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ON Semiconductor - Intelligent Temperature Monitor and Dual PWM Fan Controller

Numéro de référence ADM1031
Description Intelligent Temperature Monitor and Dual PWM Fan Controller
Fabricant ON Semiconductor 
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ADM1031 fiche technique
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
PentiumIII, the part offers a 1C higher accuracy, which allows
system designers to safely reduce temperature guard-banding and
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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
QSOP16
CASE 492
monitored via TACH inputs, which can be reprogrammed as analog
inputs to allow speeds for 2-wire fans to be measured via sense
PIN ASSIGNMENT
resistors. The device also detects a stalled fan. A dedicated fan speed
control loop provides control without the intervention of CPU
PWM_OUT1 1
16 SCL
software. It also ensures that if the CPU or system locks up, each fan
TACH1/AIN1 2
15 SDA
can still be controlled based on temperature measurements, and the fan
PWM_OUT2 3
14 INT (SMBALERT)
speed is adjusted to correct any changes in system temperature. Fan
speed can also be controlled using existing ACPI software.
TACH2/AIN2 4
GND 5
ADM1031
13 ADD
12 D2+
Two inputs (4 pins) are dedicated to remote temperature-sensing
VCC 6
11 D2
diodes with an accuracy of 1C, and an on-chip temperature sensor
allows ambient temperature to be monitored. The device has a
THERM 7
FAN_FAULT 8
10 D1+
9 D1
programmable 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
MARKING DIAGRAM
throttle a CPU clock.
Features
Optimized for PentiumIII
Reduced Guard-banding Software
Automatic Fan Speed Control, Independent of CPU Intervention
1
1031A
RQZ
#YYWW
After Initial Setup
0.125C Resolution on External Temperature Channels
Control Loop to Minimal Acoustic Noise and Battery Consumption
1031ARQZ = Specific Device Code
# = Pb-Free Package
Remote Temperature Measurement Accurate to 1C
Using Remote Diode (Two Channels)
YY = Date Code
WW = Work Week
Local Sensor with 0.25C Resolution
Pulse Width Modulation (PWM) Fan Control for 2 Fans
Programmable PWM Frequency and PWM Duty Cycle
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 31 of this data sheet.
Tach Fan Speed Measurement (Two Channels)
Analog Input to Measure Fan Speed of 2-wire Fans
Programmable INT Output Pin
(Using Sense Resistor)
2-wire System Management Bus (SMBus) with ARA
Configurable Offsets for Temperature Channels 3.0 V
to 5.5 V Supply Range
Support
Overtemperature THERM Output Pin for CPU
Throttling
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

PagesPages 30
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