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Problem Reading Mifare cards on PN532 Customized board.

Question asked by Anmol Kohli on Jul 13, 2019
Latest reply on Jul 19, 2019 by IvanRuiz

antenna pn532 NXP 

I have customized my own PN532 board.

1. For first assembly the board was working some time and some time it did not.(was getting i2c address , card read some time and other time it did not read the i2c address).without ground tap in antenna 

 

2. Second time same board i assembled i am able to read i2c every time. but it is not able to read any card.

      i tried nfc energy harvesting ic so without ground tap on antenna it showed no power, led glowed very less. then i ground tapped antenna so i was able to get full glow on LED on board energy harvesting ic. but still not able to read cards.

 

attaching the Schematic and board image

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