ADT7490ARQZ-REEL7

Thermal Management Overview

The ADT7490ARQZ-REEL7 is a remote thermal monitor and fan controller manufactured by onsemi. It features one local on-chip temperature sensor, two remote diode sensors with series resistance cancellation, and supports up to three external current sensors. The device includes a PECI interface for CPU thermal information and monitors up to four PECI inputs on a single pin. It provides three high-frequency or low-frequency PWM outputs for driving fans and four TACH inputs for speed measurement. Operating voltage ranges from 3.0 V to 3.6 V, with an operating temperature range of -40°C to +125°C. It communicates via SMBus.

Thermal Management Feature Summary

• Integrates local, remote, and PECI-based temperature sensing capabilities for comprehensive system thermal monitoring.
• Provides automatic fan speed control using multiple thermal inputs to optimize acoustic noise and power consumption.
• Supports dynamic TMIN control mode to enhance system acoustics without complex programming.
• Includes GPIO functionality for loadline setting, LED control, and other auxiliary functions.

Thermal Management Applications

• Personal Computers
• Servers

Thermal Management Procurement Notes

Verify the specific REEL7 suffix indicates tape-and-reel packaging when sourcing components. Confirm the manufacturer is onsemi, as this part was previously associated with Analog Devices. Check for end-of-life status or obsolescence notices, as older revisions may have limited availability. Ensure the QSOP-24 package matches your PCB footprint requirements.

Thermal Management Selection Notes

Select this component for systems requiring active cooling with minimal acoustic noise. It is suitable for applications needing integration of PECI data alongside traditional thermal sensors. Verify compatibility with existing SMBus infrastructure. Consider the pin and register compatibility with the ADT7473/ADT7475/ADT7476 family if migrating from previous designs.

Thermal Management Part Context

The ADT7490 belongs to the dBCool family of thermal monitors and fan controllers designed for noise-sensitive and power-sensitive applications. It serves as a replacement or upgrade for earlier models like the ADT7476A, offering enhanced features such as PECI interface support and dynamic TMIN control while maintaining footprint compatibility.

Thermal Management Replacement Considerations

The ADT7490 is footprint and register compatible with the ADT7473, ADT7475, ADT7476, and ADT7476A families. These parts can be considered direct replacements in existing designs, provided the additional PECI and GPIO features are accounted for in the software configuration.