I've finally plunged and been having lots of fun learning TWI/I2C with my AVR. I've got RTC and EEPROM both working great through TWI.
Next I'd like to make a complex circuit that actually monitors something, and saves the value into EEPROM.
So I wanted to make a data logger I can run off batteries efficiently.
I want to make a circuit that uses 2 TWI slaves that are always powered but 3 TWI slaves that I'd only power every 5 min.
I was thinking I would have the 3 TWI slaves flipped on or off through a mosfet on their VCC line. Then I remember someone mentioning that the ICs might try to power themselves through the TWI lines. Is this something I have to worry about? If so what are real alternatives or is it a bad idea what I want to do all together?