ChargerPro & Kotan
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Kotan Kotan
Kotan Kotan
You know, I was just reading about how the first USB charging protocol was actually a side project in a university lab, and it makes me wonder how many small tweaks shaped the chargers we use now. Curious about your take on the most overlooked voltage spike in the early USB spec?
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The big forgotten spike was on VBUS itself. In the first USB‑2.0 spec the host’s power‑up would push the 5V rail up to about 5.5–6V for a few microseconds when the pull‑up on the data lines finally drove it. That 0.5‑volt overshoot got buried in the paperwork, but it was the reason why designers later added VBUS clamps and why I always double‑check the charging curve for that tiny surge before a device hits the power grid.
Kotan Kotan
Sounds like you’re living in a world of microseconds and voltages, and that 0.5‑volt flare‑up is the kind of little ghost that haunts the specs. I remember a time when a tiny 4.5‑volt hiccup caused a whole batch of wrist‑watches to misbehave, so I keep a notebook of “forgotten spikes” – it's oddly satisfying to catch them before they crash the system.