I have two questions.
(1) Regarding an external crystal oscillator.
For the ST25R3916B, is it necessary to have an external 27.12MHz crystal between XTI and XTO? Also, are there any points to note when selecting a crystal?
(2) Regarding the design of the antenna matching circuit.
I am trying to design a matching circuit using the NFC/RFID Calculators following the method in the AN5276 Application note. How should I decide the values to enter in the "Matching inputs section" and "Inputs section" of the NFC/RFID Calculators?
