TRF7970A: Mifare Desfire EV1 EV2 EV3

Christoph50

Prodigy 220 points

Part Number: TRF7970A

Hi,

we are currently using the TRF7970A + a M0+ controller as RFID Reader for ISO15693 Tags.

would it be possible to realize a MIFARE DESFIRE EV1, EV2 and EV3 reader with the TRF7970A?

Thanks a lot

chris

over 3 years ago

0 Helfried Vollbrecht over 3 years ago

TI__Mastermind 18265 points

Hello Christoph,

I am not a specialist for the Mifare products but there is literature which describes the use of the TRF7970A for the EV1. If there are differences when using the EV2 or EV3 I cannot answer.

As long as standard ISO14443A commands are used, the TRF7970A can handle that. When it comes to the authentication process the so called "Direct Mode0" has to be used, which means the processor has to handle the protocol at bitlevel. This is also timing critical.

I can provide you literature for better understanding the use of the TRF7970A with Mifare cards:

Using Special Direct Mode With the TRF7970A

https://www.ti.com/lit/pdf/sloa214

MIFARE DESFire EV1 AES Authentication With TRF7970A

https://www.ti.com/lit/pdf/sloa213

8372.7127.Mifare Classic Deep Dive Training.pdf

I am not aware of a firmware example for the M0+. The examples provided are for the MSP430 and have to be adapted to your needs.

Additional information can also be found by a search in this forum.

Best regards,

Helfried

0 BO over 3 years ago

TI__Genius 12760 points

Hi Chris,

please see

• TRF7970A: Detecting MIFARE DESFire EV2 cards

• MIFARE DESFire EV1 AES Authentication With TRF7970A

• TIDM-NFC-DESFIRE-AES Near Field Communication (NFC) MIFARE DESFire EV1 Tag Authentication Reference Design

Regards Bernd