We are using the PN532 NFC reader in I2C mode. We are using the Adafruit PN532 library and have tried using inListPassiveTarget and readPassiveTargetID functions. We see that the RF Field is ON. However, the IRQ pin isnt being put on LOW by the PN532 even when a card is present and hence we are unable to read anything. Do you have inputs on what may be the issue?