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1 / 29 page a ADM1030* 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 that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective companies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved. REV. A Intelligent Temperature Monitor and PWM Fan Controller FUNCTIONAL BLOCK DIAGRAM SERIAL BUS INTERFACE INTERRUPT STATUS REGISTER VALUE AND LIMIT REGISTERS OFFSET REGISTERS CONFIGURATION REGISTER LIMIT COMPARATOR 2.5V BANDGAP REFERENCE ANALOG MULTIPLEXER BANDGAP TEMPERATURE SENSOR SLAVE ADDRESS REGISTER ADD SDA SCL GND ADM1030 FAN CHARACTERISTICS REGISTER FAN SPEED CONFIG REGISTER TMIN/TRANGE REGISTER FAN SPEED COUNTER ADDRESS POINTER REGISTER PWM CONTROLLER TACH SIGNAL CONDITIONING NC INT THERM FAN_FAULT NC NC NC PWM_OUT TACH/AIN D+ D– VCC ADC NC = NO CONNECT FEATURES Optimized for Pentium® III: Allows Reduced Guardbanding Software and Automatic Fan Speed Control Automatic Fan Speed Control Allows Control Independent of CPU Intervention after Initial Setup Control Loop Minimizes Acoustic Noise and Battery Consumption Remote Temperature Measurement Accurate to 1�C Using Remote Diode 0.125�C Resolution on Remote Temperature Channel Local Temperature Sensor with 0.25�C Resolution Pulsewidth Modulation Fan Control (PWM) Programmable PWM Frequency Programmable PWM Duty Cycle Tach Fan Speed Measurement 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 Programmable INT Output Pin Configurable Offset for All Temperature Channels 3 V to 5.5 V Supply Range Shutdown Mode to Minimize Power Consumption APPLICATIONS Notebook PCs, Network Servers and Personal Computers Telecommunications Equipment PRODUCT DESCRIPTION The ADM1030 is an ACPI-compliant two-channel digital ther- mometer and under/over temperature alarm, for use in computers and thermal management systems. Optimized for the Pentium III, the higher 1 C accuracy offered allows systems designers to safely reduce temperature guardbanding and increase system performance. A Pulsewidth Modulated (PWM) Fan Control out- put 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 pro- vides 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 temperature- sensing diode with an accuracy of ±1 C, 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. *Patents pending. ©2008 SCILLC. All rights reserved. Publication Order Number: February 2008 - Rev. 2 ADM1030/D |
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Mô tả tương tự - ADM1030ARQZ-RL7 |
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