Other Parts Discussed in Thread: TRF7970A, TRF7964A
Customer have a new E-lock project, EAU is about 100K.
They used TRF7970A before, for cost concern they need to change to TRF7963A.
They are using DESFire card with AES key in the project, and they have been developing the firmware on TRF7970A. Everything works well on TRF7970A now. However, after porting the firmware to the TRF7963A, it fails to authenticate the same DESFire card 5-7 attempts out of 10. This problem doesn't happen on the PCBA with TRF7970A soldered.
Can you shed some light on this?