Recently I made a impedance measurement system using ad5933, however I failed to made it work correctly. The chip can only give out a DC output value on Vout, not a sin signal. At the same time the IIC communication part also has some mistakes, I wish to use a Arduino to control the chip by IIC, but it only got zero values back to the PC port. Please help me, thanks!
The circuit plot is here.
I found U2B is not connected at a right way, then I change the circuit into the following form,
The connector REF is used for different measurement ranges. The code is uploaded on the link.