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FDC2214: Trace Length for LC Tank & Enveronmental Sensor

hideyuki sakai
Mastermind 6250 points
Part Number: FDC2214

Dear, Sir.

My customer is cobsidering to aplly FDC2214 for their system.

Now, they are asking about the trance length from FDC2214 input to LC tank & enveronmental sensor.

1. I suppose the trance length for both LC tank & enveronmental sensor should be short as well as

    possible to avoild the parasitic inductance. I wonder my understanding is corrent?

2. Regarding MCU, It is not needed to locate closing to FDC2214 because serial I/F(I2C) is used.

    I wonder my understanding is correct?

Best Regards,

H. Sakai

  • 0
    TI__Genius 17440 points

    Hello Sakai-san,

    1. Yes, we recommend placing the LC tank as close as possible to the INxA/INxB pins. This not only helps with parasitic effects from longer traces, it also helps make the system more resistant to EMI. The trace lengths should also be matched for the level sensor, environmental sensor, and reference liquid sensor. More layout recommendations can be found in section 12 of the datasheet.

    2. Correct, the FDC can be separated from the MCU. Keep in mind that the I2C bus has a maximum capacitance, so there is a finite distance that the ICs can be separated. 

    Best Regards,