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EEVblog #716 - Raspberry Pi 2 Xenon Flash Problem Explained The physics behind the problem with a Xenon photoflash reset on the RPi2, and any other electronics component.

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Dave Jones

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15,379 views • 3 months ago •via X (Twitter)

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Raspberry Pi 2 Xenon flaş ışığına maruz kaldığında aniden kapanmakta veya kendini yeniden başlatmaktadır. Dipnot: İlgili bileşenin iç devre şeması halka açık olmadığından bu akımların tam olarak hangi noktayı etkilediği kesinleşmemiştir. Ancak topluluk ve mühendislik analizleri oluşan parazitik akımların çipin en hassas noktaları olan analog referans devrelerini veya feedback loop bozduğunu; bunun sonucunda voltaj regülatörünün kararsızlaşarak işlemciyi resetlediğini öngörmektedir. EEVblog adlı YouTube kanalının "Raspberry Pi 2 Xenon Flash Problem Explained" başlıklı videosundan almış olduğum notlar: Şubat 2015'te piyasaya sürülen Raspberry Pi 2 Model B kartlarında U16 bileşeni maliyeti ve alanı azaltmak için WL-CSP teknolojisiyle üretilmiştir. Yüksek yoğunluklu fotonlar yani flaş ışığı yarı iletken silikon üzerine düştüğünde fotoelektrik etki ile electron-hole çiftleri oluşturmaktadır. Bu sebeple çipin içindeki hassas analog referans devrelerinde / bandgap reference veya feedback loop'ta parazitik akımlar yaratır. Sonuç olarak regülatör kararsızlaşır, voltaj düşer ve işlemci kendini korumaya alarak reset atar. Kısacası sorunun kaynağı kart üzerindeki U16 kodlu voltaj regülatörünün maliyet ve alan optimizasyonu amacıyla WL-CSP teknolojisi ile paketlenmesidir. Bu paketleme türünde silikon yonga fiziksel olarak çıplak kaldığından Xenon flaş gibi yüksek yoğunluklu ışık kaynakları silikon yüzeyinde fotoelektrik etkiyi tetiklemektedir.
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