Comment on If you own an M2 MacBook Air or MacBook Pro there’s an update for your cableparentComments−duskwuff3yUSB PD negotiation.The MagSafe connector only has three distinct contacts (there are five pins, but it's mirrored), so there has to be some protocol translation between USB PD and the single control signal used in MagSafe.
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USB PD negotiation.
The MagSafe connector only has three distinct contacts (there are five pins, but it's mirrored), so there has to be some protocol translation between USB PD and the single control signal used in MagSafe.