ADM1031ARQZ-REEL

Overview

The ADM1031ARQZ-REEL is a smart temperature monitoring and dual PWM fan control integrated circuit manufactured by onsemi. It functions as an ACPI-compatible digital thermometer with over/under-temperature alarm capabilities, optimized for Pentium III processors. The device integrates local and remote temperature sensing channels, featuring ±1°C local accuracy and ±0.5°C remote accuracy. It supports SMBus communication and provides dual PWM outputs for fan speed control and tachometer measurement.

Feature Summary

• Integrates dual PWM fan control outputs with automatic speed regulation loops
• Provides high-precision local and remote temperature sensing via internal and external diodes
• Supports SMBus interface for system management and programmable threshold configuration
• Includes THERM output for CPU throttling and INT pin for interrupt generation

Applications

• Pentium III processor thermal management systems
• Laptop computer cooling solutions
• Network server heat dissipation control
• Telecommunications equipment thermal monitoring

Procurement Notes

Verify component authenticity through authorized distribution channels due to obsolete status. Confirm package integrity upon receipt as the device utilizes surface-mount QSOP-16 packaging. Ensure compatibility with existing SMBbus protocols in legacy designs. Check for specific manufacturing date codes if long-term reliability is critical for deployed infrastructure.

Selection Notes

Select this component for applications requiring precise thermal regulation of legacy microprocessors. The dual-channel design allows simultaneous monitoring of CPU junction and ambient temperatures. Consider the integrated PWM functionality to reduce external component count compared to discrete sensor and controller combinations. Verify voltage supply requirements align with the specified operating range.

Part Context

This part belongs to the ADM1031 series of intelligent thermal management ICs. It represents a specialized solution for PC and server environments where ACPI compliance and direct processor integration are required. The device consolidates temperature acquisition, fan actuation, and system communication into a single package, simplifying board layout for thermal subsystems.

Replacement Considerations

Public confirmed substitute part numbers: None identified.