ADT7467ARQZ-R7

Overview

The ADT7467ARQZ-R7 is a dbCOOL remote thermal monitor and fan controller designed for noise-sensitive or power-sensitive applications. It features an SMBus interface, three PWM outputs, and four tachometer inputs to manage up to four fans. The device includes one on-chip and two remote temperature sensors with series resistance cancellation. It supports high and low frequency drive signals, dynamic TMIN control, and enhanced acoustic modes. Electrical specifications include a supply voltage range of 3.0 V to 5.5 V, local sensor accuracy of ±1.5°C at 25°C, and an extended temperature measurement range from -64°C to +191°C.

Feature Summary

• Controls and monitors up to four fans using three PWM outputs and four tachometer inputs.
• Features one on-chip and two remote temperature sensors with series resistance cancellation.
• Supports both high frequency (22.5 kHz) and low frequency (10 Hz to 100 Hz) fan drive signals.
• Includes dynamic TMIN control mode and enhanced acoustic mode for intelligent system acoustics management.

Applications

• Noise-sensitive computer systems requiring active cooling
• Power-sensitive applications optimizing fan speed based on temperature
• Systems monitoring Intel Pentium 4 processor performance impact

Procurement Notes

Verify the component matches the specific ADT7467ARQZ-R7 designation, noting the R7 suffix indicates reel packaging. Confirm the manufacturer is ON Semiconductor and check for Pb-Free and RoHS compliance status as documented in the datasheet. Ensure the QSOP-16 package type aligns with your board design requirements before procurement.

Selection Notes

Select this component when multiple fan control and precise thermal monitoring are required via SMBus. It is suitable for designs needing series resistance cancellation on remote channels and programmable fan drive frequencies. Consider its compatibility with Intel Pentium 4 PROCHOT signals if thermal protection logic is needed.

Part Context

The ADT7467 is part of ON Semiconductor's dbCOOL family of thermal controllers. It serves as an upgrade to the ADT7460, offering additional features like high-frequency drive options, extended temperature ranges, and series resistance cancellation. The device integrates analog-to-digital conversion and serial bus interfaces into a single QSOP-16 package.

Replacement Considerations

The ADT7460 is a compatible predecessor but lacks high-frequency drive support and series resistance cancellation. Verify register map differences and pin configurations when substituting. No other direct public substitutes are confirmed in the provided documentation.

FAQ

What is the function of Pin 9 on the ADT7467?

Pin 9 can be configured as TACH4, THERM, SMBALERT, or GPIO depending on the settings in Configuration Register 4.

How does the ADT7467 handle fail-safe cooling?

If the measured temperature exceeds the THERM limit of 100°C, fans run at full speed. Additionally, fans operate at full speed if the SMBus is not addressed within 4.6 seconds of VCCP power-up.