MAX6641AUB96+

Thermal Management Overview

The MAX6641AUB96+ is an SMBus-compatible temperature monitor and automatic PWM fan-speed controller in a 10-pin µMAX package. It measures local die temperature (0°C to +125°C) and remote pn junction temperature (0°C to +255°C). The device operates on a 3.0V to 5.5V supply, consuming typically 500µA. It features an open-drain over-temperature alarm output and a programmable PWM output for fan control. The specific ordering suffix '96' assigns the SMBus slave address 011x.

Thermal Management Feature Summary

• SMBus digital interface with four selectable slave addresses
• Automatic PWM fan-speed control with spin-up capability
• Open-drain over-temperature alarm output for system protection
• Remote diode input for accurate thermal monitoring

Thermal Management Applications

• Desktop computers
• Notebook computers
• Servers
• Networking equipment

Thermal Management Procurement Notes

Verify the component matches the exact part number MAX6641AUB96+. Confirm the manufacturer is Analog Devices Inc./Maxim Integrated. Ensure the package type is 10-pin µMAX. Check for RoHS compliance status if required by project specifications.

Thermal Management Selection Notes

Select this component when SMBus communication is required for thermal management. It is suitable for systems needing integrated fan control and over-temperature alarms. Consider the 10-pin µMAX package size for space-constrained designs. Verify that the operating voltage range of 3.0V to 5.5V aligns with the system power rails.

Thermal Management Part Context

The MAX6641 belongs to the Maxim Integrated thermal management family. It integrates temperature sensing and fan control functions into a single chip. The device simplifies system design by reducing the need for external components. It is designed for reliable operation in various computing and networking environments.

Thermal Management Replacement Considerations

The MAX6641AUB90+, MAX6641AUB92+, and MAX6641AUB94+ are functional substitutes within the same package. They differ only in their assigned SMBus slave addresses. Ensure the replacement part's address does not conflict with existing devices on the bus.

Thermal Management FAQ

What is the function of the OT pin?

The OT pin is an active-low, open-drain over-temperature output. It can be used to generate interrupts, throttle signals, or shutdown signals when temperature thresholds are exceeded.

How is the remote temperature measured?

The device measures the temperature of a remote pn junction, typically the emitter-base junction of a common-collector PNP transistor on a CPU, FPGA, or ASIC, connected via the DXP and DXN pins.

What is the purpose of the spin-up feature?

The spin-up feature forces the PWMOUT signal high for 2 seconds to ensure the cooling fan starts turning from a motionless state before settling to the predetermined duty cycle.