FDC1004EVM: Differential Sensing Configuration

Hi Bob,
That's unusual for the GUI to clear the settings. Let me test FDC1004EVM and get back to you.

Best Regards,
Bala Ravi

My goal is to find out the optimal register settings to do a differential measurement between CN1 and CN4.
I am trying to do this with the FDC1004EVM, as well as with my own hardware.

Hi Bob,
The GUI is clearing your selections (but that's how its supposed to work). If you would like to do a differential measurement between CIN1 and CIN4, go to the configurations page and for measurement 1, choose CHA as CIN1 and CHB as CIN4. When you hit take measurement, it will give you the sensor data on the right most column. If you would like a continuous measurement check that box and that should update the sensor data value continuously.

What you can't do is check all the measurement boxes and run the measurements. When you do this it will clear the check boxes and run only one measurement shown in the "Measure Channel". This is because FDC1004 measurements are sequential and not simultaneous (you can find this information in the datasheet).

If you prefer not using the GUI, you can setup a differential measurement by setting up an I2C communication with the device. You can find the register settings needed for a differential measurement in the datasheet.

I hope this helps!

Best Regards,
Bala Ravi