Other error-checking includes temperature out-of-range indication and diode open/short faults. The internal ADC has a wide input voltage range and gives overrange readings when too large an input voltage is applied. 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. In PWM mode, the FAN frequency can be synchronized to an external clock. 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. The MAX1669 has an independent fan controller with a low-current logic output requiring external power components to interface to a DC brushless fan. Remote accuracy is ☓☌ for transistors from multiple manufacturers, with no calibration needed. The remote sensor is a diode-connected transistor-typically a low-cost, easily mounted 2N3906 PNP type-replacing conventional thermistors or thermocouples. The MAX1669 fan controller includes a precise digital thermometer that reports the temperature of a remote sensor.
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