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FDC2114EVM: About specifications of FDC2114EVM

user6328993
Prodigy 50 points
Part Number: FDC2114EVM
Other Parts Discussed in Thread: FDC2114,

Dear TI


Here are my questions:

How much capacity does "C sensormax" have?

And, please tell me how to calculate the  "C sensormax".

  • 0
    TI__Expert 8920 points

    Hello,

    Thank you for posting.

    The maximum sensor capacitance for the FDC2114 is 250 nF with a 1 mH inductor and 10 kHz sensor oscillation frequency. This can be seen in section 8.5 of the FDC2114 datasheet.

    The following equation can be used to calculate sensor capacitance for other inductance and frequency values:

     

    Best regards,

    Nicole

  • 0 in reply to Nicole Khoury
    Prodigy 50 points

    Hi,  Nicole

    Thank you for your answer.

    FDC2114EVM has 18mH inductor and 33pF capacitor on the board.

    In the above case, how much capacity does "C sensormax" have?

    (With 10 kHz sensor oscillation frequency)

  • 0 in reply to user6328993
    TI__Expert 8920 points

    Hello,

    The FDC2114EVM has an 18µH inductor. As a result, the sensor capacitance is recommended to be around 33 pF, and this will allow the system to be more sensitive to shifts in capacitance. 

    Are you looking to change the 33 pF capacitor that is on the board? This is already the optimized value for the EVM.

    Best regards,

    Nicole