LDC1614 Interference for cable

Hello na na,

by moving your hands close to the cable, you are changing its capacitance, which alters the oscillation frequency. Note that both inductance changes and capacitance changes shift the oscillation frequency which is measured by the LDC, and it may therefore be difficult to distinguish between the two effects.

Here are some things you could try:

1. Reducing cable length is obviously best, but I know it isn't always possible. Please make sure that long cables are securely attached (glued) to the housing of your system so that they don't bend during operation and cause a capacitance change.  

2. Are you using a shielded cable? I recommend UTP cable (unshielded twisted pair), as the shield has a lot of capacitance itself, which can be affected by the environment. 

3. Use a larger Csensor capacitor. By increasing the sensor capacitor, the cable capacitance will appear small by comparison, and its effect will be reduced.

Let me also add that the observed noise is 500 codes out of 19,000,000, or 0.0026%.

The main question is how does it compare vs your signal?