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MaaXBoard OSM93 and location of J15 2 pin connector

WilliamEllis

Hi,

The "MaaXBoard OSM93 Development Kit Hardware User Guide" (version 1.0) describes "RTC External Battery Power" as being connected via (verbatim):

  • The coin cell holder does NOT come pre-populated on board and will need to be installed by the user. Part number of XXXX (Link?) should be used
  • A connector with PN / LINK? should be used to interface with J15 2pin connector.

Can anyone advise where the J15 2 pin is? Like, physically, on the board, where is it?! (I can't see it cited anywhere else)

Can anyone advise what the template text "XXXX (Link?)" and "PN / LINK?" is meant to convey? Is there a newer version of this document, perhaps, which has these details?

Bill

  • We notice that "MaaXBoard+OSM93+User+Guide+v1.0.pdf" has this:

    image

    While "FY25_1574_Tria_MaaXBoard_OSM93_Product_Brief-3_vp.pdf" has the below. Note the difference in the highlighted detail in the red box!

    It seems like the board layout has changed/evolved at some stage? Perhaps that changed detail (+ / -)  relates to J15?

    image

    Does anyone have clarity on revisions of the OSM93?

    If we were to buy one of these -- would we get the layout on the top ; or the layout on the bottom?

  • in reply to WilliamEllis

    Hi,

    Can you please clarify the information you need, so I can try to assist.

    Thank you,

    Best regards.

  • in reply to WilliamEllis

    Bill,

    The production version MaaXBoard OSM93 has the black soldermask as shown in the 2nd photo that you posted.

    Regarding RTC_PWR :
    The production version PCB, provides footprints for three different RTC battery-backup options:

    1) BAT1: CR1220 button battery-holder (not fitted)

    2) C133 : ML414H rechargeable battery footprint (not fitted) 

    3) J15   : 1.25mm pitch, 2-pin header (not fitted)

    image

    These three options can be seen on the marked-up photo of the back of the board shown below

    (BAT1 silkscreen text is misleading, as it is positioned next to the two holes of J15, but battery polarity of all of these footprints is clearly marked) 

    image

    J15 is not labled on the silkscreen, but is indeed the 2-pin header footprint that you queried:

    image
    Regards
    -Peter

  • in reply to peterfenn

    Hi, many thanks, this does help clarify! I guess a few details changed between "green" (dev) and "black" (production).

    I would be interested in providing RTC power. Is there a standard / easy / cabling / pin / solution for that? (The reference manual advises, literally "XXXX"!).

    The J15 looks promising - but what would connect in those little gold holes? I would very much prefer a non-soldering solution.