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.
The fan controller has two modes of operation: a low-frequency (20Hz...