FDC2214: Fdc2214 base capacitance measurement

Hello, 

We have collateral around the FDC1004 for doing capacitive liquid level sensing but if you know your sensor's capacitive range will vary from 0-450pF, then the FDC1004 will not work. You can still follow similar process using the FDC2214. One of the key differences between these parts is the active shield that the FDC1004 includes. This shield helps shield the sensors from external impacts like noise. Here is a list of collateral that may be helpful for your application: 

• Capacitive sensing: which architecture should you choose?
• How to Calibrate FDC1004 for Liquid Level Sensing Applications
• Capacitive Sensing: Direct vs Remote Liquid Level Sensing Performance Analysis (Rev. A)
• Capacitive Sensing: Ins and Outs of Active Shielding (Rev. A)
• Capacitive Sensing: Out-of-Phase Liquid Level Technique

Best Regards, 

Justin Beigel

I am still worried as I am looking for technical clearance for 0-450pf range. Solution which you are suggesting is having major issue as noise will create more variation. Send me some near by application which I can refer 

Hello, 

Is your 0-450pF range a fixed component of your design? Can you share any details on your sensor design? 

We don't have any examples that cover this large of a range. With this much capacitive shift it would be important to double check that the sensor frequency range for this target shift stays within the bounds of the FDC2214's supported sensor frequencies. 

Best Regards, 

Justin Beigel

If I get reference case study I will go through it and come back with query. But important is can I use this chip for my product development kindly suggest as it is slight urgent as we are running out of time. Sorry for pushing but need your thought urgently.