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ON Semiconductor - Intelligent Temperature Monitor and PWM Fan Controller

Numéro de référence ADM1030
Description Intelligent Temperature Monitor and PWM Fan Controller
Fabricant ON Semiconductor 
Logo ON Semiconductor 





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ADM1030 fiche technique
ADM1030
Intelligent Temperature
Monitor and PWM Fan
Controller
The ADM1030 is an ACPI-compliant two-channel digital
thermometer and under/over temperature alarm, for use in computers
and thermal management systems. Optimized for the PentiumIII,
the higher 1C accuracy offered allows systems designers to safely
reduce temperature guardbanding and increase system performance.
A Pulsewidth Modulated (PWM) Fan Control output 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
provides 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 temperaturesensing diode with an accuracy of
1C, 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.
http://onsemi.com
QSOP16
CASE 492
PIN ASSIGNMENT
PWM_OUT 1
16 SCL
TACH/AIN 2
15 SDA
NC 3
14 INT
NC 4
ADM1030
Top View
13 ADD
GND 5 (Not To Scale) 12 NC
VCC 6
THERM 7
11 NC
10 D+
FAN_FAULT 8
9 D
Features
Optimized for PentiumIII: Allows Reduced Guardbanding
NC = No Connect
Software and Automatic Fan Speed Control
Automatic Fan Speed Control Allows Control Independent of CPU
MARKING DIAGRAM
Intervention after Initial Setup
Control Loop Minimizes Acoustic Noise and Battery Consumption
Remote Temperature Measurement Accurate to 1C Using Remote
Diode
0.125C Resolution on Remote Temperature Channel
1030A
RQZ
#YYWW
Local Temperature Sensor with 0.25C Resolution
Pulsewidth Modulation Fan Control (PWM)
Programmable PWM Frequency
1029ARQZ
#
= Special Device Code
= Pb-Free Package
Programmable PWM Duty Cycle
Tach Fan Speed Measurement
YY = Year
WW = Work Week
Analog Input To Measure Fan Speed of 2-wire Fans
(Using Sense Resistor)
ORDERING INFORMATION
2-wire System Management Bus (SMBus) with ARA Support
Overtemperature THERM Output Pin
See detailed ordering and shipping information in the package
dimensions section on page 29 of this data sheet.
Programmable INT Output Pin
Configurable Offset for All Temperature Channels
3 V to 5.5 V Supply Range
Shutdown Mode to Minimize Power Consumption
This is a Pb-Free Device*
Applications
Notebook PCs, Network Servers and Personal
Computers
Telecommunications Equipment
* For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
Semiconductor Components Industries, LLC, 2012
April, 2012 Rev. 3
1
Publication Order Number:
ADM1030/D

PagesPages 30
Télécharger [ ADM1030 ]


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