參數(shù)資料
型號(hào)： ADM1030ARQ
廠商： ANALOG DEVICES INC
元件分類(lèi)： 溫度/濕度傳感器
英文描述： Intelligent Temperature Monitor and PWM Fan Controller
中文描述： DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 1Cel, RECTANGULAR, SURFACE MOUNT
封裝： MO-137AB, QSOP-16
文件頁(yè)數(shù)： 1/28頁(yè)
文件大小： 278K
代理商： ADM1030ARQ
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
ADM1030
*
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
www.analog.com
Analog Devices, Inc., 2001
Intelligent Temperature
Monitor and PWM Fan Controller
FUNCTIONAL BLOCK DIAGRAM
SERIAL BUS
INTERFACE
INTERRUPT
STATUS
REGISTER
VALUE AND LIMIT
REGISTERS
OFFSET
REGISTERS
CONFIGURATION
REGISTER
LIMIT
COMPARATOR
2.5V
BANDGAP
REFERENCE
ANALOG
MULTIPLEXER
BANDGAP
TEMPERATURE
SENSOR
SLAVE
ADDRESS
REGISTER
ADD
SDA
SCL
GND
ADM1030
FAN
CHARACTERISTICS
REGISTER
FAN SPEED
CONFIG
REGISTER
T
/T
REGISTER
FAN
SPEED
COUNTER
ADDRESS
POINTER
REGISTER
PWM
CONTROLLER
TACH SIGNAL
CONDITIONING
NC
INT
THERM
FAN_FAULT
NC
NC
NC
PWM_OUT
TACH/AIN
D+
D–
V
CC
ADC
NC = NO CONNECT
FEATURES
Optimized for Pentium
III: Allows Reduced Guardbanding
Software and Automatic Fan Speed Control
Automatic Fan Speed Control Allows Control Indepen-
dent of CPU Intervention after Initial Setup
Control Loop Minimizes Acoustic Noise and Battery
Consumption
Remote Temperature Measurement Accurate to 1 C
Using Remote Diode
0.125 C Resolution on Remote Temperature Channel
Local Temperature Sensor with 0.25 C 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 1
°
C 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
±
1
°
C, 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.
*
Patents pending.
Pentium is a registered
trademark of Intel Corporation.
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