参数资料
| 型号： | EVAL-ADM1031EB |
| 厂商： | ON Semiconductor |
| 文件页数： | 1/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADM1031 |
| 标准包装： | 1 |
| 类型： | 温度传感器 |
| 适用于相关产品： | ADM1031 |
| 所含物品： | 评估板 |
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ADM1031
Intelligent Temperature
Monitor and Dual PWM Fan
Controller
The ADM1031 is an ACPI-compliant, three-channel digital
thermometer and under/overtemperature alarm for use in personal
computers and thermal management systems. Optimized for the
Pentium ? III, the part offers a 1 ? C higher accuracy, which allows
system designers to safely reduce temperature guard-banding 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 2-wire fans to be measured via sense
resistors. The device also detects a stalled fan. A dedicated fan speed
http://onsemi.com
QSOP ? 16
CASE 492
PIN ASSIGNMENT
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
PWM_OUT1 1
TACH1/AIN1 2
PWM_OUT2 3
16 SCL
15 SDA
14 INT (SMBALERT)
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 temperature-sensing
diodes with an accuracy of ? 1 ? C, and an on-chip temperature sensor
allows ambient temperature to be monitored. The device has a
TACH2/AIN2 4
GND 5
V CC 6
THERM 7
FAN_FAULT 8
ADM1031
13 ADD
12 D2+
11 D2 ?
10 D1+
9 D1 ?
programmabl e INT output to indicate error conditions, and a dedicated
FAN_FAULT output to signal fan failure. The THERM pin is a
fail-safe output for overtemperature conditions that can be used to
throttle a CPU clock.
MARKING DIAGRAM
Features
? Optimized for Pentium ? III
? Reduced Guard-banding Software
? Automatic Fan Speed Control, Independent of CPU Intervention
After Initial Setup
1
1031A
RQZ
#YYWW
?
?
?
?
?
?
?
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)
1031ARQZ = Specific Device Code
# = Pb-Free Package
YY = Date Code
WW = Work Week
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 31 of this data sheet.
?
?
?
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 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 Pb-Free Device
Applications
? Notebook PCs, Network Servers, and Personal
Computers
? Telecommunications Equipment
? Semiconductor Components Industries, LLC, 2012
April, 2012 ? Rev. 5
1
Publication Order Number:
ADM1031/D
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