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Related

What to do when a review doesn't go as planned

scottiebabe
scottiebabe over 3 years ago

I am currently having an issue reviewing the MAX77714 EVK where the 32k XO isn't running. Its not really a hardware issue as I can get the XO to run just with the capacitance of 2 10x scope probes. The issue has to do with configuring the PMIC to enable its on die load capacitors for the 32k oscillator.

 

I can't even try to enable the load capacitors because the evaluation software doesn't have the correct register map for the PMIC. The evaluation tool locates the 32KLOAD bitfield in register 0x31:

image

 

When actually the bitfield is in register 0x30 (from the datasheet: https://datasheets.maximintegrated.com/en/ds/MAX77714.pdf ):

image

 

Actually as I write this, even if the 32KLoad register was addressed correctly in the evaluation software it is readonly so I still wouldn't be able to change it. So why isn't it booting with a value of 0b00 instead of 0b10? Wrong OTP config?

 

So, my questions is what do reviewers typically do in this situation?I don't want to write a scathing review over something so silly.

 

I suppose I will start by seeing if maxim will confirm the issue with the EVK and see if they can provide a software fix or want to send new hardware.

 

One of the uncertainties I had with my last review was determining if I am reviewing the silicon product or the evaluation platform. In this case, am I reviewing the MAX77714 or the EVK and software for the MAX77714? Or, a bit a both? Or, is it up to the reviewer?

 

Thanks

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  • scottiebabe
    scottiebabe over 3 years ago in reply to dougw +1
    Yes, normally this is a good way to drown out a 32kHz oscillator, lol. The board designer did include not fitted load caps, so I can make the on board 32kHz XO function, just not what I was expecting from…
  • navadeepganeshu
    navadeepganeshu over 3 years ago +1
    I too see the same thing happening wherein the register values are incorrectly mapped against the capacitance value choices. But I am curious, why that value needs to be changed/configured? Seems like…
  • 14rhb
    14rhb over 3 years ago +1
    Like many other roadtesters and yourself, I too have run into issues with development boards before. Progress is very slow and each step seems to be a struggle - but keep trying. Use the manufacturer's…
  • Jan Cumps
    Jan Cumps over 3 years ago

    When I have a road test with issues, I usually log a ticket on the supplier's support system. I then write about the progress of that ticket in my review blogs - good and/or bad experience.

    if it goes really bad, I send  heads-up to the road test organisers - so that they can inform their contact at the supplier.

    edit: I add a link to the road test or my blog in the ticket, when I create one specific for that.

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  • dougw
    dougw over 3 years ago

    It is certainly frustrating when something like this stalls a review or causes a lot of time to be spent on something trivial.

    Manufacturer involvement would seem to be the only real solution here, as Jan points out.

    Interesting work-around though - running with scope probes attached...image (Does this mean you could kludge on physical caps?)

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  • jc2048
    jc2048 over 3 years ago

    image

     

    The datasheet says the setting can be changed through a test register for prototyping purposes. So it's possible that the software tool you're using is meant to be doing that behind the scenes, though it does rather look like they might have taken the tool for another part and not changed all the things that they should have done.

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  • scottiebabe
    scottiebabe over 3 years ago in reply to Jan Cumps

    Thanks Jan. I believe this is the path forward and I will see where it goes. I like your idea of writing a blog post, If I am going go to the trouble of documenting the issue, I might as well post it in a blog post as well.

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  • scottiebabe
    scottiebabe over 3 years ago in reply to jc2048

    Nice discovery in the datasheet! Hmm, I wonder where this test register is. Also interesting is they don't list the 32KLOAD_OTP value in the OTP table, so the load caps may be disabled by default in this OTP version (CID4=0x01).

     

    This is certainly not what I had expected to see, the 32k oscillator fail to start. Fortunately, there is an on die ~32kHz RC fail-safe oscillator. 

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  • scottiebabe
    scottiebabe over 3 years ago in reply to dougw

    Yes, normally this is a good way to drown out a 32kHz oscillator, lol. The board designer did include not fitted load caps, so I can make the on board 32kHz XO function, just not what I was expecting from a Maxim EVK...

     

    At this point I'm still not sure who made the mistake.

     

    There are also a number of silly unit typos in the datasheet (which does happens, just annoying to see):

     

    image

    image

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  • navadeepganeshu
    navadeepganeshu over 3 years ago

    I too see the same thing happening wherein the register values are incorrectly mapped against the capacitance value choices. But I am curious, why that value needs to be changed/configured? Seems like internally it's taking default capacitance value and clocks fine. Simply for testing purposes? Alright.

     

    Apart, there are minor bugs where the whole 'register explorer' tab GUI minimizes when the configuration tray is pulled down(i saw it happening twice. now, not finding where exactly was it,......murphy is real)

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  • scottiebabe
    scottiebabe over 3 years ago in reply to navadeepganeshu

    Don't let my experiences bias your review of the EVK. Its plausible your board is different from mine. I look forward to reading your review image.

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  • navadeepganeshu
    navadeepganeshu over 3 years ago in reply to scottiebabe

    Cool, alright. I wouldn't have figured that out otherwise.

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  • scottiebabe
    scottiebabe over 3 years ago in reply to navadeepganeshu

    No worries. Maxim missed it too!

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