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MAX6660 - Remote Junction Temperature Controlled Fan Speed Regulator

General Description

The MAX6660 is a remote temperature sensor and fanspeed regulator that provides a complete fan-control solution.

Key Features

  • o Integrated Thermal Sensing and Fan-Regulation Solution o Programmable Fan Threshold Temperature o Programmable Temperature Range for Full-Scale Fan Speed o Accurate Closed-Loop Fan-Speed Regulation o On-Chip Power Device Drives Fans Rated Up to 250mA o Programmable Under/Overtemperature Alarms o SMBus 2-Wire Serial Interface with Timeout (Cannot “Lock Up” the SMBus) o Supports SMBus Alert Response o ACPI Compatible, Including OVERT System Shutdown Function o ±1°C (+60°C to +100°C) Thermal-Sens.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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19-2225; Rev 0; 10/01 Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface General Description The MAX6660 is a remote temperature sensor and fanspeed regulator that provides a complete fan-control solution. The remote temperature sensor is typically a common-collector PNP, such as a substrate PNP of a microprocessor, or a diode-connected transistor, typically a low-cost, easily mounted 2N3904 NPN type or 2N3906 PNP type. The device also incorporates a closed-loop fan controller that regulates fan speed with tachometer feedback. The MAX6660 compares temperature data to a fan threshold temperature and gain setting, both programmed over the SMBus™ by the user. The result is automatic fan control that is proportional to the remotejunction temperature.