What are the 27.12MHz crystal specification for the ST25R3916? The evaluation kit uses Murata XRCGB27M120F3M00R0, which is 30ppm tolerance, 40ppm stability, 6pF load capacitance. Can we use a 100ppm tolerance version, XRCGB27M120F0Z00R0?

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ST Employee

Hello,

the crystal tolerance is mainly given by the standard you want to comply with.

For ISO14443 it is stated: "The frequency fc of the RF operating field shall be 13,56 MHz ±7 kHz.".

Which means your crystal frequency drift should not be more then +/-7kHz in total.

BR Travis

ST Employee

Hello,

the crystal tolerance is mainly given by the standard you want to comply with.

For ISO14443 it is stated: "The frequency fc of the RF operating field shall be 13,56 MHz ±7 kHz.".

Which means your crystal frequency drift should not be more then +/-7kHz in total.

BR Travis

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