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MAX1669

Maxim
Part Number MAX1669
Manufacturer Maxim
Description Fan Controller and Remote Temperature Sensor with SMBus Serial Interface
Published May 6, 2005
Detailed Description 19-1574; Rev 0; 1/00 Fan Controller and Remote Temperature Sensor with SMBus Serial Interface General Description The M...
Datasheet PDF File MAX1669 PDF File

MAX1669
MAX1669


Overview
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 to 160Hz) PWM mode intended for driving the fan motor, or a high-impedance DAC output that generates a variable DC control voltage.
In PWM mode, the FAN frequency can be synchronized to an external clock.
Other 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 to the SLOT1 connector.
PART Features o Measures Remote CPU Temperature o No Calibration Required o 20Hz to 160Hz PWM Output for Fan o PWM Frequency Sync Input (260kHz) o Flexible Fan Interface: Linear or PWM o SMBus 2-Wire Serial Interface o Programmable Under/Overtemperature Alarms o ALERT Latched Interrupt Output o OVERT Thermostat Output o Two GPIO Pins o Write-Once Configuration Protection o Supports SMBus Alert Response o ±3°C Temperature Accuracy (-40°C to +125°C, remote) o 3µA Standby Supply Current o +3V to +5.
5V Supply Range o Small 16-Pin QSOP Package MAX1...


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