MAX6664AEE+

Thermal Management Overview

The MAX6664AEE+ is an ACPI-compliant local and remote-junction temperature sensor and fan controller manufactured by Analog Devices Inc./Maxim Integrated. It measures its own die temperature and the temperature of a remote PN junction, controlling DC cooling fan speed based on these readings. The device features ±1°C accuracy for remote measurements between +60°C and +100°C, with a resolution of 0.125°C for both local and remote channels. It operates within a supply voltage range of +3V to +5.5V and supports a -40°C to +125°C operating temperature range. Communication is handled via a 2-Wire SMBus interface.

Thermal Management Feature Summary

• ACPI-compliant local and remote-junction temperature sensing with programmable alarms
• Automatic or manual PWM fan-speed control with tachometer monitoring and fault indicators
• SMBus 2-Wire serial interface with timeout protection and configurable slave address
• Programmable temperature offset for system calibration and controlled PWM rise/fall times

Thermal Management Applications

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

Thermal Management Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and temperature grade. Confirm availability status as distribution channels may report limited stock or discontinuation. Ensure compatibility with existing SMBus addressing configurations before integration. Cross-reference pinout requirements with the target PCB layout to ensure proper connection of pull-up resistors and power supply bypassing.

Thermal Management Selection Notes

Select this component when ACPI compliance and integrated fan control are required alongside precise thermal monitoring. The MAX6664AEE+ is suitable for systems needing remote diode measurement capabilities with high accuracy in critical temperature ranges. Consider the 16-pin QSOP package constraints and SMBus interface requirements during design. Evaluate if the automatic fan-control modes and watchdog features meet the system's reliability standards.

Thermal Management Part Context

The MAX6664AEE+ belongs to the MAX6653/MAX6663/MAX6664 family of temperature monitors and PWM fan controllers. These devices are designed for microprocessor-based systems requiring robust thermal management. The family shares similar functional blocks but may differ in specific output configurations or additional shutdown pins, such as those found in the MAX6653 variant.

Thermal Management Replacement Considerations

MAX6663AEE+

Thermal Management FAQ

How does the MAX6664AEE+ handle SMBus communication failures?

The device includes an SMBus timeout feature that prevents it from locking the bus, ensuring system reliability even if communication is interrupted.

What is the purpose of the THERM output pin?

The THERM pin is an active-low thermal-overload output that indicates when the overtemperature set point has been exceeded. It can also be pulled low externally to force the fan to full speed.

Can the MAX6664AEE+ monitor fan speed?

Yes, it includes a tachometer input (TACH/AIN) that allows for fan-speed monitoring and provides fault indicators if the fan speed falls outside programmed limits.