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ADM1031

更新时间: 2024-02-14 07:40:13
品牌 Logo 应用领域
亚德诺 - ADI 风扇监控控制器
页数 文件大小 规格书
32页 286K
描述
Intelligent Temperature Monitor and Dual PWM Fan Controller

ADM1031 技术参数

是否无铅: 不含铅是否Rohs认证: 符合
生命周期:ActiveReach Compliance Code:unknown
风险等级:5.28最大精度(摄氏度):3 Cel
主体宽度:3.91 mm主体高度:1.55 mm
主体长度或直径:4.9 mm外壳:PLASTIC
JESD-609代码:e3安装特点:SURFACE MOUNT
位数:8最大工作电流:3 mA
最高工作温度:100 °C最低工作温度:
输出接口类型:2-WIRE INTERFACE封装形状/形式:RECTANGULAR
传感器/换能器类型:TEMPERATURE SENSOR,SWITCH/DIGITAL OUTPUT,SERIAL最大供电电压:5.5 V
最小供电电压:3 V表面贴装:YES
端子面层:MATTE TIN端接类型:SOLDER
Base Number Matches:1

ADM1031 数据手册

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Intelligent Temperature  
Monitor and Dual PWM Fan Controller  
a
ADM1031  
PRODUCT DESCRIPTION  
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 (Two Channels)  
0.125؇C Resolution on External Temperature Channels  
Local Temperature Sensor with 0.25؇C Resolution  
Pulsewidth Modulation Fan Control (PWM) for Two Fans  
Programmable PWM Frequency  
The ADM1031 is an ACPI-compliant three-channel digital  
thermometer and under/over temperature alarm, for use in  
personal computers and thermal management systems. Opti-  
mized for the Pentium III, the higher 1°C accuracy offered  
allows systems designers to safely reduce temperature guard-  
banding and increase system performance. Two Pulsewidth  
Modulated (PWM) Fan Control outputs control the speed of  
two cooling fans by varying output duty cycle. Duty cycle values  
between 33%–100% allow smooth control of the fans. The speed  
of each fan can be monitored via TACH inputs. The TACH  
inputs may be reprogrammed as analog inputs, allowing fan  
speeds for 2-wire fans to be measured via sense resistors. The  
device will also detect a stalled fan. A dedicated Fan Speed  
Control Loop provides control even 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 measure-  
ments, and the fan speed adjusted to correct any changes in  
system temperature. Fan speed may also be controlled using  
existing ACPI software. Two inputs (four 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 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 overtemperature conditions that can be used to throttle a  
CPU clock.  
Programmable PWM Duty Cycle  
Tach Fan Speed Measurement (Two Channels)  
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 V to 5.5 V Supply Range  
Shutdown Mode to Minimize Power Consumption  
Limit Comparison of All Monitored Values  
APPLICATIONS  
Notebook PCs, Network Servers and Personal Computers  
Telecommunications Equipment  
FUNCTIONAL BLOCK DIAGRAM  
V
CC  
ADD  
SDA  
SCL  
SERIAL BUS  
INTERFACE  
SLAVE  
ADDRESS  
ADM1031  
REGISTER  
ADDRESS  
POINTER  
REGISTER  
FAN FILTER  
REGISTER  
INT (SMBALERT)  
THERM  
FAN  
CHARACTERISTICS  
REGISTERS  
INTERRUPT  
STATUS  
REGISTERS  
PWM  
CONTROLLERS  
FAN SPEED  
CONFIG  
REGISTER  
PWM_OUT1  
LIMIT  
COMPARATOR  
PWM_OUT2  
TACH2/AIN2  
TACH1/AIN1  
TACH SIGNAL  
CONDITIONING  
FAN SPEED  
COUNTER  
FAN_FAULT  
VALUE AND LIMIT  
REGISTERS  
D1+  
D1–  
D2+  
D2–  
OFFSET  
ANALOG  
MULTIPLEXER  
REGISTERS  
ADC  
CONFIGURATION  
REGISTERS  
2.5V  
BANDGAP  
REFERENCE  
BANDGAP  
TEMPERATURE  
SENSOR  
*Patents pending.  
Pentium is a registered  
trademark of Intel Corporation.  
GND  
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.  
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  

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