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Schematic for OEM BS2-SX and OEM BS2-E — Parallax Forums

Schematic for OEM BS2-SX and OEM BS2-E

marzec309marzec309 Posts: 146
edited 2008-03-29 14:58 in BASIC Stamp
Please help, as i think i fried my BS2-SX. OK i spent about a week testing a proto board, that i built just to have the BS2-SX short it out upon insertion. The circuit is built exactly as the "BASIC Stamp 2sx Change Notice For Interpreter Chip Users" shows. What the "H""E" double hockey sticks is going on. Do I Have a bad chip?

Comments

  • Bruce BatesBruce Bates Posts: 3,045
    edited 2008-03-28 06:05
    marzec309 -

    It's most likely that the problem is with your proto board, and not with the Stamp. I've been on these forums since the BS-2SX was introduced, and I've never heard of any of them shorting out anything by themselves. The Stamp chips are rock solid, and always has been.

    Regards,

    Bruce Bates

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Involvement and committment can be best understood by looking at a plate of ham and eggs. The chicken was involved, but the pig was committed. ANON
  • marzec309marzec309 Posts: 146
    edited 2008-03-28 12:09
    Bruce Bates said...
    marzec309 -

    It's most likely that the problem is with your proto board, and not with the Stamp. I've been on these forums since the BS-2SX was introduced, and I've never heard of any of them shorting out anything by themselves. The Stamp chips are rock solid, and always has been.

    Regards,

    Bruce Bates

    I thought the same thing. I retraced every thing to do with the 5V supply and every thing is the way it should be. at least according to my documents. Also let me clarify this is an OEM project. Using the individual components not a module.

    This is the schematic I use to wire up my project as its the only one I could find. parallax.com/Portals/0/Downloads/docs/prod/schem/BASIC-Stamp-2sx-Change-Notice-For-Interpreter-Chip-Users.pdf
    Are these correct for the OEM BS2-SX interpiter chip. I am using the DIP package. I want to verify that this is the proper circuit before attempting to use another chip.
    pdf
    pdf
    BASIC-Stamp-2sx-Change-Notice-For-Interpreter-Chip-Users.pdf
    146K
  • ForrestForrest Posts: 1,341
    edited 2008-03-28 16:55
    I sure hope you didn't connect your SX28 (DIP package) according to the schematic that's linked in your message. That schematic shows the pinout for the SX28AC/SS-G (Surface Mount) which is very DIFFERENT than the DIP package. FYI pin 4 on the Surface mount chip is VDD, while on the DIP package pin 4 is VSS. Check the datasheet for the SX28 here - which includes pinouts for both the DIP and Surface Mount package www.parallax.com/Store/Microcontrollers/SXChips/tabid/138/ProductID/355/List/1/Default.aspx?SortField=ProductName,ProductName
  • marzec309marzec309 Posts: 146
    edited 2008-03-28 19:40
    Forrest said...
    I sure hope you didn't connect your SX28 (DIP package) according to the schematic that's linked in your message. That schematic shows the pinout for the SX28AC/SS-G (Surface Mount) which is very DIFFERENT than the DIP package. FYI pin 4 on the Surface mount chip is VDD, while on the DIP package pin 4 is VSS. Check the datasheet for the SX28 here - which includes pinouts for both the DIP and Surface Mount package www.parallax.com/Store/Microcontrollers/SXChips/tabid/138/ProductID/355/List/1/Default.aspx?SortField=ProductName,ProductName

    OK, well that explains it guess i need to contact parallax. Yes i did connect my chip to the circuit. well its probably junk now. Your link brings up a question if this is the same chip i have why did mine cost 12.95? when the one in your link was 2.79. whats up with that. well any ways, I'll change my circuit and see what happens. thanks
  • RobotWorkshopRobotWorkshop Posts: 2,307
    edited 2008-03-28 19:47
    The difference is that the chip your bought has the Parallax program for the BASIC Stamp Interpreter. That code is programmed into the chips flash by Parallax and is what makes the chip a BASIC stamp. The difference you pay is for the Interpreter.

    In regards to the datasheet it is for the SX28 processor chip itself. It doesn't have the Stamp Interpreter included. It is programmed in assembly code or with a special BASIC compiler called SX/B. It also requires a special programming adapter called the SX-Key or SX-Blitz to program the flash in the chip.

    If you have a large volume then you might want to get used to SX/B and try programming the SX chips directly as you can save some money on your project.
  • ForrestForrest Posts: 1,341
    edited 2008-03-28 23:19
    FYI the product page for the BS2SX OEM module has a schematic showing how the DIP version of the SX28 BS Interpreter should be connected www.parallax.com/Store/Microcontrollers/BASICStampOEM/tabid/135/CategoryID/10/List/0/SortField/0/catpageindex/2/Level/a/ProductID/501/Default.aspx
  • marzec309marzec309 Posts: 146
    edited 2008-03-29 14:58
    Forrest said...
    FYI the product page for the BS2SX OEM module has a schematic showing how the DIP version of the SX28 BS Interpreter should be connected www.parallax.com/Store/Microcontrollers/BASICStampOEM/tabid/135/CategoryID/10/List/0/SortField/0/catpageindex/2/Level/a/ProductID/501/Default.aspx

    Cool thanks just wish they would have included that on the Chips Page.
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