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PN7150:Can't read NFC card

Question asked by Bob Zhang on Jul 29, 2019
Latest reply on Jul 31, 2019 by vicentegomez

We test the waveform at feedpoint of antenna. And find the frequency of the waveform jump up and down. It is much lower than 13.56MHz. What kind of problem for this,software or antenna matching? We use a android main board connecting to NFC board,and the main board can find NFC boad.