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MAX1669 - Fan Controller and Remote Temperature Sensor with SMBus Serial Interface

General Description

The MAX1669 fan controller includes a precise digital thermometer that reports the temperature of a remote sensor.

typically a low-cost, easily mounted 2N3906 PNP type

replacing conventional thermistors or thermocouples.

Key Features

  • include general-purpose inputs/outputs (GPIOs) for fan presence detection and a thermostat output intended as a fan override signal in case the host system loses the ability to communicate. The internal ADC has a wide input voltage range and gives overrange readings when too large an input voltage is applied. Other error-checking includes temperature out-of-range indication and diode open/short faults. The MAX1669 is available in a space-saving 16-pin QSOP package that allows it to fit adjacent.

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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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19-1574; Rev 0; 1/00 Fan Controller and Remote Temperature Sensor with SMBus Serial Interface General Description The MAX1669 fan controller includes a precise digital thermometer that reports the temperature of a remote sensor. The remote sensor is a diode-connected transistor—typically a low-cost, easily mounted 2N3906 PNP type—replacing conventional thermistors or thermocouples. Remote accuracy is ±3°C for transistors from multiple manufacturers, with no calibration needed. The MAX1669 has an independent fan controller with a lowcurrent logic output requiring external power components to interface to a DC brushless fan.