ADM1031ARQZ-REEL7

Overview

The ADM1031ARQZ-REEL7 is an ACPI-compliant, three-channel digital thermometer and under/overtemperature alarm designed for personal computers and thermal management systems. It features a 1°C accuracy on remote diode channels and 0.25°C resolution on the local sensor. The device includes dual PWM fan control with programmable frequency and duty cycle, tachometer measurement for two fans, and analog input for two-wire fan speed sensing via a sense resistor. It operates on a 3.0 V to 5.5 V supply range and supports SMBus communication with ARA.

Feature Summary

• Intelligent temperature monitoring with optimized accuracy for Pentium III systems
• Dual independent PWM fan control with automatic speed regulation
• SMBus interface with Automatic Restart Address (ARA) support
• Configurable overtemperature THERM output for CPU throttling

Applications

• Notebook PCs
• Network Servers
• Personal Computers
• Telecommunications Equipment

Procurement Notes

Verify component authenticity through authorized distribution channels due to discontinued status. Confirm package integrity and pin alignment against QSOP-24 specifications. Validate datasheet revision compatibility with existing system firmware. Ensure storage conditions meet moisture sensitivity level requirements prior to assembly.

Selection Notes

Select this component for systems requiring ACPI-compliant thermal management with precise remote temperature sensing. Ideal for designs needing independent fan control loops without CPU intervention after initial setup. Suitable for applications where reducing temperature guard-banding is necessary to maximize system performance while maintaining acoustic noise limits.

Part Context

This part belongs to the ADM1031 series of intelligent temperature monitors and dual PWM fan controllers manufactured by onsemi. It is specifically optimized for Pentium III-based architectures to allow reduced guard-banding software. The device integrates multiple sensing capabilities into a single chip, simplifying thermal design in compact computing environments.

Replacement Considerations

Check for ADM1031 variants with different suffixes or packaging options. Verify functional equivalence regarding SMBus addressing and PWM configuration registers before substitution.