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Fan did not spin immediately by Fan IC amc6821

Robbert Lo
Prodigy 20 points
Other Parts Discussed in Thread: AMC6821

Hi all,

I use Fan IC amc6821 to control my PWM fan.

I use software DCY mode.

My question is:

When the fan stops, it will need to take about 5 seconds to start spinning after I send PWM to it.

Can I make the fan spin immediately?

Is there any configurations of amc6821 register to improve it?

Thanks if any suggestions.

 

Ryan

  • 0
    TI__Mastermind 27780 points
    Hi Robbert,
    Thanks for posting your question to E2E. The appropriate engineer will respond accordingly after reviewing your question.

    My immediate thought is to check the Fan Spin-Up configuration. How do you have your [STIME2:STIME0] bits configured? I would recommend setting these bits to '000' for the shortest spin-up time of 0.2s (ensure FSPD is also enabled). Does the fan still take 5 seconds or less to start spinning from a stopped condition? Check page 24 of the datasheet that discusses the spin-up process.
  • 0 in reply to Akeem Whitehead
    Prodigy 20 points

    Hi Akeem,

    I set [STIME2:STIME0] to 000. The 0x20 register is 0x18.

    The fan still needs to take about 5 seconds to start spinning from a stopped condition. 

    I have checked the PWM was ready immediately, but the fan didn't start to spin at the same time.

    I have changed other fans to test, but the result was the same.   

    Is there any things I need to check?

    Thanks if any suggestion.

     

  • 0 in reply to Robbert Lo
    TI__Mastermind 23810 points

    Robbert,

    Are you using the EVM? Can you export the register settings from the GUI so that I can try those settings with our set-up?

    Thanks,

    -Clancy