!!! The package of AT32uc3b0512 is not TQFP64...

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It wasted me £15 on PCB. On Eagle software, there are 2 packages: TQFP-64 and VQFP-64. When I checked the package of TQFP64, found it not TQFP but VQFP. Because of that, The PCB boards are no longer valid.

Hope Atmel will correct the description on the datasheet.

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Last Edited: Wed. Aug 30, 2017 - 12:47 PM
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MrAn wrote:
Hope Atmel will correct the description on the datasheet

Rather, a lesson that you must check that what your PCB tool calls "TQFP" matches the manufacturer's specification of the actual part you are using

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Tis a bitter lesson I've had a couple of times. Tqfp could be 0.8,0.65 or 0.5mm pitch. I got caught once with qfp being 0.65 or 0.5 - luckily the part came in both.

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SSOP too.  I corrected at least one FTDI FT230X layout that assumed SSOP-16 means 0.65mm pitch.  Apparenly 0.025 inches (0.635mm) is also a common "SSOP16" pitch.

 

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It is a really good lesson for me. This time I re-designed the PCB with checking hundreds of times on packaging... Hope this time all will be correct.

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If possible, i print out the pcb and check the actual part lines up.

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I always ensure that I have all parts on hand, print the top and bottom board layouts on paper and check alignment/placement with every single component and pad. I have yet to have a design fail after sending to a board house due to improper pad layouts.

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