ADT7490ARQZ-R7

Thermal Management Overview

The ADT7490ARQZ-R7 is a remote thermal monitor and fan controller manufactured by onsemi, designed for noise-sensitive or power-sensitive applications requiring active system cooling. It features one local on-chip temperature sensor, two remote temperature sensors with series resistance cancellation, and supports up to three external temperature sensors. The device monitors CPU temperature via a PECI interface and drives fans using low or high frequency PWM signals. It measures and controls the speed of up to four fans to minimize acoustic noise while maintaining thermal protection through a bidirectional THERM/SMBALERT pin.

Thermal Management Feature Summary

• Integrated local and remote temperature sensing with series resistance cancellation
• PECI interface support for CPU thermal information and multi-input monitoring
• Automatic fan speed control based on thermal data with dynamic TMIN optimization
• Bidirectional THERM/SMBALERT pin for overtemperature condition signaling

Thermal Management Applications

• Personal computers
• Servers

Thermal Management Procurement Notes

Verify component authenticity and datasheet revision status before integration. Confirm package type QSOP-24 compatibility with PCB footprint. Check for lead-free compliance documentation. Ensure handling precautions for ESD sensitivity are followed during assembly. Validate operating temperature range requirements against application environment specifications.

Thermal Management Selection Notes

Select this component when multiple fan control channels and precise thermal monitoring are required. Consider its compatibility with SMBus interfaces for system management. Evaluate its suitability for applications needing CPU temperature tracking via PECI. Assess if its GPIO functionality meets additional loadline setting or LED control needs.

Thermal Management Part Context

The ADT7490 belongs to the dBCool family of thermal monitors and fan controllers from onsemi. It shares footprint and register compatibility with the ADT7473/ADT7475/ADT7476/ADT7476A family, facilitating design transitions. This integration allows for standardized thermal management solutions across various product lines within the manufacturer's portfolio.

Thermal Management Replacement Considerations

Public confirmed substitute part numbers: ADT7473, ADT7475, ADT7476, ADT7476A.