Hi,
So I am using an AD7150 (www.analog.com/media/en/technical-documentation/data-sheets/AD7150.pdf) to read values from a capacitor plate, the connections used for the sensor and AD7150 are shown in Fig. 1 of ftp://ftp.analog.com/pub/MicroConverter/CDC/AD7150/CN0095_Final_Approval.pdf.
I am using an Arduino Due.
Then I am connecting SDA to SDA1 and SCL to SCL1 both of them connected to a 3.3V supply with external pull-up resistors of 10k.
I do not know if it matters but the power supply for the slave is the master and for the master is a computer (to program it).
They both share the master's ground.
Thanks again