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SX18 & SX28 with the SX Tech Board — Parallax Forums

SX18 & SX28 with the SX Tech Board

Tony LeylandTony Leyland Posts: 71
edited 2005-01-04 23:46 in General Discussion
Hi,

I'm new·to the SX and I'm looking to order the SX Tech Tool Kit to be shipped to the UK.· Before I do I would
like to ask, does anybody know if the SX18 chip fits this board like the SX28 does (same DIP socket) ?
This details for the chip,·shown on this site, seem to suggest it does.

Many thanks in advance
Tony

Comments

  • Jon WilliamsJon Williams Posts: 6,491
    edited 2005-01-04 17:09
    No, you can't put an SX18 into an SX28 socket; the pinouts are not compatible.

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    Jon Williams
    Applications Engineer, Parallax
    Dallas, TX· USA
  • allanlane5allanlane5 Posts: 3,815
    edited 2005-01-04 17:13
    Ok, so how are we expected to program an SX18?
    (like is used in the line-follower board)
  • NateNate Posts: 154
    edited 2005-01-04 17:47
    Tony,

    It is not difficult.· The SX key comes with a good data book that has a schematic for the SX-Tech board.· It is pretty simple to adapt this schematic to the pin-out of the SX-18 using a protoboard, IC regulated power supply (w/ capacitor), 10K ohm pull-up resistor (for the reset circuit) and a couple of jumper wires.· Takes about 8 minutes and will cost you about $7.

    Nate
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-01-04 17:47
    Allan,

    ·· I would imagine it shouldn't be too difficult to design a small adapter board to plug into the SX Tech Board socket which will route the appropriate pins to those on the SX18.· Had I a need for it now, I would probably design my own...Who knows, maybe I still will anyway.· If I draw one up on ExpressPCB, I will make the file freely available.· If not, anyone else up to it?



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    Chris Savage

    Knight Designs
    324 West Main Street
    P.O. Box 97
    Montour Falls, NY 14865
    (607) 535-6777

    Business Page:·· http://www.knightdesigns.com
    Personal Page:··· http://www.lightlink.com/dream/chris
    Designs Page:··· http://www.lightlink.com/dream/designs
    ·
  • Jon WilliamsJon Williams Posts: 6,491
    edited 2005-01-04 17:49
    The SLF board has a programming connection and socketed resonator so that you can modify to your heart's desire (and that project uses an SX28... it's the "standard" and advance builders will use the free IO pins for extra control -- like I did with the serial LCD example in the SX/B help file).

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    Jon Williams
    Applications Engineer, Parallax
    Dallas, TX· USA
  • Paul BakerPaul Baker Posts: 6,351
    edited 2005-01-04 18:39
    buy a 28 pin dip socket, and a 22 pin dip socket. Using standard pin notation (starting upper left corner and moving counterclockwize ie 8 pin dip:

    ··· chip notch is V

    1·-|----V
    |- 8
    2·-|··········|- 7
    3·-|··········|- 6
    4·-|
    |- 5

    Cut off pins 3, 5, and 18-25·of the 28 pin dip socket.
    Cut off pins 3-6, 13 and 14 of the 22 pin dip socket leave enough metal to solder to but not make contact when popping the 22 pin socket in the 28 pin socket.

    Plug 22 pin socket in 28 pin socket with bottom of the two·sockets flush (pin 11 of 22 pin socket·into pin 14 of 28 pin socket).

    Solder the following jumpers, the first number is 28 pin socket push the jumper wire into the socket hole (solid wire works best), then solder wire·to the underside of the 22 pin socket pin given as the second number:

    1· -> 4
    2· -> 17
    4· -> 6
    6· -> 20
    7· -> 21
    8· -> 2
    9· -> 3
    14-> 13
    15-> 14
    16-> 15
    17-> 16
    26-> 18
    27-> 19
    28-> 8

    plug the two sockets into the tech board,·continuity test·all connections (but not the four corner holes, the extra 4 holes are for stability of the two dip sockets when mated)·with thier correponding breadboard connection·to make sure they are properly mapped (use figure 1.1 of SX user guide as reference).

    plug your SX18 into the 22 pin socket leaving the four corner holes unused. now·the tech board pins are mapped to an SX18 and you should be able to program and debug your SX18.

    Paul

    I can draw a figure later if you are confused
  • BeanBean Posts: 8,129
    edited 2005-01-04 18:44
    Don't forget that the SX18 is a discontinued product...
    Bean.
  • Jon WilliamsJon Williams Posts: 6,491
    edited 2005-01-04 19:30
    ... but we still have about 1500 of them in our stock. Good for experimenting, but not long-term planning (use the SX20).

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    Jon Williams
    Applications Engineer, Parallax
    Dallas, TX· USA
  • Tracy AllenTracy Allen Posts: 6,667
    edited 2005-01-04 20:01
    Jon,

    I think those must all be the DIP-18 package. I ask because I'd like to get ahold of about 36 of the SX18AC/SO in the surface mount package., to stuff into some existing boards. I think I cleaned out the Parallax stock of those. If anyone has some they don't need, please contact me off list.

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    Tracy Allen
    www.emesystems.com
  • Jon WilliamsJon Williams Posts: 6,491
    edited 2005-01-04 23:46
    Yes, they are DIPs -- sorry I didn't specify that earlier.

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    Jon Williams
    Applications Engineer, Parallax
    Dallas, TX· USA
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