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Prop Chip Photo — Parallax Forums

Prop Chip Photo

HumanoidoHumanoido Posts: 5,770
edited 2011-08-08 01:03 in Propeller 1
Can anyone post a photo or a link to a photo showing the back side of the smallest Propeller chip (44-Pin QFN Chip)? The photos I've seen only show the front side and there's nothing to see on the front side. Thanks!
P8X32A-M44-M.jpg
There's nothing to see on the front side of the
Parallax Propeller QFN chip. What does the back
side look like?

http://www.parallax.com/Store/Microcontrollers/PropellerChips/tabid/142/CategoryID/18/List/0/SortField/0/Level/a/ProductID/333/Default.aspx

The P8X32A-M44 is most useful for prototyping in its 44-pin QFN package. Connecting the Propeller module to your computer's serial or USB port using our Prop Plug for programming is quite simple. The Propeller chip can run on its own with a power supply, internal clock and using RAM for code storage. Add an external EEPROM for non-volatile code storage.

Comments

  • LeonLeon Posts: 7,620
    edited 2011-08-06 05:05
    There isn't much to see, just the usual QFN metal pad.
  • HumanoidoHumanoido Posts: 5,770
    edited 2011-08-06 07:21
    Leon wrote: »
    There isn't much to see, just the usual QFN metal pad.
    I've never seen one. So it could be a mind shaping experience to see it for the first time. If you have a prop qfn, it's show & tell time.
  • LeonLeon Posts: 7,620
    edited 2011-08-06 07:56
    I've got two of them, and took a photo for you.

    They are supposed to be attached with solder paste applied to the PCB with a stencil and reflow soldering. I've managed similar QFN devices with my Metcal soldering station with a large via for the central pad, feeding solder into it with a large tip cartridge.
    QFN.jpg
    368 x 257 - 6K
  • Mark_TMark_T Posts: 1,981
    edited 2011-08-07 13:52
    Unsurprisingly Google image search found one:
    http://zone-8.com/icm/product_info.php?cPath=&products_id=7983&osCsid=6aa7a9b878daf0ec5704471905f4e43b
  • HumanoidoHumanoido Posts: 5,770
    edited 2011-08-07 22:59
    Leon wrote: »
    I've got two of them, and took a photo for you. They are supposed to be attached with solder paste applied to the PCB with a stencil and reflow soldering. I've managed similar QFN devices with my Metcal soldering station with a large via for the central pad, feeding solder into it with a large tip cartridge.
    Leon, thanks for taking these photos. What is a large "via?"
  • HumanoidoHumanoido Posts: 5,770
    edited 2011-08-07 23:04
    Mark_T wrote: »
    Unsurprisingly Google image search found one:
    http://zone-8.com/icm/product_info.php?cPath=&products_id=7983&osCsid=6aa7a9b878daf0ec5704471905f4e43b

    Mark_T:

    Thanks for the link. I did first try a Google image search but not surprising the image didn't show up. For some reason it was blocked in China. But this direct link gives people living in China the opportunity to unblock it.
  • LeonLeon Posts: 7,620
    edited 2011-08-08 01:03
    Humanoido wrote: »
    Leon, thanks for taking these photos. What is a large "via?"

    Just a large plated hole.
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