The previous scheme was RK3288 Android8+PN7150, and the credit card was normal. Now plan has changed. Abnormal credit card brushing with Qualcomm's QCM2150 Android10+PN7150 and abnormal credit card brushing with NFC TAGINFO APP have also been reported. I captured the LOG of the failed process of brushing with NFC TAGINFO. (See the attachment for abnormal video and LOG)
After exiting this APP the credit card will be tested by swiping. The credit card window can normally pop up and the card number can be read, but the M1 card cannot read the card number and will report an error. (See the attached test video)
Hello Aiko,
I think the issue will be RF-related. How did you make the impedance tuning? Can you share the smith diagram?
BR
Tomas