參數(shù)資料
型號(hào)： ADM1031ARQZ-R7
廠商： ON SEMICONDUCTOR
元件分類(lèi)： 溫度/濕度傳感器
英文描述： DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT
封裝： LEAD FREE, QSOP-16
文件頁(yè)數(shù)： 1/30頁(yè)
文件大?。?/td> 299K
代理商： ADM1031ARQZ-R7
Semiconductor Components Industries, LLC, 2010
May, 2010 Rev. 4
1
Publication Order Number:
ADM1031/D
ADM1031
Intelligent Temperature
Monitor and Dual PWM Fan
Controller
The ADM1031 is an ACPIcompliant, threechannel digital
thermometer and under/overtemperature alarm for use in personal
computers and thermal management systems. Optimized for the
PentiumRIII, the part offers a 1
°C higher accuracy, which allows
system designers to safely reduce temperature guardbanding and
increase system performance.
Two PWM fan control outputs control the speed of two cooling fans
by varying output duty cycle. Duty cycle values between 33% and
100% allow smooth control of the fans. The speed of each fan can be
monitored via TACH inputs, which can be reprogrammed as analog
inputs to allow speeds for 2wire fans to be measured via sense
resistors. The device also detects a stalled fan. A dedicated fan speed
control loop provides control without the intervention of CPU
software. It also ensures that if the CPU or system locks up, each fan
can still be controlled based on temperature measurements, and the fan
speed is adjusted to correct any changes in system temperature. Fan
speed can also be controlled using existing ACPI software.
Two inputs (4 pins) are dedicated to remote temperaturesensing
diodes with an accuracy of
±1°C, and an onchip temperature sensor
allows ambient temperature to be monitored. The device has a
programmable INT output to indicate error conditions, and a dedicated
FAN_FAULT output to signal fan failure. The THERM pin is a
failsafe output for overtemperature conditions that can be used to
throttle a CPU clock.
Features
Optimized for Pentium III
Reduced Guardbanding Software
Automatic Fan Speed Control, Independent of CPU
Intervention After Initial Setup
0.125°C Resolution on External Temperature Channels
Control Loop to Minimal Acoustic Noise and Battery
Consumption
Remote Temperature Measurement Accurate to 1°C
Using Remote Diode (Two Channels)
Local Sensor with 0.25°C Resolution
Pulse Width Modulation (PWM) Fan Control for 2 Fans
Programmable PWM Frequency and PWM Duty Cycle
Tach Fan Speed Measurement (Two Channels)
Analog Input to Measure Fan Speed of 2Wire Fans
(Using Sense Resistor)
2Wire System Management Bus (SMBus) with ARA
Support
Overtemperature THERM Output Pin for CPU
Throttling
Programmable INT Output Pin
Configurable Offsets for Temperature Channels 3.0 V
to 5.5 V Supply Range
Shutdown Mode to Minimize Power Consumption
Limit Comparison of All Monitored Values
This is a PbFree Device
Applications
Notebook PCs, Network Servers, and Personal Computers
Telecommunications Equipment
http://onsemi.com
xxx
= Specific Device Code
#
= PbFree Package
YY
= Date Code
WW
= Work Week
See detailed ordering and shipping information in the package
dimensions section on page 29 of this data sheet.
ORDERING INFORMATION
MARKING DIAGRAM
1
1031A
RQZ
#YYWW
QSOP16
CASE 492
1
2
3
4
5
6
7
8
14
13
12
11
10
9
TACH1/AIN1
PWM_OUT2
TACH2/AIN2
THERM
VCC
GND
PWM_OUT1
INT(SMBALERT)
D1+
FAN_FAULT
D1–
D2–
D2+
SCL
ADM1031
16
15
SDA
ADD
PIN ASSIGNMENT
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