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TIDA-010050: TIDA-010050: Choosing coils

Part Number: TIDA-010050
Other Parts Discussed in Thread: EVM430-FR6989,

Hi everyone,

I'm trying to make a desing with the ESI of EVM430-FR6989 with 2 sensors, and I don't know how to choose the coils correctly. I've read the documentation of TIDA-010050 and "Method to Select the Value of LC Sensor for MSP430 Extended Scan Interface (ESI)".

Our features are the following ones:

  1. Diameter of the semicircle: 12mm.
  2. Distance from the disk to the sensor: between 8-10mm.
  3. Sample rating: 50 Hz.

We need to use external coils instead of internals. I've seen on the case of d=4.2 mm, diameter of 11mm and sampling at 12 Hz, you used 235uH but the value of the capacitor doesn't appear and I don't know how to choose my values correctly.

Thank you in advance.

Best regards