Schematic of PN532 RFID/NFC Shield

[emtrion]

We have bought an PN532 NFC Shield since the NFC breakout board was not available from stock. Now we own the bord but have not got any documentation how to use it outside an Arduino stack.

The design seems to be different compared to the brealout board. We want to connect the board with an external microcontroller using the UART interface. By measuring we found that SEL0 must be open and SEL1 closed so that both configation bits become 0. But when we send a telegram to the PN532 we never get an acknowledge. Measuring showed that the signal lines SCL and SDA end at parts with SOT23 package and not at the PN532 as expected.

Can you please send as a schematic so that we are able to configure everything right for the UART interface?

Best regards,
Siegfried

[adafruit_support_bill]

The board files are here: https://github.com/adafruit/Adafruit-PN ... NFC-Shield

[ktownsend]

Please note that the SEL0 and SEL1 silkscreen labels are reversed on the current shields (SEL0 actually = SEL1 and vice versa). This will be fixed in the next run of the boards, and only affects people using this outside the normal use case, but it may confuse you in your case.