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Propeller 1 in an 18 pin DIP — Parallax Forums

Propeller 1 in an 18 pin DIP

TubularTubular Posts: 4,703
edited 2014-03-08 13:20 in Propeller 1
Following on from packing the prop 1 core into an "8 pin package", this is a design for getting it into a 18 pin pack.

It has the passives for VGA and TV onboard, with resultant dac output pins across the top edge.

I'm going to try Samtec male headers that have a "dog leg" in them to bring the spacing back from around .4" to .3". We'll see how that goes.


P1DIP18.png
P1DIP18.png
620 x 465 - 56K

Comments

  • jmgjmg Posts: 15,173
    edited 2014-03-07 22:50
    Tubular wrote: »
    I'm going to try Samtec male headers that have a "dog leg" in them to bring the spacing back from around .4" to .3". We'll see how that goes.

    Looks good.

    For ZIF programming adapter designs, I've used standard 0.1" pin strips, formed and plugged into a standard DIP socket.
    On some, we used pins with longer tails, but still 'common'.

    In another case, we used a mix of thru-holes and 'single sided ovals' near the PCB centre.
    In your case inner 6 may be able to be single-sided, and the other 12 all thru, on 0.3" centres ?
  • __red____red__ Posts: 470
    edited 2014-03-08 04:29
    Oh, the crystals I've been using is massive. Any chance of a part number for that crystal which appears to be in a resonator package?

    Thanks.
  • Cluso99Cluso99 Posts: 18,069
    edited 2014-03-08 04:42
    The xtal info is on the 8pin thread. IIRC its 5x3.2mm. There are also 2x3.2mm smt xtals I found at Digikey.
  • TubularTubular Posts: 4,703
    edited 2014-03-08 13:18
    jmg wrote: »
    Looks good.

    For ZIF programming adapter designs, I've used standard 0.1" pin strips, formed and plugged into a standard DIP socket.
    On some, we used pins with longer tails, but still 'common'.

    In another case, we used a mix of thru-holes and 'single sided ovals' near the PCB centre.
    In your case inner 6 may be able to be single-sided, and the other 12 all thru, on 0.3" centres ?

    Yes that "mixed" idea is interesting. Could keep it nice and narrow. However for this design bringing in the through holes in the corners would affect the number of passives that would fit

    For this board we've got circles and through holes so will be able to play with a few mixed technology options. I have to admit I'm a whole lot more comfortable with the through hole but I guess it depends a bit on how many insertions / removals it has to survive.
  • TubularTubular Posts: 4,703
    edited 2014-03-08 13:20
    __red__ wrote: »
    Oh, the crystals I've been using is massive. Any chance of a part number for that crystal which appears to be in a resonator package?

    Thanks.

    Red, it's a fox924 oscillator that jmg suggested might be useful with P2

    There are also crystals available in the same footprint but you'd need to check the specs as to whether they are suitable.

    Some forumistas have also had success with "watch" shaped crystals (small cylindrical can with both leads out one end)
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