• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 16 subscribers
  • Views 690 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TRF7970A Card Emulation of a Mifare Ultralight

Joerg Klausmann
Prodigy 10 points
Other Parts Discussed in Thread: TRF7970A

Hi,

I'am using the TRF7970 to emulate a Mifare Ultrlight card.

Everything works well, only the sending of the ACK (0xA) after receiving a write command from the reader is not working.

I think the problem is, that this command is only 4bit.

So is it possible to "send" broken bytes in card emulation mode?

p.s. I have already try to change the settings like we do it on the reader side, to enable the broken bytes mode (for example sending REQA)

  • 0
    TI__Guru*** 135355 points

    Hi Joerg,

    The TRF7970A does not emulate Type 2 tags and cannot send the 4 bit ACK command naturally. Theoretically you could use Direct Mode 0 or maybe even Special Direct Mode to do this, but we have no example code to support the sending of the Type 2 ACK and have no plans to make such an example at this time.