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ADM1031ARQZ Arkusz danych(PDF) 1 Page - ON Semiconductor |
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ADM1031ARQZ Arkusz danych(HTML) 1 Page - ON Semiconductor |
1 / 30 page © Semiconductor Components Industries, LLC, 2010 May, 2010 − Rev. 4 1 Publication Order Number: ADM1031/D 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 PentiumRIII, 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 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 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 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 throttle a CPU clock. Features • Optimized for Pentium III ♦ Reduced Guard−banding Software ♦ Automatic Fan Speed Control, Independent of CPU Intervention After Initial Setup • 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) • 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 http://onsemi.com xxx = Specific Device Code # = Pb−Free Package YY = Date Code WW = Work Week See detailed ordering and shipping information in the package dimensions section on page 29 of this data sheet. ORDERING INFORMATION MARKING DIAGRAM 1 1031A RQZ #YYWW QSOP−16 CASE 492 1 2 3 4 5 6 7 8 14 13 12 11 10 9 TACH1/AIN1 PWM_OUT2 TACH2/AIN2 THERM VCC GND PWM_OUT1 INT(SMBALERT) D1+ FAN_FAULT D1– D2– D2+ SCL ADM1031 16 15 SDA ADD PIN ASSIGNMENT |
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