized for the Pentium
III, the higher 1rC accuracy offered allows systems designers to
safely reduce temperature guardbanding and increase system
performance. A Pulsewidth Modulated (PWM) Fan Control out-
put controls the speed of a cooling fan by varying output duty
cycle. Duty cycle values between 33%–100% allow smooth
control of the fan. The speed of the fan can be monitored via a
TACH input for a fan with a tach output. The TACH input can
be programmed as an analog input, allowing the speed of a 2-wire
fan to be determined via a sense resistor. The device will also
detect a stalled fan. A dedicated Fan Speed Control Loop pro-
vides control even without the intervention of CPU software. It
also ensures that if the CPU or system locks up, the fan can still
be controlled based on temperature measurements, and the fan
speed adjusted to correct any changes in system temperature.
Fan Speed may also be controlled using existing ACPI software.
One input (two pins) is dedicated to a remote temperature-
sensing diode with an accuracy of ± 1rC, and a local temperature
sensor allows ambient temperature to be monitored. The device
has a programmable INT output to indicate error conditions.
There is a dedicated FAN_FAULT output to signal fan failure.
The THERM pin is a fail-safe output for over-temperature
conditions that can be used to throttle a CPU clock.
FUNCTIONAL BLOCK DIAGRAM
VCC
NC
NC
PWM_OUT
TACH/AIN
D+
D–
*Patents pending.
ADM1030
PWM
CONTROLLER
TACH SIGNAL
CONDITIONING
SLAVE
ADDRESS
REGISTER
FAN
CHARACTERISTICS
REGISTER
FAN SPEED
CONFIG
REGISTER
TMIN / T RANGE
REGISTER
FAN
SPEED
COUNTER
BANDGAP
TEMPERATURE
SENSOR
ANALOG
MULTIPLEXER
ADC
2.5V
BANDGAP
REFERENCE
GND
SERIAL BUS
INTERFACE
ADDRESS
POINTER
REGISTER
INTERRUPT
STATUS
REGISTER
LIMIT
COMPARATOR
VALUE AND LIMIT
REGISTERS
OFFSET
REGISTERS
CONFIGURATION
REGISTER
ADD
SDA
SCL
NC
INT
THERM
FAN_FAULT
NC
NC = NO CONNECT
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
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Tel: 781/329-4700
PublicatiwonwOwrd.earnNaulomgb.ceor:m
Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rigAhDtsMr1e0s3e0rv/Ded.
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