Rainbow-electronics MAX6651 User Manual Page 1

General DescriptionThe MAX6650/MAX6651 fan controllers use anSMBus™/I2C™-compatible interface to regulate and mon-itor the speed of 5VDC/12VDC brushle

across the fan until the desired speed is reached. Open-loop operation allows the µC to regulate fan speed direct-ly. The µC reads the fan speed from

Alarm Status Register if the condition that caused thealarm is removed.TachometerThe Tachometer Count Registers record the number ofpulses on the corr

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behavior, a POR voltage detector monitors VCCandclears the memory if VCCfalls below 1.6V. When poweris first applied and VCCrises above 1.6V, the logi

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Temperature Monitoring and Fan ControlThe circuit shown in Figure 10 provides complete tem-perature monitoring and fan control. The MAX1617A (aremote/

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up to four fans, ensuring any significant speed mis-matches can be detected.For parallel fan control while monitoring up to four fanspeeds, select the

MAX6650/MAX6651Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface__________________________________________________________________

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MAX6650/MAX6651The MAX6650/MAX6651 use an 8-bit counter to countthe tachometer pulses. This means the device cancount from 0 to 255 tachometer pulses

Setting Up AlarmsThe MAX6650/MAX6651 can be configured to generatean ALERT output on GPIO0 whenever certain events,such as control loop out of regulat

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MAX6650/MAX6651Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible InterfaceMaxim cannot assume responsibility for use of any circuitry other

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