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Last Post 02 Dec 2015 04:37 PM by  anthony.zuliani@metrixvibration.com
Updates for eXperimenter board design files
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anthony.zuliani@metrixvibration.com
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01 Dec 2015 08:16 PM

    In the "Hardware Design Files" section of the AM3517 SOM-M2 (eXperimenter Kit) Downloads page, the latest set of AM3517 eXperimenter Kit Hardware Design Files (from 12/12/2011) contains a schematic for board 1014699 rev A.

    Are there hardware design files for board 1014698 rev A and B? The eXperimenter board I've been using for the past 5 years is 1014698 rev A, with an assembly part number of 1015188 rev B on the front. We purchased another eXperimenter kit earlier this year, and the board inside that kit is a 1014698 rev B.

    We're having difficulties reading from an SD card plugged into the 1014698 rev B board, and are looking for the schematics to troubleshoot the problem.

     

    Thanks,

    Tony Zuliani

    Adam Ford
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    Posts:756


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    02 Dec 2015 07:24 AM
    1014698 is the raw board and the corresponding schematic is 1014699 which does not appear to have changed. I can see in our system that we have two different board layout files for the Rev A and Rev B of the 1014698 board, but no corresponding changes to the schematic.

    I looked through the PCN notice here: https://support.logicpd.com/Desktop...ntryId=943 and from what I can tell the changes to the kits were mostly due to SOM changes.

    I'm going to continue to look into this further, but I would suggest swapping SOMs and see if the problem follows the SOM or the baseboard. Either way, something seems strange, because I wouldn't expect you to have issues with the SD card if you're using our stock kits, cards and software.

    If you want to download the older files, there is a symbol that looks like '>' next to the date on the link for the files. If you click that, it will expand down to show the older versions as well. I am going to ask one of the guys here who managed that to see if he can help me identify what has changed.

    If you have issues with the links, the direct links are as follows (from oldest to newest):

    https://support.logicpd.com/Desktop...tryId=1027
    https://support.logicpd.com/Desktop...tryId=1028
    https://support.logicpd.com/Desktop...tryId=1029


    I'll let you know what I find. If the problem persists, you may have to get an RMA through the distributor that sold you the baseboard.

    adam

    Adam Ford
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    Posts:756


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    02 Dec 2015 08:03 AM
    Can you also share with me the assembly part numbers between the two kits? It should be on the sticker near the serial port. You referenced one being 1015188, Rev B. Can you tell me what the other is?

    adam
    anthony.zuliani@metrixvibration.com
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    02 Dec 2015 01:28 PM
    Adam,

    Thanks for the info about the schematic number.

    Before I do some more tests between the two eXperimenter kits, here's the info you requested. The newer assembly showing the boot problem is 1015188 rev C; serial number on that label is 1612M01236 (manufactured in 16th week of 2012, I assume).

    Tony
    Adam Ford
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    Posts:756


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    02 Dec 2015 01:52 PM
    I talked with one of the OEM Product managers here and both agreed that you should probably RMA the kit that doesn't work to the distributor where you purchased it.

    He looked over the differences between the rev A and B versions of the 1014698 baseboard PCB and found that there is no circuit or layout differences between these two revisions. The transition from rev A to B was to update the solder mask layer on the bottom side of the board. We changed the test point openings in the solder mask from 10 mils to 20 mils in order to improve the ICT test probe contact area. No other changes were made to the PCB. These two board revisions are identical from a circuit operation standpoint.

    In your post, you mentioned two different baseboard revisions – 1015188 rev B and rev C. This revision change at the baseboard BOM level also had no impact on the circuit operation. This B to C BOM revision was simply to update the Logic PD assigned part numbers (e.g. removed some prefixes) on a few of the components on the board. This change did not impact the vendor part numbers used on these components.

    From everything we can see in this customer’s list of part number revision differences, there is no technical difference between the “old” and “newer” kits that you are using.

    I hope this helps.

    adam
    anthony.zuliani@metrixvibration.com
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    02 Dec 2015 04:37 PM
    Adam,

    Thanks for confirming that the two boards are the same from a circuit operation standpoint.

    I confirmed that a functioning SOM module and working SD card work correctly in our older eXperimenter board, yet the newer eXperimenter board fails to boot from the SD card that I know works.

    I'll begin the RMA process with the distributor.

    Thanks for the help on this issue,
    Tony
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