hi,
Anyone out there has experience to connect I2C devices with diferent voltages, 3.3v and 5v respectively? I'm working on a project with MCU(3.3v) to control three devices, one is 3.3v, other two are 5v, I have trouble to get it work. my question are:
- can SCL and SDA be connected directly among those devices?
- should pull up resistors be connected to 3.3v or 5v?
- do I have to use voltage translator between 3.3v and 5v?
- should I use series resistors on SCL and SDA, should they be close to 5v devices or 3.3v devices?
thanks