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 1°C higher accuracy, which allows system designers to safely reduce temperature guard−banding and increase system performance.

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

Applications

• Notebook PCs, Network Servers, and Personal Computers

• Telecommunications Equipment

• 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