no of pin issue- smart card chip( 6 or 8 contacts) and microcontroller(40 pin)?

Discussion in 'Embedded Systems and Microcontrollers' started by rohitamitpathak@gmail.com, Nov 17, 2011.

  1. rohitamitpathak@gmail.com

    Thread Starter New Member

    Nov 17, 2011
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    0
    Good Evening to all,
    I am a student of computer science.. for last some some days i am stuck in something, In this time i am working over smart card technology, there i saw a chip, which is a kind of microcontroller { i attached a pic for this } . I read also about microcontroller 8051 because it is widely used, this microcontroller have 40 pins ...

    But
    the smart card chip only have 6 or 8 contacts or pins, so i am confused what about remaining pins present in microcontroller, Is chip contacts are the pin of microcontroller?
    People say that - In smart card only 5 pin (vcc, vpp, grnd, i/o,reset) are required that why other microcontroller pin omitted.
    please share your knowledge with me, and let me know if anything u want to ask

    Note- i attaced two pic, a microntroller or chip here.
     
  2. t06afre

    AAC Fanatic!

    May 11, 2009
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    You can get tiny micro-controllers with only 6 pins. It is no rule that say a microcontoller must have 40 pins. On a modern microcontroller the actuall chip inside the package is very small. I did not find any number. But it is very small. The package the chip is placed inside. Is more a carrier for the connection to the outside world, than the chip itself
     
  3. spinnaker

    AAC Fanatic!

    Oct 29, 2009
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    You can use the remain pins for whatever you want. You might want to add an LCD, buttons, sensors whatever you want.

    I am currently working on a temperature logger. It has a temperature sensor, SD memory, buttons and an LCD.
     
  4. rohitamitpathak@gmail.com

    Thread Starter New Member

    Nov 17, 2011
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    Thanks for your words!!!!!!
    You mean to say- Microcontroller pins are only a medium with help of that we can pass data { voltage, data, etc .....} in/out of microcontroller...
    It means i can say the picture which i pasted here- is a microcontroller of 8 pin...?
     
  5. rohitamitpathak@gmail.com

    Thread Starter New Member

    Nov 17, 2011
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    You means to say - number of pin is depend upon our requirement.... {8051 with 40 pin is a genaral structure, we can omit the pin according to our need. is this right?}
    if i add a led light then we have to add a additional pin. is this correct?
     
  6. spinnaker

    AAC Fanatic!

    Oct 29, 2009
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    You are correct. But with a 40 pin chip your should be able to do just about anything. Also you can control more LEDs than you have pins. Lookup Charlieplexing.
     
  7. Feign

    Active Member

    Mar 30, 2009
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    I didn't really pick out a question there from the OP.
    maybe this is meant to have a question mark.
    smart card reader = micro chip or ASIC (application specific integrated circuit)

    microcontroller implies a management or overseer role and such, where a Card reader performs a specific function.

    A smart card reader microchip might contain a microcontroller among it's hardware.
    And a micro controller chip, may have on board smart card functions. (this last bit maybe confusing)
     
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