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The desired fan speeds (or PWM duty cycles) are written through the I2C interface. The outputs drive "4-wire" fans directly, or can be used to modulate the fan's power terminals using an external pass transistor.”h]”hX0The MAX31790 controls the speeds of up to six fans using six independent PWM outputs. The desired fan speeds (or PWM duty cycles) are written through the I2C interface. The outputs drive “4-wire†fans directly, or can be used to modulate the fan’s power terminals using an external pass transistor.”…””}”(hjvhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KhjWhžhubh¸)”}”(hX Tachometer inputs monitor fan tachometer logic outputs for precise (+/-1%) monitoring and control of fan RPM as well as detection of fan failure. Six pins are dedicated tachometer inputs. 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