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  • TI Thinks Resolved

AMC6821: Application: FAN speed measurement (R.P.M) from 0x08 & 0x09 register

Expert 2225 points

Replies: 13

Views: 1597

Part Number: AMC6821

Hi there:

customer side would like to check the R.P.M reading of AMC6821 register whether match the real case FAN speed. 

But the reading from 0x08 & 0x09 was always 0xff, may we know the how to read the speed correctly?

and from the tool set of EVM,  we know could convert the RPM reading from register, but how is that work? 

( ) 

thanks again. 

  • Hi Kay,

    Thank you for your question. A TI representative will get back to you tomorrow, as today is a holiday.

    Thanks for your understanding,
    Ren
  • In reply to Ren Schackmann:

    Hi Kay,

    I'm currently looking into your request, and will update you with the information that I find.

    Best Regards,
    Matt
  • In reply to Matthew Sauceda:

    Hi Kay,

    How have you configured the configuration registers 1 and 2?

    Also, could you send me a schematic of the design?

    -Megan
  • In reply to Megan Anderson:

    Hi Megan:

    To attache the schematic of customer side , for the configuration register 1 & 2 would check with RD again. 

  • In reply to Kay Chen53:

    Hi Kay,

    Thanks for the schematic. We will review and get back to you once we finished acquiring feedback.

    Best Regards,
    Matt
  • In reply to Matthew Sauceda:

    Hi Matt:

    update register configuration information from customer side.

  • In reply to Kay Chen53:

    Hi Kay,

    Could you share the oscilloscope capture from the TACH pin output of the AMC6821?

    Also, can you share with me your TACH-Low-Limit, TACH-High-Limit, and TACH-SETTING registers?

    Best,
    Megan
  • In reply to Megan Anderson:

    Hi Megan:

    our customer side RD member is under collecting the information;

    BTW, could you help to share example waveform of TACH pin & registers  value for example?

    Perhaps we could also check it at the same time?

  • In reply to Kay Chen53:

    Kay,

    You will have to give me some time to test this on my bench and provide those waveforms.

    Thanks,
    Megan
  • In reply to Megan Anderson:

    Kay,

    Did the customer make any measurements?

    -Kelvin

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