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Original question:

TLV2548 SPI Timing

TLV2548M: SPI SCLK

siwon kim
Prodigy 110 points
Part Number: TLV2548M
Other Parts Discussed in Thread: TLV2548

Tool/software:

I have a question about SCLK on the TLV2548 SPI.
CFR = AF80
SCLK = 11MHz
Conversion clock Select = SCLK/2
Long Sampling
used as INT
In the above condition, SCLK does not work when 42ea is entered, and it is not operated when
28 + 14x2 = 56ea was input and it worked fine.

Is this setup correct?

  • 0
    TI__Expert 3910 points

    HI Siwon,

    The configuration register (CFR) is 12 bits wide, so would be represented by 3 hex digits. Right now, I'm assuming a value of 0xAF8. Is this your correct usage? If so, this does not line up to the configuration that you wish to use. 

    siwon kim said:

    In the above condition, SCLK does not work when 42ea is entered, and it is not operated when
    28 + 14x2 = 56ea was input and it worked fine.

    Can you expand on your reasoning for this so I can follow along better?

    Regards,
    Joel

  • +1 in reply to Joel Meraz
    Prodigy 110 points

    I asked the question too casually.

    It's a simple question.

    When I set Conversion Clock Select = SCLK
    I understand that 14ea SCLK is required for conversion.

    If I set Conversion Clock Select = SCLK/2, do I still need 14 ea SCLK or 28 ea?

    The reason for this question is that if I send SCLK 14ea, INT is not output, but if I send SCLK 28ea, INT and ADC DATA are output normally.

  • 0 in reply to siwon kim
    TI__Expert 3910 points

    Hi Siwon,

    Yes, I understand now. Thanks for clarifying. 

    In the case that Conversion Clock = SCLK/2, it will be 28 SCLKs, since 14 conversion clocks are required to complete a conversion. If Conversion Clock = SCLK/4, it would take 56 SCLKs. 

    Regards,
    Joel

  • +1 in reply to Joel Meraz
    Prodigy 110 points

    Thanks for the clarification.
    Your answer has solved my problem.