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Spreadstrum SFCP
The SFCP protocol is a fast charging protocol launched by Spreadtrum chipmaker back in 2016, which can theoretically provide a variable voltage of 5V-20V. The protocol did not become popular and very few products support it. As an example Sharge 100W charger supports SFCP at 5V, 9V and 12V voltage levels
Additional information:
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Fast charging protocols and cable detection supported by USB testers
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USB power adapters(chargers) review and testing
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