> The chip uses the 1-Wire protocol, which is a clever system for connecting low-speed devices through a single wire (plus ground). The 1-Wire system is conveni

> The chip uses the 1-Wire protocol, which is a clever system for connecting low-speed devices through a single wire (plus ground). The 1-Wire system is convenient here since the Mac can communicate with the Magsafe through the single adapter sense pin. http://www.righto.com/2013/06/teardown-and-exploration-of-magsafe.html http://www.righto.com/2013/06/teardown-and-exploration-of-ma... Magsafe 3 with USBC makes this even easier https://www.reddit.com/r/UsbCHardware/comments/11309f3/comment/j8oq05v/?utm_source=reddit&utm_medium=web2x&context=3 https://www.reddit.com/r/UsbCHardware/comments/11309f3/comme... The Lightning comms protocol is interesting too https://hackaday.com/2015/02/14/reverse-engineering-apples-lightning-connector/ https://hackaday.com/2015/02/14/reverse-engineering-apples-l...