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Legacy Personal Blogs CPLD Controlled Door Lock - Soldering the CPLD
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  • Author Author: oldmanraskers
  • Date Created: 24 May 2015 2:49 PM Date Created
  • Views 565 views
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  • Comments 4 comments
  • max
  • max_v_cpld
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CPLD Controlled Door Lock - Soldering the CPLD

oldmanraskers
oldmanraskers
24 May 2015

I am now in the process of redesigning the circuit to accommodate a larger pin pitch CPLD, since soldering the 100 pin package proved very difficult image and I trashed three of them - admittedly I was better each time but I still ripped up tracks, moved pads, etc. etc. So... back to the drawing board.

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Top Comments

  • johnbeetem
    johnbeetem over 9 years ago +1
    I would definitely look into SchmartBoard for a 100-pin TQFP: http://schmartboard.com/index.asp?page=products_qfp&id=68 However, see if you can get away with a Xilinx XC9536XL or XC9572XL in a 44-pin PLCC…
  • johnbeetem
    johnbeetem over 9 years ago

    I would definitely look into SchmartBoard for a 100-pin TQFP: http://schmartboard.com/index.asp?page=products_qfp&id=68

     

    However, see if you can get away with a Xilinx XC9536XL or XC9572XL in a 44-pin PLCC.  You can even socket those with 0.1" through-hole pins.

     

    Or find a cheap CPLD module that already has the CPLD soldered on and has 0.1" connectors you can adapt, or has room for prototyping the rest of your circuitry.

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  • clem57
    clem57 over 9 years ago in reply to oldmanraskers

    From what I see, liberal use of paste and heat with gun or oven until the paste separates. Solder should never be used on the BGA unless you have a rock solid hand (which I do not).

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  • oldmanraskers
    oldmanraskers over 9 years ago in reply to clem57

    image I did use solder paste and a heat gun... and soldering iron... I just kept getting bridges and in the end I snapped the legs etc.. I need to experiment some more I think.

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  • clem57
    clem57 over 9 years ago

    are you really soldier these? Look at Schmart boards or use soidler paste instead. Then use heat to reflow the paste.

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