SLOA208B November 2014 – March 2019 TRF7970A , TRF7970A
Within NDEF applications, three different file types exist:
The CC File is required within each NDEF application. The CC file includes the file IDs for the other files within the application as well as information such as the read/write privileges and maximum file size.
The NDEF file is required for all NDEF applications. There can only be one NDEF file, and it must have a specific file ID that is in accordance with NFC Forum specifications. The NDEF file is optional for proprietary applications, but any proprietary application that does not use an NDEF file does not conform to the NFC Forum specifications.
The proprietary files are optional, and they are used in proprietary applications to do specific functions that do not meet the normal NDEF specifications.
The amount of data contained within the files cannot exceed 64kB, and typically the limit is lower than that due to the memory constraints of the hardware (the MCU memory).