The PN7220 and PN7221 are fully pin-to-pin compatible. From the HW point of view, it is the same IC. The different between PN7220 and PN7221 is that the PN7221 supports "Apple Enhanced Contactless Polling" feature.
One more small question, are PN7220 and PN7221 fully pin-to-pin compatible? I couldn't find the Hardware Design Guide document for the PN7220 IC from the link below, is there no such document?
The PN7220 and PN7221 are fully pin-to-pin compatible. From the HW point of view, it is the same IC. The different between PN7220 and PN7221 is that the PN7221 supports "Apple Enhanced Contactless Polling" feature.