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LMX2592: Forcing power down via R36 via TICPro GUI

BrandonAzbell
Guru 64540 points
Part Number: LMX2592


On R36, the last 7 bits for ‘CHDIV_SEG_SEL’ and ‘CHDIV_SEG3’ I want to be all zeros for PD (Power Down, per below) but I can’t find a way to force it with the TICPro GUI.  How is this done?

 

  • 0
    TI__Mastermind 28021 points
    Brandon,
    Bit R35[8] is shown on our TICSPro GUI as CHDIV_SEG3_EN. So to disable segment 3, just set this to 0.
    This is how we program these segments off. I haven't tinkered by changing the divide value.

    Regards,
    Dean
  • 0 in reply to Dean Banerjee
    Prodigy 10 points

    Is the datasheet in error where for R36 it shows bits 6 thru 0 as 'PD=0' for power down?

    Thanks,

    Tom

  • 0 in reply to Thomas Moran74
    TI__Mastermind 28021 points

    Tom,

    I would consider the datasheet misleading, and possibly wrong.  Regardless, the simplest and most robust thing to do is set CHDIV_SEG3_EN (not CHDIV_SEG) to power down segment 3.    Setting CHDIV_SEG3_EN(R35[8]) = 0, then this is what TICSPro does and this is how we have characterized the part.  So this is the most confident method.  I know that it will power down segment 3 and any unused muxing circuitry.

    Now the datasheet does say that CHDIV_SEG3{R36[3:0]) = 0 is the powerdown state, but I have less confidence.  Not only is this not the way we do it in our software and how we characterized this, but I'm not sure if it powers down unused muxing circuitry.

    Maybe both methods are equivalent, ir maybe not;  I don't know.  In my opinion, I would rather the datasheet just say CHDIV_SEG3=0 is an invalid state to prevent confusion as to which method to use to power down the unused segments.

    Regards,
    Dean

  • 0 in reply to Dean Banerjee
    TI__Mastermind 28021 points
    Hi all,

    I got an email saying this answer was rejected, but no reasoning why.

    Regards,
    Dean