MAX6641AUB90+

The MAX6641AUB90+ is a SMBus-compatible temperature monitor with automatic PWM fan-speed controller in 10 pin µMAX package. This temperature sensor and fan controller accurately measures temperature of its own die and temperature of a remote pn junction. This device reports temperature values in digital form using a 2-wire serial interface. The remote pn junction is typically the emitter-base junction of a common-collector pnp on a CPU, FPGA or ASIC. The 2-wire serial interface accepts standard System Management Bus (SMBus) write byte, read byte, send byte and receive byte commands to read the temperature data and program the alarm thresholds. The temperature data controls a PWM output signal to adjust the speed of a cooling fan, thereby minimizing noise when the system is running cool, but providing maximum cooling when power dissipation increases. It is used in desktop computers, notebook computers, workstations, networking equipment and servers.

• Supply voltage range is 3V to 5.5V
• Operating temperature range from -40°C to 125°C
• Thermal diode input, local temperature sensor
• Open drain PWM output for fan drive
• Programmable fan control characteristics
• Automatic fan spin-up ensures fan start
• ±1°C remote temperature accuracy (+60°C to +145°C)
• Controlled rate of change ensures unobtrusive fan-speed adjustments
• Temperature monitoring begins at power-on for fail safe system protection
• OT (complementary) output for throttling or shutdown

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Sensing & Instrumentation, Portable Devices

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Market demand for this product has caused an extension in leadtimes. Delivery dates may fluctuate. Product exempt from discounts.

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