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Reader loses access to NT3H2211 in pass-through mode

Question asked by Leon Wu on Apr 18, 2019
Latest reply on May 7, 2019 by Kan_Li

I'm using pass-through mode to transfer file via NFC. It works most of time. But from time to time the RF side can't access the NFC (not even able to read session register). I2C side still works as expected. The value of NC_REG is 0x7d (PTHRU_ON_OFF = 1, FD_OFF=11, FD_ON=11, TRANSFER_DIR=1,NFC_TO_I2C). NS_REG is 0x21 (RF_LOCKED=1, RF_FIELD_PRESENT=1). It can recover after detach and re-attach the reader. Is there anyway to recover it from NFC or I2C side. switching VCC off and on can't fix it.  Please help.