I2C can also be powered on by bus!

    What an unexpected discovery , I've only heard of the way that a single bus takes power from the bus . It's only now that , original 24CXX You can also get power from the bus .
     This discovery was made once I2C Found in the design of bus copying machine . Originally designed a power control , During debugging, it is found that the power supply can still be read and written normally . Later, just use three pins :GND、SCL、SDA. That is, only ground wire 、 Clock line and data line , Unexpectedly, the access is completely normal ！
     I think , Is it because the manufacturer adopted the bus power supply mode in the new design . Expect professionals to give a professional explanation .