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Master and daughter boards

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4 commentaires

  • Brad Levy

    I think the answer is yes, you can accomplish this, though there isn't necessarily a feature with tems like Master Board and Daughter Board. (I don't have the Pro version yet.)
    Essentially, there is nothing to preclude you from indicating slots or v-scoring (usually using a non-electrical annotation layer) where the master board and daughter board are adjacent. The boards can go through assembly as a unit, then you break them apart after assembly.


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  • Jennifer Smith

    HI Brad,

    I read that you can do panalisation in Pro but wasn't sure how to combine the two.  Would you do the daughter board as a block in the same schematic and then just have them as two separate boards in the PCB?

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  • Brad Levy

    I would treat the mother and daughter board(s) as a single PCB, and only use the panelization feature if placing multiple mother/daughter sets on the same panel for manufacturing purposes.

    Example 1:  Suppose you have the combined area of the motherboard and daughterboard(s) is 15 cm x 20 cm. That is large enough that it can be run through automated assembly equipment by itself (one "set" per panel). The board house might still panelize multiple copies for efficiency during manufacture of the bare board, but separate the copies before delivery or parts placement.

    Example 2: Suppose your motherboard+daughterboard(s) "set" is 3 cm x 14 cm. That is too small in one dimension to be handled individually by assembly equipment, so it would be panelized to make a board big enough to run through the automated assembly equipment. The panel in this case might have 6 copies of the design (motherboard + daughterboard sets), making a 18 cm x 14 cm panel.

    The single board set (example 1) or multi-set panel (example 2) are actually a little larger than I stated, because panels going through automated assembly have strips at the top and bottom edges for the conveying equipment to hold it by. These top and bottom strips also contain fiducial marks that the assembly equipment uses for alignment when placing parts on the board.

    If you are having the same company make the bare board and do the assembly, it frequently makes sense to leave the panelization of the sets (in the second example) to them, as they know what minimum and maximum board sizes their assembly equipment can handle, and what size is a good match for their equipment and workflow. If the panel is large it have more sag in the middle between the top and bottom rails, causing multiple problems unless external supports are added, taking extra steps. So largest does not always equal best panel size.

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  • Jennifer Smith

    Thanks Brad, that's really useful.  It won't be big enough to be option 1 so option 2 would be what I would do and I guess let SEEED do it as you suggest to prevent any errors.  

    So I would treat it as 1 PCB but separate the 1 x motherboard and up to 10 daughter boards with v cuts? 

    I'll look into how to do these as not done anything like this before. 

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