MAX6664AEE+T

Thermal Management Overview

The MAX6664AEE+T is an ACPI-compliant local and remote-junction temperature sensor and fan controller. It measures its own die temperature and a remote PN junction, controlling DC cooling fan speed based on these readings. Remote accuracy is ±1°C from +60°C to +100°C with 0.125°C resolution for both channels. The device operates over a -40°C to +125°C range with a +3V to +5.5V supply. It features programmable alarms, SMBus interface, PWM output, and fan fault monitoring in a 16-pin QSOP package.

Thermal Management Feature Summary

• ACPI-compliant local and remote temperature sensing with high precision
• Programmable thermal alarms and automatic or manual fan-speed control
• SMBus serial interface with timeout protection and alert response address
• PWM fan control output with adjustable rise/fall times and tachometer monitoring

Thermal Management Applications

• Personal Computers
• Servers
• Workstations
• Telecom Equipment
• Networking Equipment

Thermal Management Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging when sourcing. Confirm the component is the MAX6664 variant rather than the MAX6653 or MAX6663, as pin configurations and shutdown outputs differ. Ensure the supplier provides original manufacturer documentation to validate authenticity and revision status before integration into designs.

Thermal Management Selection Notes

Select this component for systems requiring precise CPU or board temperature monitoring with integrated fan regulation. It is suitable where ACPI compliance and SMBus connectivity are required. Consider the MAX6653 if additional hardware shutdown outputs (SDL/SDR) are needed, or the MAX6663 if those specific pins are not utilized in the design.

Thermal Management Part Context

This part belongs to the MAX6653/MAX6663/MAX6664 family of thermal monitors. These devices are designed for microprocessor-based systems to ensure reliability through active thermal management. The MAX6664 specifically omits the dedicated shutdown outputs found in the MAX6653, offering a streamlined interface for standard temperature and fan control applications.

Thermal Management Replacement Considerations

MAX6663AEE+T

Thermal Management FAQ

How does the MAX6664 handle SMBus communication failures?

The device includes an SMBus timeout feature that prevents it from locking the bus. Additionally, hard-wired default values for critical temperature set points via CRIT0 and CRIT1 pins ensure proper operation even if the SMBus is locked.

What is the function of the THERM pin?

The THERM pin is an active-low open-drain output indicating that the overtemperature set point has been exceeded. It can also serve as an input; pulling it low forces the fan to full speed unless masked by user configuration.