ADT7460ARQ

Overview

The ADT7460ARQ is a dBCOOL remote thermal monitor and fan controller designed for noise-sensitive applications. It features one on-chip and two remote temperature sensors, monitoring up to four fans via PWM outputs. The device supports SMBus 2.0 communication with a default slave address of 0x2E. Supply voltage ranges from 3.0 V to 5.5 V. Local sensor accuracy is ±1.5°C at 0°C to 70°C and ±3°C across the full -40°C to +120°C range. Remote diode accuracy is ±1.5°C at 0°C to 70°C and ±3°C at -40°C to +120°C. Fan speed measurement accuracy is ±7% at 0°C to 70°C.

Feature Summary

• Controls and monitors up to four fan speeds using pulse-width modulation outputs.
• Integrates one on-chip bandgap sensor and supports two external remote diode sensors.
• Features dynamic TMIN control mode to intelligently optimize system acoustics and cooling.
• Includes enhanced acoustic mode to reduce user perception of changing fan speeds.

Applications

• Low acoustic noise PCs
• Networking equipment
• Telecommunications equipment

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm package type and tape/reel specifications. Ensure the component matches the required SMBus address configuration options if multiple devices are used in a single system design.

Selection Notes

Select this component for systems requiring active cooling with strict acoustic constraints. It is suitable for environments needing precise thermal management of CPUs and chassis components. Verify that the application supports SMBus communication protocols and has available tachometer inputs for fan speed feedback.

Part Context

The ADT7460 belongs to the dBCOOL family of thermal controllers developed by Analog Devices, now distributed by onsemi. This series focuses on reducing acoustic noise in computing and networking hardware while maintaining effective thermal regulation through intelligent fan speed control algorithms.

Replacement Considerations

Public confirmed substitute part numbers: None identified in source material.

FAQ

How is the SMBus slave address configured?

The default address is 0x2E. To change it, Pin 8 (PWM3/ADDRESS ENABLE) must be pulled low on power-up, allowing Pin 9 (TACH4/ADDRESS SELECT/THERM) to determine the address as either 0x2C or 0x2D.

What is the function of the THERM pin?

The THERM pin is bidirectional. It can monitor assertions from a processor thermal control circuit (like Intel Pentium 4 PROCHOT) or function as an output to signal overtemperature conditions for thermal protection.