a fiducial marker system using digital techniques

A fiducial marker system using digital techniques registration#

The fiducial marker placement is key and failing to do so meant all the QFP packaged MCUs with tiny pitches had to be manually assembled. Being accustomed to PLCC sockets, which are through hole components, it didn’t occur to me to provide fiducial markers on the PCB. When my PCB assembly suppliers dropped me an email stating that they were unable to machine assemble the MCU on the 200 production boards I ordered, my nightmare began. As far as I could tell, it was only a matter of time before chip manufacturers stopped producing MCU in PLCC packages in favor of QFP or similar packages. This is because PLCC requires an additional socket while QFP can be mounted on the PCB directly. When (Quad Flat Package) QFP packages of microcontrollers (MCU) became popular, I had no choice but to migrate from the old plastic leaded chip carrier (PLCC) footprint. When I started my electronics design career, through-hole components were extremely popular and surface mounted components were a rare sight. This is likely because I was getting my fair share of horror stories at work when simple mistakes resulted in catastrophic post-production nightmares. In my younger days I really enjoyed being scared silly, but when I started my engineering career I became more interested in action and sci-fi genres. 97–106.About 10 years ago, I stopped watching horror movies.

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A fiducial marker system using digital techniques registration#

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