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temperature controlled fan

Chris LaMothe1
Prodigy 40 points
Other Parts Discussed in Thread: AMC6821

All,

I've been looking at a couple designs for temperature controlling fans.  I'm hoping for something simple with very few components.  My question is around the stand-alone mode of the AMC6821.  Does anyone know if this can be used solely in stand alone mode?  It appears to need cpu connection for most of the functions.

Thanks

  • 0
    TI__Expert 6925 points

    Hello Chris,

    After power up, the AMC6821 isn’t actively controlling temperature. It is pre-configured for stand-alone temperature monitoring and control, but to activate the process, the START bit needs to be set:

    By default, after power up, it keeps the duty cycle at 33% (33% low and 66% high) for an external PMOS controlling the fan. Then, after the START bit is set to “1”, it starts monitoring the external temperature sensor, and if the temperature goes above 48°C, it controls temperature by increasing/decreasing the fan duty cycle linearly (6.3%/°C slope).

    If more functionality is preferred, typically, two registers are written to set the threshold temperature, slope (%/°C), and fan frequency.

    Regards,
    Rafael